São Paulo, February 22, 2021 - ISA CTEEP - Companhia de Transmissão de Energia Elétrica Paulista (“ISA CTEEP”, “Company”, B3: TRPL3 and TRPL4), announces its results for the fourth quarter (4Q20) and fiscal year 2020. Regulatory results are shown in accordance with the Electricity Sector Accounting Manual (MCSE) to facilitate understanding of the Company’s business. Moreover, the information has been prepared in accordance with standards established by the Securities and Exchange Commission of Brazil (CVM), announcements by the Accounting Statements Committee (CPCS) and the International Financial Reporting Standards (IFRS) issued by the International Accounting Standards Board (IASB) in the “Attachments” section of this document.

Main Regulatory Consolidated Indicators Chg (BRL million) 4Q20 4Q19 Chg (%) 2020 2019 (%) Net Revenue 839.0 729.5 15.0% 3,891.2 2,774.6 40.2% EBITDA 634.8 596.1 6.5% 3,416.6 2,184.0 56.4% Adjusted EBITDA¹ 723.1 595.1 21.5% 2,716.3 2,213.5 22.7% Adjusted EBITDA Margin² 79.3% 81.6% (2.3) p.p. 85.8% 79.8% 6.0 p.p. Net Income3 374.4 345.4 8.4% 2,002.4 1,221.8 63.9% Net Margin 44.6% 47.3% (2.7) p.p. 51.5% 44.0% 7.4 p.p. ROE (amount value of 25.8% 18.2% 7.6 p.p. 25.8% 18.2% 7.6 p.p. LTM)

¹Adjusted by receipt of Adjusted Parcel (PA) (RTP and RBSE) excluding provision and non-recurring effects 2Considers net revenue adjusted by receipt of PA (RTP and RBSE) 3 Adjusted by non-controlling interest

STRONG CASH GENERATION DRIVES GROWTH STRATEGY AND DISTRIBUTION OF EARNINGS

ISA CTEEP’s mission is to create sustainable value for its stakeholders. We do this in all of our daily tasks and through social and environmental programs that ensure the company’s longevity while creating value for our investors. Last year was an atypical year. When we narrate the story of 2020 to future generations, we will highlight the challenges brought on by the global pandemic. Aware of the significance of the essential service we provide – access to electricity – we put into practice a special plan designed to ensure business continuity. We reduced the number of employees at our facilities substantially and activated the second operations center to ensure that load transmissions in our grid are fully functioning. In some locations, we set up camps to avoid travel and reduce the risk of contagion. The progress made in our digital transformation journey until then was essential for us to quickly adopt remote work for all activities where physical presence was not essential. The year was also notable for the adoption of several measures focused on the culture of occupational safety, especially in our production chain. We employed constant efforts and investments to protect both our own and outsourced employees. Unfortunately, despite all these safety protocols in place, one employee passed away during the period. We reviewed and reinforced the procedures to systematically consolidate our values in our relations with stakeholders. In line with our commitment to social and environmental development, through the Conexão Jaguar Program, we reaffirmed our support to the Homem Pantaneiro Institute in preserving over 76,000 hectares in the Serra do Amolar region in the Pantanal biome, which was scorched by fires in 2020. In addition to the efforts under the Program, we acquired a vessel to help deploy firefighters to put out fires.

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Even during such an atypical year with so many challenges, we delivered record results based on operational excellence and solid financial management. We posted net revenue of BRL3.9 billion in the year which, coupled with our cost discipline, enabled us to post adjusted EBITDA margin of 86% and net income of BRL2.0 billion. This result gave an impetus to our strategy focused on growth combined with the generation of sustainable value and enabled us to distribute earnings of BRL1.67 billion, which represents dividend yield of 9%. On the regulatory front, we defined the methodology and application of the Periodic Tariff Review for renewed agreements and started receiving remuneration of the financial component of the Basic Network of Existing System (RBSE) at the cost of equity, which had a positive impact of BRL969.0 million in the year’s combined regulatory results. We made significant progress in our growth strategy. We started up two projects – Interligações Elétricas Itaquerê and Tibagi –, concluded our first real estate deal, won the second biggest lot in transmission auction 001/2020 held by the Brazilian Electricity Regulatory Agency (ANEEL), with projected investments of BRL1.1 billion, and signed an agreement to acquire the Piratininga Bandeirantes Line for BRL1.6 billion, which will add RAP of BRL172 million (2020/21 cycle). We also forged ahead in our modernization plan, with investments in retrofitting projects up 73.6% over the previous year. We donated BRL5 million to initiatives aimed at fighting the pandemic as a way of sharing our accomplishments with society. Both the company and the employees donated funds to ramp up the production of rapid tests in partnership with Fiocruz, to aid the construction of a Multipurpose Vaccine Production Center at the Butantan Institute and to support the “Saving Lives” match funding campaign launched by the Brazilian development bank (BNDES). We have a very clear vision of our role, backed by an excellent technical team and solid, responsible management, which are crucial factors for sustainable business development. We continue to monitor the pandemic scenario unfolding in Brazil in order to maintain all the measures required to ensure business continuity and the safety of our teams – whose efforts I am deeply grateful to – which were not only essential for us to face the challenges during the year, but also motivate us to always go beyond.

Rui Chammas Chief Executive Officer

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CONTENTS

1. ISA CTEEP 1.1 ISA CTEEP 5 1.2 Shareholding Structure 6 1.3 Corporate Structure 7 1.4 Growth 7

2. Operational Performance 8

3. Financial Performance 3.1 Operating Revenue 9 3.2 O&M Costs and Expenses 10 3.3 Equity Income 10 3.4 EBITDA and Margin 12 3.5 Financial Result 13 3.6 Other Operating Income 14 3.7 Net Income 14 3.8 Comparison of Results (Regulatory vs. IFRS) 15

4. Debt 16

5. Proceeds 18

6. Capex 18

7. Sustainabiity 21

8. Capital Market 22

9. Events during the Period 24

10. Subsequent Events 25

11. Upcoming Events 27

12. Other Relevant Information 27

12. Glossary 32

13. Attachaments 35 * Results in Excel spreadsheet available on the Investor Relations Website

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ISA CTEEP ISA CTEEP is Brazil’s largest private electricity transmission company. Through its operations and those of its subsidiaries and affiliate companies, the Company is present in 17 states across Brazil (Rio Grande do Sul, Santa Catarina, Paraná, São Paulo, Minas Gerais, Rondônia, Mato Grosso, Mato Grosso do Sul, Goiás, Tocantins, Maranhão, Piauí, Paraíba, Pernambuco, Alagoas, Espírito Santo and Bahia), and supplies approximately 33% of all electricity transmitted through the National Interconnected System (SIN). The coordination and control of the operations of the Company’s installations and the entire electricity generation and transmission infrastructure in the SIN are the responsibility of the National Electricity System Operator (“ONS”), subject to inspection and regulations established by ANEEL. On December 31, 2020, the installed capacity of the company (parent company, wholly-owned subsidiaries and non- consolidated subsidiaries¹ in operation) totaled 67,600 MVA in transformation, 18,600 kilometers of transmission lines, 25,900 kilometers of circuits and 127 own substations. To efficiently operate our complex transmission system, we rely on a team of around 1,400 employees and facilities that ensure quality and reliable service. We are committed to the development of the country’s energy infrastructure and constantly invest on modernizing our network and contributing directly to the expansion of the national transmission system. In the last four years, the Company won the bids for 14 lots in the transmission auctions conducted by ANEEL.

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Shareholding Structure ISA CTEEP is controlled by ISA, a multi-Latin linear infrastructure systems company.

TRPL3 TRPL4 Shareholders % % Total % (Common) (Preferred) ISA Capital do 230,856,832 89.50% 5,144,528 1.28% 236,001,360 35.82% Brasil Management 0 0.00% 4,900 0.00% 4,900 0.00%

Free Float 27,080,900 10.50% 395,796,144 98.72% 422,877,044 64.18%

Eletrobras 25,158,644 9.75% 212,276,657 52.94% 237,435,301 36.04%

Others 1,922,256 0.75% 183,519,487 45.78% 185,441,743 28.14%

Total 257,937,732 100% 400,945,572 100% 658,883,304 100%

Date: 12/31/2020

Total Capital Distribution on 12/31/2020

* Includes the interest held by “Isa Capital do Brasil”, the investment vehicle of ISA Colombia for the acquisition of ISA CTEEP. ** 1% of free float is dispersed in other regions

Excluding the interest held by Eletrobras and ISA, on December 31, 2020, 45% of the shareholder base consisted of foreign investors (26% North America, 16% Europe, 2% Asia and 1% Oceania) and 55% Brazilian investors.

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Corporate Structure ISA CTEEP’s corporate structure includes its wholly-owned and non-consolidated subsidiaries¹: RAP Cycle RAP ISA CTEEP Location 2020/2021¹ Cycle 2020/2021 Profit Regime² Share (%) Consolidation (BRL million) (BRL million) ISA CTEEP Operational São Paulo 3,131 3,131 Real Profit ISA CTEEP 100% Fully consolidated IE Madeira Operational Rondônia / SP 552 281 Real Profit ISA CTEEP 51% / Furnas 24.5% / Chesf 24.5% Equity method IE Ivaí Under construction Paraná 300 150 Real Profit ISA CTEEP 50% / TAESA 50% Equity method IE Paraguaçu Under construction Bahia / MG 121 61 Real Profit ISA CTEEP 50% / TAESA 50% Equity method IE Garanhuns Operational Pernambuco 95 48 Real Profit ISA CTEEP 51% / Chesf 49% Equity method IE Aimorés Under construction Minas Gerais 81 40,5 Real Profit ISA CTEEP 50% / TAESA 50% Equity method IE Pinheiros Operational São Paulo 63 63 Presumed Profit ISA CTEEP 100% Fully consolidated IE Aguapeí Under construction São Paulo 60 60 Presumed Profit ISA CTEEP 100% Fully consolidated IE Serra do Japi Operational São Paulo 56 56 Presumed Profit ISA CTEEP 100% Fully consolidated IE Itaúnas Under construction Espírito Santo 53 53 Presumed Profit ISA CTEEP 100% Fully consolidated IENNE Operational Tocantins 53 53 Presumed Profit ISA CTEEP 100% Fully consolidated IE Itaquerê Operational São Paulo 52 52 Presumed Profit ISA CTEEP 100% Fully consolidated Operational Minas Gerais 20 20 IEMG Presumed Profit ISA CTEEP 100% Fully consolidated Under construction Minas Gerais 33 33 Operational Espírito Santo 13 13 Evrecy Presumed Profit ISA CTEEP 100% Fully consolidated Under construction Rio Grande do Sul 38 38 IE Biguaçu Under construction Santa Catarina 41 41 Presumed Profit ISA CTEEP 100% Fully consolidated SP / Paraná³ 21 21 IE Tibagi Under construction Presumed Profit ISA CTEEP 100% Fully consolidated Mato Grosso do Sul / SP 5 5 Operational São Paulo (Bauru) 12 12 IE Itapura Presumed Profit ISA CTEEP 100% Fully consolidated Under construction São Paulo (Lorena) 11 11 IE Sul Operational Rio Grande do Sul 20 20 Presumed Profit ISA CTEEP 100% Fully consolidated IE Riacho Grande Under construction São Paulo 68 68 Presumed Profit ISA CTEEP 100% Fully consolidated Total 4,898 4,331

¹ 2020/2021 revenue cycle includes adjustment parcel (“PA”), net of PIS and COFINS ² Presumed Profit: tax regime where the income tax is 25% on the presumed 8% of operating income. Social Contribution tax is 9% on the presumed 12% of operating income. Real Profit: 34% of Income Tax + Social Contribution on calculated taxable income ³IE Tibagi’s RAP does not consider adjustments arising from the contractual amendment (-13.5%), approved by the Board of ANEEL on 10/26/20

Growth

ISA CTEEP’s history is marked by solid growth with sustainable value creation:

¹ ISA CTEEP 51% ² ISA CTEEP 50% / TAESA 50% ³ Consummation of the transaction is subject to the fulfillment of certain conditions precedent

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ISA CTEEP constantly evaluates growth opportunities in the market and has been making progress in this regard. Its strategy is to expand its footprint across Brazil through auctions and/or acquisitions that bring synergies with existing operations, while respecting the premise of sustainable value generation. Since 2016, the Company has won the bids for 14 lots in the transmission auctions conducted by ANEEL, for which ANEEL’s capex (weighted by ISA CTEEP’s interested) totaled BRL6.3 billion, with an increase in RAP (2020/2021 cycle) of around BRL645 million after the assets go operational. Until December 31, 2020, about BRL2 billion had been invested in these projects. The Company has already energized four of these projects at an average capex efficiency of 36% and 11 months in advance on average, as shown below:

ANEEL’s¹ Investment Investment Made Efficiency Advance Participation ISA CTEEP (BRL million) (%) (months) (BRL milion) Itapura Bauru 63 126 -50% -18 Itaquerê 250 398 -40% -11 Tibagi 118 135 -12% -8 Aguapeí 360 602 -43% -6 Average -36% -11

¹ Amounts on auction date Another important growth avenue is the investments made in retrofitting projects. In the last eight years, the Company invested an average of about BRL220 million/year, with associated average RAP of around BRL45 million/year. Note that these are average amounts and investments may be non-linear as they depend on ANEEL’s authorizations. The Company has authorizations to invest over BRL1.5 billion on retrofitting projects over the coming years. The Capex section and Attachment 1 provide more details about growth projects.

OPERATIONAL PERFORMANCE ISA CTEEP is an industry benchmark in performance. The Company constantly manages its operating indicators meticulously, notably the Index of Non-Supplied Energy (IENS), which is the ratio of total energy not supplied during incidents throughout the year to the total energy demanded that the Company did in fact supply. In 4Q20, the Company’s IENS was 2.81 x 10-6, compared to 6.95 x 10-6 in 4Q19. IENS in 2020 was 5.4 x 10-6 (vs. 8.0 x 10- 6 in 2019). For SIN, IENS in the last 12 months ended November 2020 was 36 x 10-6. ISA CTEEP is remunerated through the RAP according to the uptime of its assets. This means that any downtime of its assets may incur a loss of RAP through a deduction in verified revenue (Variable Parcel – PV). In 4Q20, the PV applied was 1.15% of the border and transmission basic network RAP. In 2020, this ratio stood at 1.26%.

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FINANCIAL PERFORMANCE (Regulatory Results)

Operating Revenue

In 4Q20, consolidated gross operating revenues were BRL989.4 million (+BRL136.9 million vs. 4Q19). This result is explained by (i) the positive impact of the 2020/2021 RAP cycle, which considers the positive variation of IPCA and the impacts from the application of the Tariff Review; (ii) the receipt of remuneration from RBSE’s financial component at Ke starting from 3Q20; and (iii) the operational startup of retrofitting and greenfield projects energized in 4Q20. In 2020, consolidated gross operating revenues were BRL4,497.5 million (+BRL1.2 billion vs. 2019). This increase is explained by the PA related to the RBSE, the retroactive application of RTP of agreement 059 and the above-mentioned events in 4Q20. The PA (RTP and RBSE) will be received in three years, from July 2020 to 2023.

Operational Revenue Consolidated (BRL million) 4Q20 4Q19 Chg (%) 2020 2021 Chg (%) Eletric Network Revenue 970.7 844.8 14.9% 4,451.9 3,217.4 38.4% RBSE 493.7 415.5 18.8% 1,818.3 1,624.8 11.9% 059 Contract 204.7 218.5 -6.3% 847.5 857.2 -1.1% CAAE ------O&M 204.7 218.5 -6.3% 847.5 857.2 -1.1% Retrofitting Projects (059 107.8 103.8 3.9% 426.0 390.9 9.0% Contract) CAAE 93 91.1 2.1% 370.8 342.1 8.4% O&M 14.8 12.7 16.5% 55.2 48.8 13.1% Bidding Contracts 60.7 48.9 24.1% 212.0 190.2 11.5% CAAE 51.9 42 23.6% 180.4 164.4 9.7% O&M 8.8 6.9 27.5% 31.6 25.8 22.5% PA, PV and Anticipation 43.5 10.9 299.1% 961.8 -22.0 -4471.8% PA (RBSE and RTP) - - - 969.4 - n.a. Other PA, PV and Anticipation 43.5 10.9 299.1% -7.6 -22 -65.5% Regulatory charges 60.3 47.2 27.8% 186.3 176.3 5.7% Others 18.6 7.8 138.5% 45.5 31.8 43.1% Gross Revenue 989.4 852.5 16.1% 4,497.5 3,249.3 38.4% Deduction -150.4 -123.0 22.3% -606.3 -474.8 27.7% Net Revenue 839.0 729.5 15.0% 3,891.2 2,774.5 40.2% Deductions from gross revenue are related to taxes (PIS/COFINS) and regulatory charges (CDE, RGR, R&D, PROINFA, and Inspection Fee), which are transferred to the tariff (gross up). Deductions totaled BRL150.4 million in 4Q20, up 22.2% from 4Q19. Deductions in 2020 totaled BRL606.3 million, up 27.7% from the prior year, due to (i) PIS and COFINS on the PA of RTP and Ke; and (ii) the increased revenue from CDE charges, resulting from the year-on-year growth in consumption among free market clients. Note that this effect is neutralized when this amount is transferred to the Electric Energy Trading Chamber (“CCEE”) through deductions. As such, net revenue totaled BRL839.0 million in 4Q20 and BRL3,891.2 million in 2020.

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O&M Costs and Expenses

O&M Costs and Expenses Consolidated (BRL million) 4Q20 4Q19 Var (%) 2020 2019 Var (%) Personnel -96.9 -79.8 21.4% -326.6 -336.5 -2.9% Material -6.3 -3.4 85.4% -16.0 -14.1 13.8% Services -40.9 -40.9 0.0% -128.6 -139.8 -8.0% Others -25.5 -25.4 0.3% -78.4 -74.3 5.5% PMSO (ex non-recurring) -169.6 -149.5 13.4% -549.6 -564.7 -2.7% Non-recurring -15.7 1.0 n.a. -25.6 -29.5 -13.3% Growth projects -10.8 - - -10.9 - - Covid-19 -4.9 - - -7.0 - - Legal fees - 5.6 - - -21.3 - Others - -4.6 - -7.7 -8.2 - PMSO -185.3 -148.5 24.8% -575.2 -594.2 -3.2% Contingences -9.0 15.6 n.a. -12.3 11.0 -212.0% O&M Costs and Expenses -194.2 -132.9 46.1% -587.5 -583.2 0.7% Depreciation -141.7 -141.1 0.4% -562.3 -575.6 -2.3% Total -336.0 -274.0 22.6% -1149.8 -1158.8 -0.8%

O&M costs and expenses (PMSO), excluding non-recurring effects totaled BRL169.6 million in 4Q20 (+13.4% vs. 4Q19) and BRL549.6 million in 2020, down 2.7% from 2019. This result is due to: (i) the 2.9% reduction in personnel expenses in 2020, lower than inflation during the period (+4.5% IPCA); (ii) the increase in materials line, mainly due to the acquisition of materials and supplies for the operational teams in response to COVID-19; (iii) the decrease in services line, mainly due to lower expenses with services related to travel, events and training; (iv) the increase in others, mainly due to land indemnification and software licensing costs. PMSO totaled BRL 185.3 million in 4Q20 (+24.8% vs. 4Q19) and BRL 575.2 million in 2020, down 3.2% from 2019. Contingencies amounted to an expense of BRL9 million in 4Q20 and an expense of BRL12.3 million in 2020, due to the changes in forecasts over the course of the year. In 4Q19, there was a reversal of BRL15.6 million mainly due to labor lawsuits. O&M costs and expenses, excluding depreciation, totaled BRL194.2 million in 4Q20 and BRL587.5 million in the year. The Company is focused on financial discipline to neutralize the effect of inflation on costs and expenses.

Equity Income Equity income was a negative BRL32.9 million in 4Q20, versus an income of BRL26.5 million in 4Q19. In 2020, equity income was a negative BRL60.4 million, versus an income of BRL69.9 million in 2019. IE Madeira registered a loss of BRL28.9 million in 4Q20 and BRL38.9 million in 2020, due to the recognition of the provision related to arbitration proceedings, partially offset by better operating results and cost discipline, with full receipt of RAP since September 2019. 10

IE Garanhuns reported income of BRL6.0 million in 4Q20 and BRL21.0 million in 2020, driven by EBITDA growth and better financial results. At the pre-operating subsidiaries, both variations are mainly caused by expenses with regulatory charges and inflation adjustment on the issue of debentures of IE Ivaí for project funding.

Equity Income Results (BRL million)

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EBITDA and Margin Consolidated EBITDA Chg (BRL million) 4Q20 4Q19 2020 2019 Chg (%) (%) Net income 839.0 729.5 15.0% 3,891.2 2,774.6 40.2% Costs and expenses (ex-depreciation) (194.2) (132.8) 46.2% (587.6) (583.2) 0.8% Other expenses and operational revenues (ex- (10.0) (0.5) 1793.4% 113.0 (7.4) -1636.0% amortization)

EBITDA 634.8 596.1 56.4% 6.5% 3,416.6 2,184.0 PA (RTP and RBSE) - - n.a. (871.1) - n.a. Receipt of PA retroactive (RTP and RBSE) 72.6 - n.a. 145.2 - n.a. Non-recurring costs and expenses¹ 15.7 (1.0) n.a. 25.6 29.5 -13.3%

Adjusted EBITDA 723.1 595.1 22.7% 21.5% 2,716.3 2,213.5

Adjusted Revenue² 911.6 729.5 3,165.3 2,774.6 25.0% 14.1% Adjusted EBITDA Margin 79.3% 81.6% (2.3) p.p 85.8% 79.8% 6.0 p.p ¹Considers non-recurring expenses with growth projects, notice of violation and lawyers’ fees ²Considers net revenue adjusted by PA (RTP and RBSE)

EBITDA totaled BRL634.8 million in 4Q20, up 6.5% from 4Q19. In 2020, EBITDA was BRL3,416.3 million, up 56.4% from 2019. These results are mainly due to the following factors: (i) accounting of retroactive RTP (2018-2020) and remuneration of the financial component of RBSE by Ke from 2017 to 2020, made in 2Q20 with an addition in 3Q20 – PA (RTP and RBSE); (ii) effect of tariff adjustment; and (iii) operating costs and expenses remained stable in the year. To reflect the operating cash generation, the Company reports Adjusted EBITDA, which totaled BRL723.1 million in 4Q20, an increase of 21.5% from 4Q19. In 2020, Adjusted EBITDA totaled BRL2,716.3 million, up 22.7% from 2019. The adjustment considers the amount received from PA (RTP and RBSE) in the period and excludes the provision, and also excludes the non-recurring effects to present a clearer vision of the Company's operational cash generation. PA (RTP and RBSE) of BRL871.1 million will be received in 3 years (from July 2020 to 2023). EBITDA from ISA CTEEP’s interest in the non-consolidated subsidiaries IE Madeira and IE Garanhuns totaled BRL60.3 million and BRL10.8 million in 4Q20, respectively. In 2020, IE Madeira’s EBITDA was BRL246.4 million and IE Garanhuns’ EBITDA totaled BRL40.4 million. Accordingly, Adjusted EBITDA including Madeira and Garanhuns was BRL794.2 million in the quarter (+19% vs. 4Q19) and BRL3,003.2 million in 2020 (+22% vs. 2019).

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Adjusted EBITDA (BRL million)

¹ IE Madeira and IE Garanhuns

Financial Result Consolidated financial result was an expense of BRL80.3 million in 4Q20, BRL33.4 million higher than in 4Q19. In 2020, the financial result was an expense of BRL208.1 million, BRL22.0 million higher than in 2019. These results were due to fresh funding operations (9th issue of debentures, CCB and BNDES payments) and lower return from financial investments caused by the drop in the CDI rate.

Financial Result Consolidated (BRL million) 4Q20 4Q19 Chg(%) 2020 2019 Chg(%) Financial Income 10.0 116.9 -91.4% 370.3 436.1 -15.1% Financial investment income 8.3 13.1 -36.6% 49.2 65.7 -25.1% Hedge 0.3 103.4 -99.7% 304.3 360.9 -15.7% Others 1.5 0.5 196.6% 16.8 9.4 79.1% Financial Expenses (90.4) (163.9) -44.9% (578.4) (622.1) -7.0% Interest and charges on loans (47.0) (36.2) 29.8% (169.6) (147.6) 14.9% Hedge 0.1 (110.8) -100.1% (315.2) (406.5) -22.5% Others (43.5) (16.9) 158.1% (93.6) (67.9) 37.8%

Total (80.3) (47.0) 71.0% (208.1) (186.0) 11.8%

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Other Operating Revenue / Expenses Expenses totaled BRL10.6 million in 4Q20, while income in 2020 came to BRL110.6 million, chiefly due to the gain from the real estate operation booked in 2Q20.

Net Income¹

Net income in 4Q20 was BRL374.4 million, up 8.4% from 4Q19. The better operating result and lower income tax and social contribution due to the tax benefit on the payment of interest on equity positively affected the period’s results. In 2020, net income was basically driven by the improvement in EBITDA and the gain from real estate operations.

Net Income (BRL million)

¹Adjusted by non-controlling interest

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Comparison of Results (Regulatory vs. IFRS)

On December 1, 2020, the CVM sent Letter 04/2020 with guidelines regarding the relevant points of IFRS 15 (CPC 47) and IFRS 9 (CPC 48) to be complied with in the financial statements of December 31, 2020.

Based on these new guidelines, the Company revised its accounting practices, which resulted in a total positive impact of BRL674 million:

(i) The Company recognizes profit margin during the construction phase of the works and not only at the time of operational startup. This margin will be reviewed annually.

(ii) The rate applied to the contractual asset reflects the implicit rate of the financial flow of each project and considers the Company's estimates to price the financial component according to the macroeconomic characteristics together with the methodology used by the Concession Authority and the individual cost structure of projects

(iii) RBSE is now classified as a contractual asset and not a financial asset.

The main variations between the consolidated result through IFRS and regulatory standards in 4Q20 and 2020 are shown below:

Consolidated DRE (BRL million) IFRS Regulatory IFRS Regulatory Change Change IFRS vs. Regulatory 4Q20 4Q20 2020 2020 Gross Revenue 382 989 -607 4,241 4,497 -256 O&M Revenue¹ 332 332 0 1,113 1,113 0 CAAE Revenue (Annual Cost of Electric Assets)² 0 145 -145 0 551 -551 RBSE Revenue -984 494 -1,478 1,041 1,818 -777 Adjustment Portion (PA) RBSE + RTP 0 0 0 -42 969 -1,011 Infrastructure Revenue 584 0 584 1,207 0 1,207 Concession Asset Revenue 460 0 460 887 0 887 Gains in efficiency from implementing infrastructure -18 0 -18 0 0 0 Other Revenue 8 18 -10 35 46 -11 Deductions -81 -150 69 -545 -606 61 Net Revenue 301 839 -538 3,696 3,891 -195 Infrastructure Costs -213 0 -213 -739 0 -739 Costs of O&M and General Expenses -203 -192 -11 -628 -586 -42 Costs of Service Provided -2 -2 0 -2 -2 0 Depreciation -6 -142 136 -20 -562 542 EBIT -123 503 -626 2,307 2,741 -434 Equity Income 473 -33 506 473 -60 533 Amortization of goodwill -1 -1 0 -3 -2 -1 Revenue - Periodic Tariff Reset (RTP) 1,478 0 1,478 1,478 0 1,478 Other Operational Revenues (Expenses) 24 -10 34 173 113 60 Result Before Financial Result and Taxes 1,850 459 1,392 4,428 2,791 1,636 15

Financial Result -77 -80 3 -209 -208 -1 IR & CSLL -175 -3 -172 -835 -560 -275 Net Income before Participation of Non 1,598 376 1,222 3,383 2,023 1,359 Controlling Shareholder Participation of Non Controlling Shareholder -2 -2 0 -21 -21 0 Consolidated Income/Losses 1,597 374 1,222 3,362 2,002 1,360 ¹ Considers RAP from O&M, PA, PV, Anticipations and Regulatory Charges of Parent Company and Subsidiaries ² Considers CAAE Revenue (Annual Cost of Electricity Assets) of Parent Company and Subsidiaries

Revenues: As per IFRS, revenues from investments made during the concession period are booked as construction margin and the setup of discount rate for assets under contract. As per regulatory accounting rules, investments are treated as fixed assets, depreciated according to their useful life and RAP is booked as it is received during the concession period.

Costs: As per IFRS, the costs of implementing infrastructure refer to investments made, calculated as investment plus PIS and COFINS taxes and other charges.

Depreciation: Pursuant to IFRS, the concession asset is not considered a fixed asset, rather a financial asset or contractual asset. Again, as per IFRS, fixed assets largely relate to assets used by the Company and are not linked to the concession agreement. For Regulatory Result purposes, the concession asset is deemed a fixed asset with its respective depreciation.

Equity Income: The main effects of equity income are the same as for revenue, costs and depreciation explained above.

Income Tax/Social Contribution: As per IFRS, Income Tax/Social Contribution are provisioned monthly on an accrual basis and calculated pursuant to Law 12,973/14. The Company adopts the taxable income method and uses a monthly estimate. The consolidated effective tax rate as per IFRS was around 10% in 4Q20 and about 20% in 2020.

DEBT

On December 31, 2020, gross debt was BRL4,482.2 million, an increase of BRL1,238.3 million from the balance on December 31, 2019, mainly due to the funding operations, which was partially offset by the settlement of debts in accordance with Federal Law 4,131, which were hedged through swap operations in 3Q20 and the 6th issue of debentures in 4Q20.

Pursuant to CPC 06 (R2), starting from January 2019, the Company started recognizing obligations for future payments for all leasing agreements, except short-term and/or low-value agreements. In 4Q20, BRL53.5 million was added to IFRS gross debt, related to the Company’s leases. As such, IFRS gross debt totaled BRL4,535.7 million. The regulatory accounting did not change.

The increase in cash and cash equivalents of ISA CTEEP and its wholly-owned subsidiaries in 4Q20 reflects the amount raised to strengthen the Company's cash position. Excluding the cash and cash equivalents of non-consolidated subsidiaries², the Company’s net debt stood at BRL2,332.5 million at the end of December 2020, as against BRL2,546.6 million in December 2019, while the Net Debt/Adjusted EBITDA ratio closed the fiscal year at 0.9x.

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Debt 12/31/2020 12/31/2019 Chg (%) BRL (million)

Gross Debt 4,482.2 3,243.9 38.2%

Short-term Debt 312.6 1,077.4 (71.0%)

Long-term Debt 4,169.6 2,166.4 92.5%

Consolidated Availabilities 2,520.9 2,664.6 -5.4%

Availabilities of ISA CTEEP and Subsidiaries 100% 2,149.7 697.3 208.3%

Availabilities of Non-Consolidated Subsidiaries¹ 371.2 1,967.3 -81.1%

Consolidated Net Debt² 2,332.5 2,546.6 -8.4%

¹ A portion of the Company's funds are invested in exclusive investment funds, which are also used separately by the wholly-owned and non-consolidated subsidiaries (IE Madeira, IE Garanhuns, IE Aimorés, IE Paraguaçu and IE Ivaí), and refer to shares in highly liquid investment funds, easily convertible into cash, regardless of the maturity of the assets allocated to them. ² Net debt considers cash and cash equivalents of ISA CTEEP and wholly-owned subsidiaries

The company duly complies with the covenants and requirements for all of its issues. For 2020, the most restrictive Net Debt/EBITDA ratio is 3.0x. Further details on financial indicators are available in Attachment VII. Average cost of consolidated debt was 7.59% p.a. on December 31, 2020, compared to 7.46% p.a. on December 31, 2019. IPCA is the company’s main index for debt and revenues. Average term of consolidated debt on December 31, 2020 was 6.9 years.

Gross Debt Amortization Schedule Debt Breakdown (BRL million) 12/31/2020

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PROCEEDS The Bylaws of the Company establish the distribution of a minimum dividend that is the higher of BRL359 million or 25% of net income from the year (IFRS). In June 2018, management informed its dividend distribution practice through a proposal to distribute at least 75% of regulatory net income (used as proxy for cash generation), subject to approval by the Shareholders Meeting, limited to the maximum leverage of 3.0 times Net Debt/EBITDA, and the possibility of paying interim dividends, as envisaged in the Bylaws. The Company announced BRL1.7 billion as earnings for fiscal year 2020 (BRL2.535547), representing a payout of 83% of regulatory net income from the year and dividend yield of 9%. Moreover, on February 22, 2021, the Board of Directors approved the distribution of dividends totaling BRL531.2 million, equivalent to BRL0.806156 per share, which will be paid on May 21, 2021.

CAPEX

ISA CTEEP, its wholly-owned and non-consolidated subsidiaries1 invested BRL385.4 million in 4Q20, BRL96.0 million more than in 4Q19. In 2020, capex totaled BRL1,305.4 million, up BRL534.5 million from 2019. These increases are mainly due to higher investments in pre-operating subsidiaries with the progress of construction works and authorized investments in retrofitting projects. Attachment I breaks down the investments per greenfield project.

(BRL Million) 4Q20 4Q19 Var (%) 2020 2019 Var (%)

Retroffitings 104.7 61.1 71.4% 231.1 133.1 73.6%

Greenfield Projects 280.7 228.3 22.9% 1.074.3 637.8 68.5%

Total 385.4 289.4 33.2% 1,305.4 770.9 69.3%

Investments in Retrofitting Projects In 2020, investments in retrofitting projects totaled BRL 231.1 million, an increase of 73.6% from 2019. A total of 131 projects were energized during the year. The Company has authorizations for 277 projects with ANEEL investments of BRL 1.5 billion, which will be executed in the coming years. In 2021, half the retrofitting projects in the pipeline should be energized.

1 IE Madeira, IE Garanhuns, IE Aimorés, IE Paraguaçu and IE Ivaí 18

Investments in Greenfield Projects Since 2016, the Company has won the bids for 14 lots in the transmission auctions conducted by ANEEL, for which ANEEL invested (weighted by ISA CTEEP’s stake) BRL6.3 billion, with an increase in RAP (2020/2021 cycle) of around BRL645 million after the assets go operational. In 2020, around BRL 1.1 billion was invested in these projects (up 68.5% from 2019). The Company has already energized four of these projects (Itapura Bauru, Itaquerê, Tibagi and Aguapeí) at an average capex efficiency of 36% and 11 months in advance, on average. Following are the projects won in the auctions: IE Itapura Interligação Elétrica Itapura S.A. (“IE Itapura”) is responsible for executing Lot 25 won at Auction 015/2016 (“Itapura Bauru”) held by ANEEL in April 2017, and Lot 10 won at Auction 02/2018 (“Itapura Lorena”) held in June 2018. Itapura Bauru is located in the state of São Paulo and involves the installation of a 440 kV (-125/+250) MVAr static compensator in the existing Bauru substation. The installation of this equipment in the substation benefits the SIN as a whole and, especially, voltage control in the 440 kV network in São Paulo. Construction work began in 2Q18 and was completed in 3Q19, when the project obtained the Final Release Statement (TLD) from the ONS for full commercial operation on August 27, 2019 The project was completed with capex efficiency of 50% and 18 months in advance. Itapura Lorena is responsible for building a substation with a maximum capacity of 1,200 MVA in the city of Lorena in São Paulo, and a 7 km circuit transmission line. In August 2019, the subsidiary obtained the installation license from the São Paulo State Environmental Company (CETESB) for the substation and immediately commenced construction work in 3Q19. Until December 31, 2020, capex in this project totaled BRL 74.7 million. IE Itaquerê Interligação Elétrica Itaquerê S.A. (“IE Itaquerê”) is responsible for executing Lot 6 won at Auction 015/2016 held by ANEEL in April 2017. The project is located in São Paulo and includes the installation of three 500 kV (-180/+300) MVAr synchronous compensators in the Araraquara 2 substation (already being operated by State Grid). The installation of this equipment in the substation benefits the SIN as a whole and, especially, provides voltage control for the 440 and 500 kV systems in São Paulo. The subsidiary started construction work in 3Q18. The first equipment was energized in July 2020 and received partial RAP until its conclusion in December 2020. The project was delivered with Capex efficiency of 40% and 11 months in advance. IE Tibagi Interligação Elétrica Tibagi S.A. (“IE Tibagi”) is responsible for executing Lot 5 won at Auction 015/2016 held by ANEEL in April 2017. The project is located in the states of São Paulo and Paraná and involves the installation of a 17 km transmission line and the construction of a substation. The subsidiary obtained the installation license from IBAMA, the Brazilian environmental protection agency, in July 2018 and construction began in 3Q18. The project was delivered in 4Q20 with Capex efficiency of 12% and 8 months in advance. IE Aguapeí Interligação Elétrica Aguapeí S.A. (“IE Aguapeí”) is responsible for executing Lot 29 won at Auction 005/2016 held by ANEEL in April 2017. The project is located in São Paulo and involves the construction of 1,400 MVA substations and the installation of 121 km of transmission lines (140 km circuit). In June 2019, the subsidiary obtained all the installation licenses issued by CETESB and construction work began in 3Q19. The project was partially energized in January 2021 (105km of transmission lines and the Alta Paulista substation) and the process should be concluded in 1Q21. The project was delivered 6 months in advance of ANEEL’s deadline and with a capex efficiency of 40%. IE Itaúnas Interligação Elétrica Itaúnas S.A. (“IE Itaúnas”) is responsible for executing Lot 21 won at Auction 013/2015 held by ANEEL in October 2016. The project is located in the state of Espírito Santo and involves the installation of 79 km of transmission lines, the construction of a substation and the expansion of an existing substation. Expansion works began in 3Q18. The

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installation licenses for the transmission line and the construction of the substation were issued in August 2019 and works began in 3Q19. Until December 31, 2020, capex in this project totaled BRL 177,7 million. IE Biguaçu Interligação Elétrica Biguaçu S.A. (“IE Biguaçu”) is responsible for executing Lot 1 won at ANEEL auction 002/2018 held in June 2018. The project is located in Santa Catarina and involves the construction of a 300 MVA substation, expansion of an existing substation, and construction of a 57 km circuit transmission line including overhead, seabed and underground stretches. In 4Q20, the project obtained the Installation License for the Ratones substation and the equipment in the transition zones. The licensing process for the transmission lines is in progress. Until December 31, 2020, capex in this project totaled BRL 116.9 million. IE Paraguaçu IE Paraguaçu is responsible for executing Lot 3 won at Auction 013/2015 held by ANEEL in October 2016. The Company and Transmissora Aliança de Energia Elétrica S.A. (“Taesa”) each hold 50% interest in the project. The project is located in the states of Bahia and Minas Gerais and involves the installation of 338 km of transmission lines. In May 2019, ISA CTEEP obtained the Installation License from IBAMA for the project and works began in 2Q19. Until December 31, 2020, capex related to ISA CTEEP’s interest in the project totaled BRL 230.2 million. IE Aimorés IE Aimorés is responsible for executing Lot 4 won at Auction 013/2015 held by ANEEL in October 2016. The Company and Taesa each hold 50% interest in the project. The project is located in Minas Gerais and involves the installation of 208 km of transmission lines. In April 2019, IBAMA issued the installation license and works began in 2Q19. Until December 31, 2020, capex related to ISA CTEEP’s interest in the project totaled BRL 155.5 million. IE Ivaí IE Ivaí is responsible for executing Lot 1 won at Auction 05/2016 held by ANEEL in October 2017. The Company and Taesa each hold 50% interest in the project. The project is located in Paraná and involves the construction of three substations with total capacity of 2,988 MVA, besides the installation of 600 km of double-circuit transmission lines, totaling 1,200 km. Works began in October 2019. Until December 31, 2020, capex related to ISA CTEEP’s interest in the project totaled BRL 446.7 million. Minuano Project The Minuano Project is responsible for executing Lot 3 won at Auction 02/2019 held by ANEEL in December 2019. The project is located in the state of Rio Grande do Sul and involves the construction of an 800 MVA substation and 169 km of transmission lines. In 4Q20, the project obtained the installation license for the Caxias Norte substation. The licensing process for the transmission lines is in progress. Until December 31, 2020, capex in this project totaled BRL 10.6 million. This concession agreement is in the subsidiary Evrecy. Três Lagoas Project The Três Lagoas Project is responsible for executing Lot 6 won at Auction 02/2019 held by ANEEL in December 2019. The project is located in São Paulo and Mato Grosso do Sul and involves the installation of 37 km of transmission lines and the expansion of two substations. The installation license for the project was obtained in January 2021. Until December 31, 2020, capex in this project totaled BRL 2.1 million. This concession agreement is in the subsidiary IE Tibagi.

Triângulo Mineiro Project The Triângulo Mineiro Project is responsible for executing Lot 7 won at Auction 02/2019 held by ANEEL in December 2019. The project is located in Minas Gerais and involves the construction of four 1,600 MVA substations and 173 km of transmission lines. The installation license is expected in 3Q21. Until December 31, 2020, capex in this project totaled BRL 10.1 million. This concession agreement is in the subsidiary IEMG (Interligação Elétrica de Minas Gerais S.A.).

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Riacho Grande Project The Riacho Grande Project is responsible for executing Lot 7 won at Auction 01/2020 held by ANEEL in December 2020. The project involves the installation of 63 km of 800 MVA transmission lines to supply energy to the Northern, Southern and Eastern regions of the city of São Paulo and the ABC region. The installation license is expected to be obtained in 3Q23.

SUSTAINABILITY ISA CTEEP has been signatory to the UN Global Compact since 2011 and its commitments are underscored by the Company’s strategy, which is focused on sustainable value generation and responding to global challenges set out in the United Nations (UN) 2030 Agenda. The Company aims to contribute by achieving the Sustainable Development Goals (SDG), considering six of them as priority:

Invests resources and knowledge in favor of new generations through the strategy of private social investment and volunteer program. It establishes connections with children and youth from communities to enable them to complete their educational cycles satisfactorily and supports entrepreneurs to strengthen their business ideas. Contributes through electricity transmission, participating actively in the electricity sector and in the innovation ecosystems, rolling out initiatives to create a society with an innovative infrastructure and which provides welfare and access to energy in a reliable and safe manner for the population. The Company reinforces its commitment to connecting with renewable energy through the issue of green bonds to execute retrofitting and greenfield investments.

“Conexão Jaguar” is one of the Company’s sustainability programs, whose main goals are biodiversity conservation, mitigation of climate change and local development. Currently, it supports one of the regions recognized as a World Heritage Site – the Serra do Amolar region in Pantanal – in the conservation of over 76,000 hectares of preserved area. To learn more, visit https://conexionjaguar.org/pt-br/conexao-jaguar/.

ISA CTEEP’s greenhouse gas emission inventory has obtained the Gold Seal from the Brazilian GHG Protocol Program.

The Company has implemented the Business Ethics and Integrity Program and the Anticorruption Policy, which guide the conduct of employees in their interactions with stakeholders.

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Business Sustainability ISA CTEEP is committed to sustainability in its business, from the construction of its assets to their operation. In the Aguapeí Project, energized in 1Q21, the ISA CTEEP team used techniques to minimize the impact on the environment, such as greater distance of transmission towers from the soil and the laying of cables using drones, which avoided interventions in around 25 hectares of the Atlantic Rainforest, thereby preserving the native vegetation. It also carried out environmental compensation by planting 4.95 hectares of native vegetation. In addition, the Company and the companies contracted for project construction donated 5,000 seedlings to Flórida Paulista, a town in the interior region of São Paulo. Moreover, 100% of the recyclable waste generated during the construction of Aguapeí was sent for recycling.

In the Três Lagoas Project, ISA CTEEP will use techniques to minimize environmental impacts, such as the distribution and elevation of towers, resulting in minimum removal of vegetation; laying of cables using drones, which avoids interventions and preserves native vegetation; and the adoption of stowage in 100% of the new accesses located in flooded areas. In addition, Environmental Education and Social Communication Programs will be run during the construction period.

Incentivized Social Investment ISA CTEEP supports social projects by using incentivized and own resources. In 2020, was invested approximately R$ 19 million, of which BRL 14 million with tax incentives in 14 different projects, which will be implemented during 2021. The details of the projects are in Attachment II. Our commitment to social development went beyond our efforts to support initiatives aimed at combating COVID-19. As part of the “Todos Somos Um” campaign launched by the ISA Group, the Company donated approximately BRL 5 million in 2020, including its own funds and those collected by employees who participated in the humanitarian actions. During the year, it allocated BRL 1.5 million to Fiocruz, BRL 160,000 to the Saving Lives, the match funding program launched by BNDES, which doubled the amount collected, and BRL 3.2 million to the Butantan Institute to build a Multipurpose Vaccine Production Center, which should start producing vaccines against the coronavirus in 2021. COVID-19 ISA CTEEP provides an essential service to society and is committed to and responsible for the health and safety of its stakeholders. That is why, it has taken the following measures to protect and monitor the impacts of the pandemic: • Adoption of remote work for 100% of the administrative teams; • Assets under construction following all recommended safety protocols; • Periodical monitoring through a multidisciplinary committee, with participation of senior management; and • Monitoring and promotion of employees’ physical and mental health with the creation of a health channel (available 24 hours) and strengthening of internal communication about COVID-19.

CAPITAL MARKETS ISA CTEEP has its common (“TRPL3”) and preferred shares (“TRPL4”) traded on the São Paulo Stock Exchange (“B3”) and, since 2002, has also been listed on Level 1 of the Corporate Governance segment, valuing ethics and transparency in its dealings with shareholders and other stakeholders. The Company’s shares are included in several stock indices, including the Corporate Governance Index, which includes companies with differentiated corporate governance standards, the Brazil 100 Index, which includes companies with the most traded equities on B3, and the Carbon Efficient Index (ICO2), which includes companies that demonstrate greater transparency in reporting their greenhouse gas emissions and how they are preparing for a low carbon economy Moreover, the Company has joined the American Depositary Receipts (“ADR”) program

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– Rule 144A in the United States and its ADRs are traded under the tickers “CTPTY” (common share) and “CTPZY” (preferred share). The common and preferred shares of ISA CTEEP ended 2020 trading at BRL29.35 and BRL27.81, respectively. On December 29, 2020, TRPL4 reached its historical peak of BRL 28.37. The Company’s market capitalization on December 31, 2020, was BRL18.7 billion. In 2020, the preferred shares of ISA CTEEP appreciated 32%. Average daily trading volume on B3 was BRL 39.7 million in 2020, 16% higher than in 2019. Average trades per day stood at 1.9 million, 11% more than the 1.7 million in 2019.

Performance of TRPL3, TRPL4 vs. IBOV and IEE (Base 100): 12/31/2019 to 12/31/2020

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EVENTS DURING THE PERIOD

Dividends approval

On October 29, 2020, the Company announced that the Board of Directors' Meeting approved the payment of dividends totaling BRL344 million as interim dividends, corresponding to BRL 0.522095 per share of both types. The interim dividends will charged to the mandatory dividends for fiscal year 2020. Click here for details.

On December 11, 2020, the Company announced that the Board of Directors' Meeting approved the payment of interim dividends totaling BRL 116 million, corresponding to BRL 0.176055 per share of both types, and the payment of interest on equity in the gross amount of BRL 436 million, corresponding to BRL 0.661494 per share. The interim dividends and interest on equity will be charged to the mandatory dividends for fiscal year 2020. Click here for details.

Payment of Interest - Debentures

On October 15, 2020, the Company announced the payment of interest of BRL 25.26788082 per debenture to the holders of debentures related to the 7th Issue of Simple Debentures. Click here for details.

On December 14, 2020, the Company announced the payment of principal in the amount of BRL 1,000 per debenture and interest of BRL 10.55913000 per debenture to the holders of debentures related to the 6th Issue of Simple Debentures. Click here for details.

On December 15, 2020, the Company announced the payment of interest of BRL 18.34524603 per debenture to the holders of debentures related to the 8th Issue of Simple Debentures. Click here for details.

PBTE

On December 2, 2020, the Company announced the acquisition of Piratininga - Bandeirantes Transmissora de Energia (PBTE). The PBTE line connects two ISA CTEEP substations (Bandeirantes and Piratininga 2) and started operating in April 2020. The acquisition price was BRL 1,594 million, with net debt estimated at BRL 292 million on the baseline date of December 31, 2020. The conclusion of this operation is linked to the fulfillment of certain precedent conditions that commonly apply to operations of this type. Click here for details.

9th issue of debentures

On December 3, 2020, the Board of Directors of the Company approved the 9th issue of simple debentures in two series. The issue amount was BRL 1.6 billion, with the 1st series maturing 8 years from the issue date and the 2nd series maturing 23 years and 6 months from the issue date. Click here for details.

Operational startup of IE Tibagi

On December 4, 2020, the Company announced the operational startup of IE Tibagi, 8 months in advance and at an investment of BRL 118 million, 12% lower than the ANEEL capex. Click here for details.

Operational startup of IE Itaquerê

On December 11, 2020, the Company announced that IE Itaquerê, a wholly-owned subsidiary of ISA CTEEP, obtained the Final Release Statement (“TLD”) from the National Electricity System Operator (“ONS”) for full commercial operation on 24

December 4, 2020 with receipt of the full permitted annual revenue (RAP) from that date. Investments in IE Itaquerê totaled about BRL 250 million, approximately 40% lower than the ANEEL capex and concluded 11 months in advance. Click here for details.

Unified Preliminary and Installation Licenses obtained for Minuano Project

On December 16, 2020, the Company announced that it obtained the Unified Preliminary and Installation Licenses (“LPI”) for the Caxias Norte substation of the Minuano project, enabling it to start construction work. ANEEL’s investment is BRL 682 million and RAP for the 2020-2021 cycle is BRL38 million. The deadline set by ANEEL for energization is December 2024. Click here for details.

Transmission Auction 01/2020

On December 17, 2020, the Company announced that it had won Lot 7 of Transmission Auction 01/2020 held by ANEEL. The project involves the installation of 63 km of 800 MVA transmission lines to supply energy to the Northern, Southern and Eastern regions of the city of São Paulo and the ABC region. ANEEL’s planned investment is BRL 1,141 million and the period of construction is 60 months. RAP is BRL 68 million. Click here for details.

EVENTS SUBSEQUENT TO THE REPORTING PERIOD

Installation License obtained for Biguaçu Project

On January 4, 2021, the Company announced that it had obtained the Installation License for the Biguaçu project. ANEEL’s investment is BRL 641 million and RAP for the 2020-2021 cycle is 42 million. Click here for details.

ICO2

On January 5, 2021, the Company announced that it was included in the new portfolio of the Carbon Efficient Index (ICO2) of B3 - Brasil Bolsa Balcão, effective until the end of April 2020. Being included in this index demonstrates ISA CTEEP’s commitment to transparency and management of GHG emissions from the business, as well as the Company’s contribution to the low carbon economy. Click here for details.

Installation License obtained for Três Lagoas project

On January 26, 2021, the Company announced that it obtained the installation license from IBAMA for the Três Lagoas project. With the Installation License obtained, construction works can begin. Click here for details.

Operational startup of IE Aguapeí On February 2, 2021, the Company announced that it energized the Alta Paulista substation (800 MVA) and 105 km of transmission lines, which represent 59% of IE Aguapeí's RAP, six months ahead of the deadline set by ANEEL. Investments in IE Aguapeí totaled about BRL 360 million, more than 40% lower than the ANEEL capex. Click here for details.

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10th issue of debentures On February 4, 2021, the Board of Directors of the Company approved the 10th issue of simple debentures in a single series. The issue amount is BRL 672.5 million and matures in July 2044. Net proceeds from the debenture issue will be used to replenish the Company's cash after the investments made in its assets. Click here for details.

Approval of dividend proposal On February 22, 2021, the Board of Directors of the Company approved the distribution of dividends amounting to BRL 531.2 million, corresponding to BRL 0.806156 per share.

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UPCOMING EVENTS

4Q20 Conference Call 02.23.2021 10:00 a.m. (BRT) / 9:00 a.m. (EDT) Connection Details: Brazil: +55 11 4210-1803 / +55 11 3181-8565 Other Countries: +1 412 717-9627 Password: ISACTEEP Link for webcast available on the Investor Relations website: www.isacteep.com.br/ir

OTHER RELEVANT INFORMATION

Annual RAP Adjustment

Ratification Resolution (REH) 2,725 was published on July 15, 2020, establishing new RAPs for ISA CTEEP and its subsidiaries for providing the transmission installations to members of the Basic Network and Other Transmission Installations for a 12-month cycle from July 1, 2020 to June 30, 2021 (2020/2021 cycle). Pursuant to REH 2,725, the RAP and the amounts corresponding to the adjustment portion (PA) of the Parent company, net of PIS and COFINS, was set at BRL3,131 million for the 2020/21 cycle: i. inflation adjustment2 for the 2019/2020 cycle (IPCA) totaling BRL49 million, which includes BRL29 million related to the portion received from RBSE; ii. operational startup of new retrofitting projects during the 2019/2020 Cycle, which added BRL10 million to the RAP; iii. inclusion once again in the RAP of “Ke” of the financial component of RBSE, which had been suspended by injunctions; iv. effects of the periodic tariff review, which included a review of the asset base, change of regulatory WACC and definition of a new level for O&M costs, which jointly result in a negative impact of BRL73 million; v. positive adjustment portion of BRL232 million due to the receipt of the first portion (portion 1 of 3) of PA (RTP and RBSE) related to the 2017-2020 retroactive adjustment, in the amount of +BRL303 million, partially offset by the return of revenue received in advance of -BRL71 million.

¹ IPCA and IGPM from June 2019 to May 2020 were 6.50% and 1.88%, respectively.

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The RAP of the Subsidiaries in operation (IEMG, Evrecy, IE Pinheiros, IE Serra do Japi, IENNE, IESUL and Itapura Bauru), net of PIS and COFINS, totaled BRL 237 million in the 2020/2021 cycle. The change is due to: i. inflation adjustment for the 2019/2020 cycle totaling +BRL6 million; ii. the outcome of the administrative appeal against REH 2556/19, related to the tariff review of IE Pinheiros and IESUL, entailing a RAP increase of around BRL2 million compared to the results initially pointed out by said REH; partially offset; and iii. 50% reduction in the RAP for agreement 143/2001 of Serra do Japi as established in the concession agreement. The RAP and amounts corresponding to the PA of non-consolidated subsidiaries (IE Madeira and IE Garanhuns), net of PIS and COFINS, were BRL 647 million in the 2020/2021 cycle. This increase is basically due to the inflation adjustment during the period and the positive effects of the outcome of the administrative appeal against REH 2556/19 related to the tariff review at IE Madeira.

Below is a summary of the new RAPs for the 2020/2021 cycle, including regulatory charges but net of PIS and COFINS.

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Parent Company RAP RAP Concessionaire Reinforcements and RAP RAP Contract Index 19/20 Cycle Inflation Ke RTP 20/21 Cycle PA Chg% (BRL million) Improvements 20/21 Cycle1 19/20 Cycle REH 2.565 REH 2.725 ISA CTEEP 1,102 20 10 0 (76) 1,057 232 1,289 1,046 23% 059/2001 IPCA ISA CTEEP - RBSE 1,532 29 0 279 3 1,842 1,842 1,533 20% Total Parent Company 2,634 49 10 279 (73) 2,899 232 3,131 2,579 21%

SUBSIDIARIES (100% ISA CTEEP) RAP RAP Concessionaire Reinforcements and 50% RAP RAP RAP Contract Index 19/20 Cycle Inflation RTP² 20/21 Cycle PA Chg% (BRL million) Improvements Reduction³ 20/21 Cycle1 19/20 Cycle REH 2.565 REH 2.725 Subsidiaries (100%) in operation 361 8 1 2 (5) 366 3 370 350 6% IEMG 004/2007 IPCA 20 0 0 0 0 20 (0) 20 19 5% EVRECY5 020/2008 IGP-M 13 1 0 0 0 13 (1) 13 10 28% 012/2008 11 0 0 0 0 11 0 12 11 7% 015/2008 37 1 1 1 0 39 1 39 35 13% IE PINHEIROS IPCA 018/2008 6 0 0 (0) 0 6 (0) 6 6 -4% 021/2011 6 0 0 0 0 6 (0) 6 5 22% 026/2009 IPCA 43 1 0 0 0 43 (0) 43 42 3% IE JAPI 143/2001 IGP-M 17 1 0 0 (5) 13 (0) 13 16 -18% IENNE 001/2008 IPCA 48 1 0 0 0 49 4 53 46 14% 013/2008 6 0 0 0 0 6 0 6 6 7% IE SUL IPCA 016/2008 13 0 0 1 0 14 1 14 12 19% IE ITAPURA 042/2017 IPCA 12 0 0 0 0 12 (0) 12 12 0% IE ITAQUERÊ 027/2017 IPCA 51 1 0 0 0 52 0 52 51 1% IE TIBAGI 026/2017 IPCA 20 0 0 0 0 21 0 21 20 3% IE AGUAPEÍ 046/2017 IPCA 59 1 0 0 0 60 0 60 59 2%

Consolidated ISA CTEEP in operation 2,994 57 11 281 (78) 3,265 236 3,501 2,929 20%

SUBSIDIARIES (equity income) RAP RAP Concessionaire Reinforcements and RAP RAP Contract Index 19/20 Cycle Inflation RTP4 Others Ciclo 20/21 PA Chg% (BRL million) Improvements 20/21 Cycle1 19/20 Cycle REH 2.565 REH 2.725 Subsidiaries (non-consolidated) in operation 624 12 0 13 0 649 (2) 647 602 7% 013/2009 285 5 0 7 0 297 (1) 296 273 9% IE MADEIRA (51% ISA CTEEP) IPCA 015/2009 245 5 0 6 0 255 (0) 255 238 7% IE GARANHUNS (51% ISA CTEEP) 022/2011 IPCA 94 2 0 0 0 96 (1) 95 91 5% Participation ISA CTEEP 318 6 0 7 0 331 (1) 330 307 7%

ISA CTEEP in operation 3,313 63 11 287 (78) 3,596 235 3,831 3,236 18%

SUBSIDIARIES UNDER CONSTRUCTION

RAP RAP Concessionaire Reinforcements and RAP RAP Contract Index 19/20 Cycle Inflation RTP Others Ciclo 20/21 PA Chg% (BRL million) Improvements 20/21 Cycle1 19/20 Cycle REH 2.565 REH 2.725 Subsidiaries (100%) under construction 104 2 0 0 0 181 (0) 181 103 76% IE ITAÚNAS 018/2017 IPCA 52 1 0 0 0 53 0 53 52 3% IE TIBAGI 006/2020 IPCA 0 0 0 0 0 5 0 5 0 N.A. IE ITAPURA 021/2018 IPCA 11 0 0 0 0 11 (0) 11 11 -1% IE BIGUAÇU 012/2018 IPCA 40 1 0 0 0 41 0 41 40 3% EVRECY5 001/2020 IPCA 0 0 0 0 0 38 0 38 0 N.A. IEMG 007/2020 IPCA 0 0 0 0 0 33 0 33 0 N.A. Subsidiaries (non-consolidated) under construction 492 9 0 0 0 501 0 501 491 2% IE PARAGUAÇU (50% ISA CTEEP) 003/2017 IPCA 118 2 0 0 0 121 0 121 118 2% IE AIMORÉS (50% ISA CTEEP) 004/2017 IPCA 79 1 0 0 0 81 0 81 79 2% IE IVAÍ (50% ISA CTEEP) 022/2017 IPCA 294 6 0 0 0 300 0 300 294 2% Participation ISA CTEEP 246 5 0 0 0 251 0 251 246 2%

ISA CTEEP under construction 350 7 - - - 432 (0) 432 349 24%

ISA CTEEP in operation and under construction 3,662 70 11 287 (78) 4,028 235 4,263 3,585 19% ¹ 2020/2021 RAP cycle with PA ² Considers the outcome of the administrative appeal against REH 2556/19 and the result of RTP for retrofitting projects (REH 2702 and 2705/20) ³ Contract 143 of Serra do Japi establishes a 50% reduction in RAP from November 2019. In the 2019/20 cycle, the impact of the reduction was partial. The 2020/21 cycle is the first with full impact. On December 18, 2020, REH 2826/20 was published, concluding Public Consultation 027/20 on the RTP of IE Serra do Japi’s agreement 026/2009. However, the positive result of RTP of 2.86% will be applied only from July 2021, with retroactive effect from July 2020. On December 23, 2020, an Administrative Appeal was filed with ANEEL regarding the valuation reports of BRR’s assets for agreement 026/2009 of IE Serra do Japi, since the regulatory authority used one of the previous versions of the valuation report in the RTP and did not consider the final version submitted on June 5, 2020. 4 Considers the outcome of the administrative appeal against REH 2556/19 5 Includes PIS / COFINS 6 RAP amount of IE Tibagi does not consider adjustments related to the contractual amendment (-13.5%) approved by the Board of ANEEL on 10/26/20 7 On December 18, 2020, REH 2826/20 was published, concluding Public Consultation 027/20 on the RTP of IE Serra do Japi’s agreement 026/2009. However, the positive result of RTP of 2.86% will be applied only from July 2021, with retroactive effect from July 2020. On December 23, 2020, an Administrative Appeal was filed with ANEEL regarding the valuation reports of BRR’s assets for agreement 026/2009 of IE Serra do Japi, since the regulatory authority used one of the previous versions of the valuation report in the RTP and did not consider the final version submitted on June 5, 2020.

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Concession Renewal – Agreement 059/2001 (RBNI/RBSE)

On September 12, 2012, Provisional Presidential Decree 579/2012 (MP 579) was published regulating the extension of power generation, transmission and distribution concession agreements. According to the Decree, expired concessions or concessions due to expire within 60 months from its publication had the option to advance their maturity to December 2012 and subsequently extend the respective agreements for up to 30 years.

On November 1, 2012, the Ministry of Mines and Energy (MME) published Interministerial Ordinance 580, which defined the reversal amounts for installations energized from June 1, 2000, that is, the Basic Network of New Installations (“RBNI”). The amount fixed for ISA CTEEP was BRL 2.9 billion. The same date, the MME published Interministerial Ordinance 579, which set the RAP amount for ISA CTEEP at BRL 515.6 million starting from January 1, 2013, which represents a reduction in RAP of approximately 75%.

On November 29, 2012, Provisional Presidential Decree 591 was published authorizing the Concession Authority to pay the amount for undepreciated assets existing prior to May 31, 2000, that is, Basic Existing System Network(“RBSE”).

In December 2012, ISA CTEEP held an Extraordinary Shareholders Meeting to decide on advancing the expiry of Concession Agreement 059/2001 as proposed in PM 579. The Company’s shareholders unanimously approved extending the agreement pursuant to Law 12,783/2013 and the concession was extended to December 2042, guaranteeing the Company the right to receive the amounts relating to the RBNI and RBSE assets.

The amounts related to RBNI, equivalent to BRL 2.9 billion, were received between 2013 and 2015. For the RBSE assets, an independent valuation report was requested to value the investments at the New Replacement Value (“VNR”), adjusted for depreciation up to December 31, 2012. In December 2015, ANEEL approved, through Order 4,036, the value of RBSE assets for ISA CTEEP at BRL 3.9 billion.

In April 2016, MME issued Ordinance 120, which determined that the amounts approved by ANEEL for RBSE facilities be included in the Regulatory Remuneration Base of electricity transmission concessionaires as from the 2017 tariff process for an estimated period of 8 years.

ANEEL Order 1,484/17 of May 2017 redefined the total RBSE amount for ISA CTEEP at BRL 4.1 billion. The initial impact of the RBSE values was the accounting recognition according to IFRS in September 2016 as per the conditions established by MME Ordinance 120. As for regulatory results, the impact on the Company’s numbers is apparent from the initial payments received in July 2017. However, payment of the financial component Ke was suspended in 2017 due to injunctions obtained by some consumers in court.

Starting from November 2019, the courts started dismissing certain lawsuits, which forced the exclusion of Ke from the remuneration on the financial component. ANEEL thus included the remuneration of the financial component by “Ke” in RAP starting from the 2020-2021 cycle. The amount not received in the first three cycles of RBSE will be included, through an adjustment installment, in the 2020 to 2023 cycles.

Moreover, the regulatory WACC and the Regulatory Remuneration Base were updated in the tariff review process. The flow of receipts of the economic component from RBSE was also adjusted according to the useful life of assets. Accordingly, the financial component will be received over 8 years, but the economic component will be received in the asset depreciation curve. The bars are amounts net of PIS/COFINS plus regulatory charges.

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Flow of Receipts of RBSE (BRL million)

Note: The graph shows amounts defined for the revenue cycles 2017/2018 (REH ANEEL 2,258), 2018/2019 (REH ANEEL 2,408) and 2019/2020 (REH ANEEL 2,565) and 2020/2021 (REH ANEEL 2,725). Assumptions for future cycle as per REN ANEEL 762/2017 and based on the worksheets published at the end of CP 22/2020. Nominal values – base date: June 2020

Supplementary Retirement Plan – Law 4,819/58 The supplementary retirement plan is governed by State Law 4,819/58 and applies to employees hired prior to May 13, 1974, by government agencies and corporations in which the state of São Paulo is the controlling shareholder and exercises control.

The funds needed to meet the costs under this plan are the responsibility of the São Paulo State Government and the plan was implemented as per the agreement between the Tax Authority of the State of São Paulo (SEFAZ) and the Company on December 10, 1999. Payments of the supplementary retirement benefits are made monthly by SEFAZ. SEFAZ transferred the amount to be paid to ISA CTEEP, which then transferred it to Fundação CESP to be paid to individual retirees.

Since January 2004, retiree benefits have been processed directly by SEFAZ. This change in the process revealed disallowances such as payments in excess of the ceiling (equivalent to the State Governor’s salary). As a result, SEFAZ started excluding the surplus amounts from the benefits paid to retirees.

Public-Interest Civil Action and Class Action In June 2005, after the courts dismissed a claim, the Funcesp Retirees Association (“AAFC”) obtained an injunction in the Labor Court, which ordered the maintenance of the previous payment in full. The benefits payment process has since reverted to the original model, where Fundação CESP was responsible for retirement payments. However, SEFAZ continues to transfer the adjusted amount to ISA CTEEP, which then adds the difference so that retirement payments are made in full, as ordered by the injunction.

Collection Lawsuit Since 2005, SEFAZ has been transferring to the Company amounts lower than required to make full payment (about 70%) to the retirees following an injunction by the 49th Labor Court. ISA CTEEP has since been making up the difference to ensure full payment of retiree benefits (about 30%). The difference paid by ISA CTEEP is being claimed in a collection lawsuit filed against SEFAZ.

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The São Paulo Court of Appeals ruled in the Company’s favor. In August 2017, SEFAZ filed a special appeal at the Federal Court of Appeals (STJ), which is awaiting the analysis of admissibility. On December 31, 2020, the amount booked in the Company’s balance sheet was approximately BRL2.3 billion, net of provisions for losses on the realization of credits in 2013.

In August 2018, ISA CTEEP obtained a ruling from the São Paulo Court of Appeals requiring SEFAZ to refrain from disallowing any transfers concerned with the payment of benefits under Law 4,819/58 before concluding the administrative proceedings to check for irregular payments. In March, the Federal Court of Appeals, in an interim individual ruling by Justice Francisco Falcao, suspended the effects of the injunction that prohibited São Paulo State Finance Department from making deductions in its payments to ISA CTEEP. The Company once again received the transfer with the disallowances, forcing it to supplement the amount paid in April 2019.

The Company continues its efforts to uphold the favorable ruling given by the São Paulo Court of Appeals.

GLOSSARY Brazilian Electricity Regulatory Agency (ANEEL) - Agency entrusted with regulating and supervising the generation, transmission, distribution and sale of electricity in Brazil, ensuring the quality of services provided, the fair treatment of users and controlling the reasonableness of tariffs charged to consumers, while maintaining economic and financial viability of the players and the sector. ANEEL inspects and regulates access to transmission systems and establishes the tariffs for such systems, including TUST, which is the tariff charged for the use of the Basic Network and Other Transmission Installations (DIT).

CAAE (Annual Cost of Electricity Assets) – Revenue from investments in assets. It consists of the remuneration on capital and the regulatory reintegration quota (QRR)

CAOM (Management, Operating and Maintenance Costs) - Portion of revenue that can be divided into (i) revenue from O&M, which is used to bear the costs and expenses (e.g.: wages, maintenance expenses and others); and (ii) revenue to pay for costs of movable and fixed installations (CAIMI).

CDE (Energy Development Account) - regulatory charge to ensure the universal supply of energy and subsidize low- income consumers.

DIT (Other Transmission Installations) - Installations with voltage lower than 230 kV.

EBITDA - Earnings Before Interest, Taxes, Depreciation & Amortization.

Electric Energy Trading Chamber (CCEE) - Operating under the authorization of the government, and regulated and supervised by ANEEL, its mission is to promote the purchase and sale of electricity among its members.

Energization - operational startup of a project (retrofit or greenfield).

Energy Transmission Auctions - Auctions held by MME and ANEEL to grant concessions for transmission lines and substations in Brazil.

EPE (Energy Research Company) - Federal government agency linked to the Ministry of Mines and Energy. Responsible for national energy planning, including generation, transmission, distribution, oil and gas.

Greenfield - projects to achieve growth through auctions.

IEE (Electric Utilities Index) - B3 stock exchange index that measures the performance of the electricity sector. 32

MME –Brazil’s Ministry of Mines and Energy

National Electricity System Operator (ONS) - Brazilian agency responsible for coordinating and controlling power generation and transmission operations in the SIN.

O&M - Operation and Maintenance.

Organic growth - growth through investments in retrofitting projects.

Other revenues - Revenues from non-concession operations, partly intended to enable lower tariffs.

PA (Adjustment Portion) - Offsets the funding surplus or deficit in the period prior to the adjustment.

PROINFA - Incentive Program for Alternative Electricity Sources (regulatory charge for subsidies to alternative energy sources).

PV (Variable Portion) - Penalizes revenue from asset due to unavailability.

RAP (Permitted Annual Revenue) - Remuneration received by transmission companies for providing public transmission services to users. For transmission companies that won auctions, RAP is obtained as a result of the transmission auction itself and is paid to them upon the operational startup of their installations, and is reviewed every four or five years as per the concession agreements. For transmission companies whose concession agreement was renewed, RAP was calculated based on the Operation and Maintenance costs, pursuant to Law 12,783 of January 11, 2013. In cases where studies indicate the need for reinforcements in the transmission concession, ANEEL calculates an additional amount for RAP to remunerate new installations, always through an Authorizing Resolution.

RB (Basic Network) - SIN transmission installations owned by public transmission services concessionaires, defined according to the criteria established in ANEEL regulations.

RBNI (Basic Network New Investments) - Portion of revenue (RAP) corresponding to the new authorized installations of the Basic Network, whose revenues are established by a specific resolution.

RBSE (Basic Network of Existing System) - Portion of RAP corresponding to installations in the Basic Network, defined in the Appendix to Resolution 166 of May 31, 2000.

Regulatory Charges - these are charged by transmission companies and passed on to CCEE, ANEEL and MME, and also invested in R&D projects. These have a neutral effect on the transmission company.

Retrofitting Project - includes the installation, replacement or refurbishment of equipment in existing transmission facilities or adaptations made in these facilities to maintain the regularity, continuity, safety and timeliness of the public electricity transmission services, or adaptations made to these facilities to expand transmission capacity, increase the reliability of the National Interconnected System, the useful life or connection of users, as recommended by the transmission system expansion plans.

SIN (National Interconnected System) - All the installations and equipment that supply electricity to regions across the country, which are electrically interconnected according to applicable regulations.

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TUST (Electricity Transmission System Usage Tariff) - Tariff paid by distributors, generators and free and special consumers for use of the Basic Network and DIT, and is adjusted annually according to (i) inflation; and (ii) new revenues from energized projects.

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ATTACHMENTS

Attachment I - Greenfield Projects

ANEEL CAPEX RAP ISA CTEEP Entry in % ISA ISA CTEEP Contract Implementation Environmental Initiation of Land Projects Auctions Subsidiaries Location Discount Cycle 2020/2021 Necessity Date¹ Commercial CTEEP Participation signature Deadline ANEEL License (LI) Construction 4 5 (BRL MM) Development Development Operation (BRL MM)

IE Paraguaçú Bahia 50% 255 0.0% 61 Feb-17 Feb-22 Jan-19 2Q19 98% 86% - (Lot 3) Minas Gerais ✓

Auction IE Aimorés 013/2015 50% Minas Gerais 171 0.0% 41 Feb-17 Feb-22 Jan-19 2Q19 100% 86% - (Lot 4) ✓ 10/28/2016

IE Itaúnas 100% Espírito Santo 298 25.1% 53 Feb-17 Feb-22 Jul-18 3Q18 100% 66% - (Lot 21) ✓

IE Ivaí 50% Paraná 968 33.2% 150 Aug-17 Aug-22 feb/21² 4Q19 87% 64% - (Lot 1) ✓

IE Tibagi6 São Paulo 100% 135 32.2% 21 Aug-17 Aug-21 Jan-17 3Q18 100% 100% 4Q20 (Lot 5) Paraná ✓

Auction 05/2016 IE Itaquerê 100% São Paulo 398 44.5% 52 Aug-17 Aug-21 Jun-18 3Q18 100% 100% 3Q20 4/24/2017 (Lot 6) ✓

IE Aguapeí 100% São Paulo 602 52.7% 60 Aug-17 Aug-21 dez/18 3Q19 100% 98% 1Q21 (Lot 29) ✓

IE Itapura São Paulo 100% 126 57.6% 12 Aug-17 Feb-21 ago/19 2Q18 100% 100% 3Q19 (Lot 25) (Bauru) ✓

IE Itapura São Paulo 100% 238 73.9% 11 Sep-18 Sep-22 Jan-20 3Q19 100% 85% - (Lot 10) (Lorena) ✓ Auction 02/2018 06/29/2018 IE Biguaçu 100% Santa Catarina 641 66.7% 41 Sep-18 Sep-23 Sep-21 1Q21 63% 52% - (Lot 1) ✓

Minuano Rio Grande do 100% 682 66.9% 38 mar/20 dez/24 jan/20 3Q21 - 16% 23% - (Lot 1) Sul

Auction Mato Grosso do Três Lagoas 02/2019 100% Sul 99 68.1% 5 mar/20 jun/23 jan/20 1Q21 64% 24% - (Lot 6) ✓ 12/19/2019 São Paulo

Triângulo Mineiro 100% Minas Gerais 554 65.4% 33 mar/20 dez/24 jan/20 3Q21 - 20% 21% - (Lot 7)

Auction 01/2020 Riacho Grande 100% São Paulo 1,141 57.9% 68 Mar-21 Dec-25 Jan-26 3Q23 - - 0% - 12/17/2020 (Lot 7) - Total 6,306 645

¹ According to the concession agreement. | ² To receive the total RAP amount. | ³ Land Development: evolution of properties released. 4 Project Development: evolution of all activities related to the project until its energization. | 5 RAP amount of IE Tibagi does not consider adjustments related to the contractual amendment (-13.5%) approved by the Board of ANEEL on 10/26/20. | 6 Partial LI obtained.

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Investments Chg Chg (BRL Million) 4Q20 4Q19 2020 2019 (%) (%) Retroffiting Projects 104.7 61.1 71.4% 231.1 133.1 73.6% Greenfield Projects 280.7 228.3 22.9% 1,074.3 637.8 68.5% Aguapeí 28.2 27.2 3.7% 235.1 76.6 206.9% Aimorés 6.6 34.7 -81.0% 82.0 65.9 24.5% Biguaçu 36.4 1.1 3333.4% 107.5 8.3 1200.5% Itapura 13.1 0.8 1475.3% 49.3 62.3 -20.8% Itaquerê 3.5 44.0 -92.1% 23.4 97.8 -76.0% Itaúnas 9.4 7.4 27.4% 62.4 71.7 -12.9% Ivaí 161.5 20.2 699.2% 379.1 46.2 720.8% Minuano 6.2 0.0 N.A. 10.6 0.0 N.A. Paraguaçu 7.0 64.1 -89.1% 109.0 110.8 -1.7% Tibagi 2.8 28.8 -90.2% 3.6 98.2 -96.4% Três lagoas 1.4 0.0 N.A. 2.1 0.0 N.A. Triângulo Mineiro 4.6 0.0 N.A. 10.1 0.0 N.A. Total 385.4 289.4 33.2% 1,305.4 770.9 69.3%

Note: Considers ISA CTEEP’s 50% interest in non-consolidated subsidiaries

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Attachment II - Sustainability Projects Encouraged by Law Amount Invested (BRL thousand) Culture Incentive Law Culture Incentive Law 1,200 "Abaré Em Cena" 3,125 Forever Environment 480 Enchanted "Balaio" from the Amazon 200 ODS Truck 985 ODS in Schools 999 Sports Incentive Law Training of Public School Teachers 840 Steel Minds Chess 407 Champions of Life 500 Childhood and Adolescence Fund Partnership for Education 1,747 Elderly Fund Entrepreneurship in the Best Age 400 Sustainable Health and Wellness 347 School of Maturity 1,000 Pronon * Precision medicine applied to childhood cancer 1,747 Total 13,977 * National Oncology Care Support Program

* National Cancer Care Support Program

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Attachment III - Regulatory Balance Sheet Assets Consolidated (BRL thousand) 12/31/20 12/31/19 CURRENT Cash and Cash Equivalents 2,067,337 595,971 Financial Investments 453,557 2,068,611 Accounts receivable - Concessionaires and Permissionaires 658,932 256,674 Inventory 22,652 14,942 Services in course 22,259 28,705 Recoverable taxes and contributions 28,807 32,335 Derivative instruments 12,368 19,202 Credit with controlled parties 5,649 703 Prepaid Expenses 6,400 4,677 Restricted cash 1,808 1,876 Others 69,415 41,133 3,349,184 3,064,829 NON-CURRENT Long-Term Assets Restricted cash 46,903 46,515 Accounts receivable - Concessionaires and Permissionaires 498,309 10,679 Accounts Receivable from the State Finance Secretariat 1,778,999 1,576,332 Deferred income taxes and social contribution 0 242 Pledges and Escrow 44,119 52,886 Employee benefits - actuarial surplus 0 43,024 Derivative instruments 226 0 Ongoing service 7,538 0 Others 102,772 1,440 2,478,866 1,731,118 Investments 1,517,335 1,390,300 Imobilized 7,912,308 7,156,235 Intangible 359,753 306,071 9,789,396 8,852,606 12,268,262 10,583,724 Total Assets 15,617,446 13,648,553

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Liabilities and Shareholders' Equity Consolidated (BRL thousand) 12/31/20 12/31/19 CURRENT Loans and Financing 94,628 709,928 Debentures 217,948 367,508 Leasing 81 282 Derivative financial instruments 2,578 0 Suppliers 153,346 167,774 Taxes and social charges to be collected 255,614 92,106 Deferred Income Tax and Social Contribution 0 0 Regulatory charges to be collected 49,457 48,336 Interest on Shareholders' Equity / Dividends to pay 500,513 102,079 Provisions 45,094 33,341 Amounts Payable - Funcesp 871 2,173 Special obligations - Reversal/Amortization 2,480 2,480 Others 43,743 80,152 1,366,353 1,606,159 NON-CURRENT Long-Term Liabilities Loans and Financing 1,208,301 637,448 Debentures 2,961,318 1,528,971 Leasing 18 101 Derivative instruments 0 135 Employee Benefit - Actuarial Deficit 381,978 0 Diferred PIS and COFINS 71,465 0 Deferred income taxes and social contribution 913,557 686,732 Regulatory charges to be collected 48,065 41,236 Provisions 85,736 62,367 Global Reversal Reserve - RGR 14,132 16,612 Obligations connected to concession service 380,135 351,904 Others 54,032 35,652 6,118,737 3,361,158 SHAREHOLDER'S EQUITY Share Capital 3,590,020 3,590,020 Capital Reserves (18,380) 666 Income Reserves 1,192,077 1,192,078 Revaluation reserve 2,136,052 1,899,993 Actuarial surplus -364,659 0 Other Comprehensive Results 140,114 31,191 Accumulated Profits and Losses 1,085,973 0 7,761,197 6,713,948 Non-controlling shareholders' share of investment 371,159 1,967,288 funds 8,132,356 8,681,236 Total Liabilities and Shareholders' Equity 15,617,446 13,648,553

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Attachment IV - Regulatory Income Statement Consolidated Income Statement Chg (BRL thousand) 4Q20 4Q19 2020 2019 Chg (%) (%) Gross Revenue 989,357 852,480 16.1% 4,497,519 3,249,402 38.4% Availability of Electric Network 970,710 844,689 14.9% 4,451,987 3,217,554 38.4% Others 18,647 7,791 139.3% 45,532 31,848 43.0% Deductions from the Operational Revenue (150,363) (123,020) 22.2% (606,338) (474,839) 27.7% Net Revenue 838,994 729,460 15.0% 3,891,181 2,774,563 40.2% Costs and Operational Expenses (335,923) (274,963) 22.2% (1,149,901) (1,158,749) (0.8%) Personnel (96,909) (79,759) 21.5% (326,641) (336,495) (2.9%) Material (7,293) (3,392) 115.0% (18,323) (14,139) 29.6% Services (52,321) (36,223) 44.4% (140,698) (162,030) (13.2%) Depreciation (141,730) (142,114) (0.3%) (562,315) (575,557) (2.3%) Others (37,670) (13,475) 179.6% (101,924) (70,528) 44.5% Result of Service 503,071 454,497 10.7% 2,741,280 1,615,814 69.7% Financial Results (80,333) (46,970) 71.0% (207,983) (186,022) 11.8% Income from Financial Investments 8,279 13,050 (36.6%) 49,247 65,745 (213.5%) Result of Liquid Monetary Variation (42,342) (7,350) 476.1% (74,612) (46,360) (95.0%) Asset and Liability Interest (622) (667) (6.7%) (2,309) (2,120) 8.9% Interest/Charges on loans (46,314) (35,479) 30.5% (167,015) (144,999) 15.2% Others 666 (16,524) (104.0%) (13,294) (58,288) (77.2%) Operational Result 422,738 407,527 3.7% 2,533,297 1,429,792 77.2% Equity Income (32,857) 26,543 (223.8%) (60,434) 69,900 (186.5%) Other Operational Revenues/Expenses (10,641) (1,136) 836.7% 110,592 (9,784) (1230.3%) Results before Taxes 379,240 432,934 (12.4%) 2,583,455 1,489,908 73.4% Income Tax and Social Contribution on (2,956) (83,303) (96.5%) (559,918) (251,258) 122.8% Income Current (34,067) (34,509) (91.4%) (415,955) (276,796) 50.3% Deferred 31,111 (48,794) (30.2%) (143,963) 25,538 (663.7%) Consolidated Income/Losses of the Period with the Participation of the Non 376,284 349,631 7.6% 2,023,537 1,238,650 63.4% Controlling Shareholder Participation of Non Controlling Shareholder (1,840) (4,232) 100.0% (21,147) (16,820) 100.0% Net Income/Loss Consolidated in the Period 374,444 345,399 8.4% 2,002,390 1,221,830 63.9%

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Attachment V - Indirect Cash Flow – Regulatory

Consolidated Cash Flow of operational activities 12/31/20 12/31/19

Cash generated by operational activities 3.133.131 1.946.406 Net Income 2.023.537 1.238.650 Employee benefit - actuarial deficit 15.368 0 Deferred PIS and COFINS 71.465 0 Depreciation and amortization 573.048 575.557 Deferred income taxes and social contribution 153.387 (25.538) Provision for Lawsuit Liabilities 8.085 (13.940) Residual value of fixed/intangible assets 40.234 21.894 Tax benefit - incorporated goodwill 37 36 Realization of concession assets in the acquisition of subsidiary (6.531) 2.390 Realization of the loss in jointly controlled (1.812) (1.966) Result of equity income 60.434 (69.900) Equity Income (4.437) 0 Interest and exchange variations due on assets and liabilities 200.316 219.223 Assets Variation (1.210.110) (124.023) Restricted cash (156) (4.336) Accounts receivable - Concessionaires and Permissionaires (889.884) 14.144 Inventories (7.710) 5.423 Accounts Receivable from the State Finance Secretariat (202.667) (150.249) Recoverable taxes and contributions 3.528 (2.814) Prepaid Expenses (1.723) 3.707 Pledges and Escrow 9.856 16.328 Services in course (3.890) (13.826) Credit with subsidiaries 9.387 (8.863) Others (126.851) 16.463 Liabilities Variation 185.567 182.450 Suppliers (14.428) 79.161 Taxes and social charges to be collected 163.522 37.762 Labor obligations 11.753 (3.706) Regulatory charges to be collected 6.665 10.675

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Provisions 11.778 (22.033) Amounts Payable - Funcesp (1.302) (2.077) Global Reversal Reserve - RGR (2.480) (2.481) Obligations related to concession of service 28.091 36.733 Others (18.032) 48.416 Net cash generated in operational activities 2.108.588 2.004.833

Investments Activites Cash Flow (936.760) (508.948) Financial Investments (1.744.485) 348.708 Redemptions of financial investments 1.767.685 0 Fixed Assets (758.153) (687.532) Investments (221.501) (185.000) Received dividends 19.694 14.876 Cash used in financing activities 299.538 (916.654)

New loans 2.255.516 509.515

Loan payments (principal) (1.263.352) (337.234)

Loan payments (interest) (167.144) (169.700)

Lease Payments (principal and interest) (308) 0

Lease Payments (interest) 0 0

Transactions with non-controlling shareholders (21.147) (16.820) Derivative instruments 243.342 (1.701) Paid dividends and interest on equity (747.369) (900.714) Net variation in Cash and Cash Equivalents 1.471.366 579.231 Opening Balance of Cash and Cash Equivalents 595.971 16.740 Closing Balance of Cashand Cash Equivalents 2.067.337 595.971 Closing Balance of Cash and Cash Equivalents 1.471.366 579.231

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Attachment VI - Regulatory Results of Non-Consolidated Subsidiaries (IE Madeira and IE Garanhuns)

IE MADEIRA Income Statement 4Q20 4Q19 Chg (%) 2020 2019 Chg (%) (BRL million)

Gross Operational Revenue 152,678 145,172 5.20% 611,111 546,755 11.8% Operational Revenue Deductions -20,831 -19,172 8.70% -91,037 -73,043 24.6% Net Operational Revenue 131,848 126,000 4.60% 520,075 473,712 9.8% Costs and Expenses -13,485 -12,589 7.10% -36,970 -74,694 -50.5% Depreciation -121,801 -33,859 259.70% -223,303 -135,462 64.8% EBITDA 118,287 113,552 4.20% 483,229 399,000 21.1% Gross Profit -3,438 79,552 -104.30% 259,802 263,556 -1.4% Financial Result -51,127 -41,438 23.40% -329,725 -149,491 120.6% Other Revenues and Expenses -75.3 141 -153.40% 124.7 -18 -792.8% Income before IR & CSLL -54,641 38,255 -242.80% -69,799 114,047 -161.2% IR & CSLL* -1,930 7,573 -125.50% -6,557 -301 2078.2% Net Income -56,571 45,828 -223.40% -76,356 113,746 -167.1%

ISA CTEEP Participation (51%) on EBITDA 60,326 57,911 28.20% 246,447 203,490 27.8% ISA CTEEP Participation (51%) on Net Revenue -28,851 23,372 96.70% -38,941 58,010 -129.1%

IE GARANHUNS Income Statement 4Q20 4Q19 Chg (%) 2020 2019 Chg (%) (BRL million) Gross Operational Revenue 27,875 26,200 6.4% 105,961 95,501 11.0% Operational Revenue Deductions -3,579 -3,813 -6.1% -13,820 -13,818 0.0% Net Operational Revenue 24,296 22,387 8.5% 92,141 81,683 12.8% Costs and Expenses -11,930 -3,633 228.4% -21,226 -15,262 39.1% Depreciation -6,258 -6,271 -0.2% -25,015 -24,967 0.2% EBITDA 21,202 26,724 -20.7% 79,294 74,391 6.6% Gross Profit 6,108 12,483 -51.1% 45,900 41,454 10.7% Financial Result -2,763 -3,594 -23.1% -11,573 -14,506 -20.2% Other Revenues and Expenses 8,836 7,970 10.90% 8,379 7,970 5.1% Income before IR & CSLL 12,181 16,859 -27.8% 42,706 34,918 22.3% IR & CSLL* -391.8 -7,309 -94.6% -1,470 -5,616 -73.8% Net Income 11,789 9,550 23.4% 41,236 29,302 40.7%

ISA CTEEP Participation (51%) on EBITDA 10,813 13,629 44.8% 40,440 37,939 21.9% ISA CTEEP Participation (51%) on Net Revenue 6,012 4,871 60.8% 21,030 14,944 49.1% (*) Has an infrastructure project consisting of transmission lines and an electricity substation operating in areas where SUDENE operates, whose benefit was granted in December 2016. The period for enjoying the tax benefit, which is a 75% reduction in income tax and surcharges, is 10 years.

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Attachment VII - Breakdown of Consolidated Debt (BRL thousand)

Funding Charges Maturity 12/31/2020 12/31/2019 TJLP + 1.80% per year 03/15/29 159.1 178.2 BNDES 3.50% per year 01/15/24 31.5 41.7 TJLP + 2.62% per year 03/15/32 218.9 234.1 CTEEP -

Debentures 4th Issuance IPCA + 6.04% 07/15/21 176.5 168.5 5th Issuance IPCA + 5.04% 02/15/24 352.5 336.9 6th Issuance 105,65% of CDI a.a. 12/13/2020 - 350,4 7th Issuance IPCA + 4.70% 04/15/25 682.0 651.0 8th Issuance IPCA + 3.50% 12/15/29 407.0 389.6 9th Issuance CDI + 2,83% 11/15/28 795.7 0.0 9th Issuance IPCA + 5,3000 per year 05/15/44 765.5 0.0 CTEEP - Others VC + 3.34% per year + Law 4,131 - MUFG 07/20/20 - 306.1 IR VC + Libor 3M + 0.47% Law 4,131 - Citibank 08/24/20 - 302.4 per year + IR VC + Libor 3M + 0.25% Law 4,131 - Citibank 11/08/19 - - per year + IR CCB CDI + 2.45% per year 04/20/22 653.3 - CTEEP Total Gross 4,242.0 2,959.0 Debt Funding Charges Maturity 12/31/2020 12/31/2019 TJLP + 2.06% per year 02/15/28 3.9 4.5 3.5% per year 04/15/23 4.2 6.0 PINHEIROS TJLP + 2.62% per year 05/15/26 19.5 23.3 5.5% per year 01/15/21 0.8 10.9 TJLP + 1.95% per year 05/15/26 20.9 24.7 SERRA DO JAPI TJLP + 1.55% per year 05/15/26 18.0 21.4 IEMG TJLP + 2.39% per year 04/15/23 12.3 17.6 IE SUL 5.5% per year 01/15/21 0.1 1.2 TJLP + 2.58% per year 05/15/25 3.4 4.1 3.0% per year 04/15/23 2.8 4.0 TJLP + 2.58% per year 02/15/28 5.9 6.8 IENNE 8.5% per year 05/19/30 148.2 160.3 Subsidiaries Total 240.2 284.8 Gross Debt Consolidated Total Gross Debt (BRL 4,482.1 3,243.8 thousand) 44

Infrastructure Debentures BNDES (4th and 5th issuance) (annual verification) (quarterly verification)

Net Debt 12/31/2020 3,375 Net Debt 12/31/2020 2,015

EBITDA last 12 months 2,796 EBITDA last 12 months 2,517

Net Debt/EBITDA 12/31/2020 1.21 Net Debt/EBITDA 12/31/2020 0.80

Shareholders' Equity 12/31/2020 Financial Result 12/31/2020 209 14,125 Net Debt/Net Debt + Shareholders' 0.19 EBITDA/Financial Result 12/31/2020 12.03 Equity 12/31/2020

The main covenants that ISA CTEEP must comply with are: The financing agreements with BNDES (valid until the expiry of the agreement in 2032) must meet the following maximum financial indicators: Net Debt/BNDES Adjusted EBITDA ≤ 3.0 and Net Debt/(Net Debt + Shareholders’ Equity) ≤ 0.6 at the end of each fiscal year. For the purposes of calculating and substantiating these indices, the Company must consolidate all subsidiaries and non-consolidated subsidiaries3 (in proportion to their interest), provided its interest is 10% or higher. The 4th issue of debentures must meet the quarterly calculation frequency and the financial indicators established in the indenture: Net Debt/EBITDA < 3.5 and EBITDA/Financial Result > 1.5 until the baseline date of June 30, 2017 and after the baseline date of September 30, 2017, the indicator is > 2.0. EBITDA is calculated according to the methodology defined in the agreement. The 5th issue of debentures requires compliance with the indicators established in the indenture, to be verified on a quarterly basis: Net Debt/EBITDA < 3.5 and EBITDA/Financial Result > 1.5 until the baseline date of June 30, 2017 and after the baseline date of September 30, 2017, the indicator is > 2.00. EBITDA is calculated according to the methodology defined in the agreement.

3 IE Madeira, IE Garanhuns, IE Aimorés, IE Paraguaçu and IE Ivaí 45

Attachment VIII - Breakdown of Debt of Non-Consolidated Subsidiaries - IE Madeira, IE Garanhuns and IE Ivaí (BRL thousand)

Amount Total Amount Final Company Bank Charges guaranteed by Owed Maturity ISA CTEEP 12/31/2020

ITAÚ IPCA + 5.5% per year 03/18/2025 222.9 437.1

BNDES TJLP + 2.42% per year 02/15/2030 512.4 1,004.6 IE MADEIRA 51% ISA BNDES TJLP 02/15/2030 3.6 7.0 CTEEP BNDES 2.5% per year 10/15/2022 34.8 68.2

BASA 8.5% per year 10/10/2032 151.1 296.3

Gross Debt 924.7 1,813.2

Availability 186.3 365.3

Net Debt 738.4 1,447.9

BNDES TJLP + 2.05% per year 12/15/2028 68.5 134.3 IE GARANHUNS 51% ISA BNDES 3.50% per year 08/15/2023 26.3 51.5 CTEEP BNDES TJLP 12/15/2028 0.5 1.0

Gross Debt 95.2 186.7

Availability 7.4 14.6

Net Debt 87.8 172.1

IE IVAÍ 50% ISA ITAÚ BBA IPCA + 5.0% per year 12/15/2043 863.8 1,693.7 CTEEP

Gross Debt 863.8 1,693.7

Availability 519.8 1,039.6

Net Debt 344.0 654.1

TOTAL Gross Debt 1,883.7 3,693.6

TOTAL Net Debt 1,170.2 2,274.2

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Attachment IX - Balance Sheet - IFRS Assets Consolidated (BRL thousand) 12/31/2020 12/31/2019 CURRENT Cash and cash equivalents 2,067,337 595,971 Financial investments 453,557 2,068,611 Concession Asset 2,804,373 2,061,882 Inventories 45,297 103,818 Taxes and contributions to compensate 28,807 32,335 Derivative instruments 9,790 19,202 Credit with related parties 14,994 703 Prepaid expenses 6,400 4,677 Restricted Cash 1,808 1,876 Others 75,495 44,373 5,507,858 4,933,448 NON-CURRENT Long-term Receivables Restricted Cash 46,903 46,515 Concession Asset 14,118,454 12,599,151 Accounts Receivable from the State Finance Secretariat 1,778,999 1,576,332 Deferred income taxes and social contribution 0 1,144 Pledges and Escrow 44,119 52,886 Inventories 9,997 13,006 Employee benefits - actuarial surplus 0 43,024 Derivative instruments 226 0 Others 110,310 24,011 16,109,008 14,356,069 Investments 2,858,002 2,198,004 Imobilized 92,991 86,377 Intangible 24,499 25,196 2,975,492 2,309,577 19,084,500 16,665,646 Total Assets 24,592,358 21,599,094

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Liabilities and Shareholders' Equity Consolidated (BRL thousand) 12/31/2020 12/31/2019 CURRENT Loans and financing 94,628 709,928 Debentures 217,948 367,508 Leasing 8,795 9,948 Derivative instruments 0 0 Suppliers 153,346 167,774 Taxes and social charges to be collected 255,614 92,106 Regulatory Charges to be collected 49,457 48,336 Interest on Shareholders' Equity / Dividends payable 500,513 102,079 Labor obligations 45,094 33,341 Amounts Payable - Vivest 871 2,173 Special obligations - Reversal/Amortization 2,480 2,480 Others 43,751 80,152 1,372,497 1,615,825 NON-CURRENT Long-term Liabilities Loans and financing 1,208,301 637,448 Debentures 2,961,318 1,528,971 Leasing 44,742 39,948 Derivative instruments 0 135 Benefit to employess - Actuarial Deficit 381,977 0 Deferred PIS and COFINS 1,316,722 1,185,323 Deferred Income Tax and Social Contribution 2,952,855 2,673,970 Regulatory Charges to be collected 48,065 41,236 Provisions 88,682 62,367 Global Reversal Reserve - RGR 14,132 16,612 Others 77,625 35,652 Total long-term liabilities 9,094,419 6,221,662 NET EQUITY Shareholders' Equity 3,590,020 3,590,020 Capital Reserves 666 666 Profits Reserve 9,863,692 8,172,442 Actuarial Surplus (364,659) 0 Other comprehensive results 140,114 31,191 Additional proposed dividends 524,450 0 13,754,283 11,794,319 Non-controlling shareholders' share of investment funds 371,159 1,967,288 14,125,442 13,761,607 Total Liabilities and Shareholders' Equity 24,592,358 21,599,094

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Attachment X – Income Statement – IFRS

Income Statement Consolidated (BRL thousand) 4Q20 4Q19 Chg (%) 2020 2019 Chg (%) Gross Operational Revenue 382,214 1,018,898 -62.5% 4,240,994 3,815,465 11.2% Infrastructure Revenue 583,719 411,855 41.7% 1,135,533 808,525 40.4% O&M Gross Revenue 332,142 297,668 11.6% 1,071,126 1,108,520 -3.4% Efficiency Gain in Infrastructure Implementation 152,998 464,490 -67.1% 152,998 464,490 -67.1% Remuneration of concession assets -694,981 -162,906 326.6% 1,846,116 1,402,082 31.7% Other Revenues 8,336 7,791 7.0% 35,221 31,848 10.6% Deductions from Operational Revenue -80,936 -115,950 -30.2% -544,567 -483,603 12.6% Net Operational Revenue 301,278 902,948 -66.6% 3,696,427 3,331,862 10.9% Operational Costs and Expenses -423,977 -309,897 36.8% -1,389,503 -1,147,296 21.1% Personnel -100,926 -82,017 23.1% -341,226 -347,353 -1.8% Materials -104,994 -127,574 -17.7% -455,907 -388,296 17.4% Services -155,094 -82,129 88.8% -411,876 -316,346 30.2% Depreciation -5,505 -4,547 21.1% -19,791 -19,963 -0.9% Others -57,458 -13,630 321.6% -160,703 -75,338 113.3% Revenues – Periodic Tariff Reset (RTP) 1,477,622 -26,707 -5632.7% 1,477,622 -26,707 -5632.7% Service Income 1,354,923 566,344 139.2% 3,784,546 2,157,859 75.4% Financial Income -77,482 -46,421 66.9% -209,175 -185,259 12.9% Income from Financial Investments 8,279 13,050 -36.6% 49,247 65,745 -25.1% Result of Liquid Monetary Variation -42,922 -7,350 484.0% -75,192 -46,360 62.2% Interest costs -622 -667 -6.7% -2309 -2120 8.9% Interest/Charges on loans -43,062 -36,423 18.2% -168,345 -147,222 14.3% Others 845 -15,031 -105.6% -12,576 -55,302 -77.3% Operational Result 1,277,441 519,923 145.7% 3,575,371 1,972,600 81.3% Equity Income 472,827 50,120 843.4% 472,525 179,788 162.8% Other Operating Revenues/Expenses 23,368 -107 -21939.3% 170,171 3,525 4727.5% Earnings Before Taxes 1,773,636 569,936 211.2% 4,218,067 2,155,913 95.7% Income tax and Social Contribution on -175,216 -49,976 250.6% -835,417 -376,462 121.9% Earnings Current -34,067 -34,509 -1.3% -415,955 -276,796 50.3% Deferred -141,149 -15,467 812.6% -419,462 -99,666 320.9% Consolidated Profit/Loss for the Period before 1,598,420 519,960 207.4% 3,382,650 1,779,451 90.1% Non-Controlling Shareholder's Stake Non-Controlling Shareholder's Stake -1,840 -4,232 -56.5% -21,147 -16,820 25.7% Consolidated Profit/Loss for the Period 1,596,580 515,728 209.6% 3,361,503 1,762,631 90.7%

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Attachment XI –Cash Flow - IFRS (BRL thousand) Consolidated Cash Flow from Operations 12/31/20 12/31/19 Cash flow from operational activities 3,725,053 1,938,420 Net earnings 3,382,650 1,779,451 Employee benefit - actuarial deficit 15,368 0 Deferred PIS and COFINS 131,399 8,757 Depreciation and amortization 19,791 19,963 Deferred income taxes and social contribution 419,462 99,666 Lawsuit Liabilities 34,793 (13,940) Residual cost of imobilized/intangible asset 659 2,402 Tax benefit - incorporated goodwill 37 36 Realization of concession assets in the acquisition of subsidiary 2,491 2,490 Realization of the loss in jointly controlled (7,900) (1,966) Result of equity income (472,525) (179,789) Equity income (4,437) 0 Interest and exchange variations due on assets and liabilities 203,265 221,350 Asset Variations (2,515,276) (733,440) Restricted cash (156) (4,336) Concession asset (2,253,894) (525,212) Inventories 61,529 (64,099) Accounts Receivable from the State Finance Secretariat (202,667) (150,249) Recoverable taxes and contributions 3,528 (2,814) Prepaid expenses (1,723) 3,707 Pledges and Escrows 9,856 16,328 Credit with subsidiaries (14,292) (124) Others (117,457) (6,641) Liabilities Variations 152,327 145,717 Suppliers (14,428) 79,161 Taxes and social charges to be collected 163,522 37,762 Labor obligations 11,753 (3,706) Regulatory charges to be collected 6,662 10,675 Provisions (14,925) (22,033) Amounts Payable - Vivest (1,302) (2,077) Pledges and Liens (2,480) (2,481) Others 3,525 48,416 Net Cash from Operating Activities 1,362,104 1,350,697 Investments Activites Cash Flow (177,309) 157,179 Financial investments (1,744,485) 348,708 Redemptions of financial investments 1,767,685 - Imobilized (7,525) (18,534) Intangible (5,511) (2,871) Investments (207,166) (185,000) Received dividends 19,693 14,876 Cash used in financing activities 286,571 (928,645) Addition to loans and debentures 2,255,516 509,325 Loan payments (principal) (1,263,352) (336,849) Loan payments (interest) (167,144) (169,721) Leasing Payments (principal and interest) (13,275) (12,208) Leasing Payments (interest) 0 43 50

Transactions with non-controlling shareholders (21,147) (16,820) Derivative instruments 243,342 (1,701) Paid dividends and interest on equity (747,369) (900,714) Net variation in Cash and Cash Equivalents 1,471,366 579,231 Opening Balance of Cash and Cash Equivalents 595,971 16,740 Closing Balance of Cashand Cash Equivalents 2,067,337 595,971 Cash and cash equivalents 1,471,366 579,231

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Attachment XII –EBITDA IFRS vs. Regulatory (BRL thousand)

Consolidated 4Q20 4Q19 Chg (%) 2020 2019 Chg (%) EBITDA IFRS (ICVM 527) 1,857.3 621.5 198.8% 4,449.6 2,363.7 88.2% (-) Infrastructure implementation revenue (583.7) (180.7) 223.1% (1,135.5) (577.4) 96.7% (-) Concession assets remuneration 523.7 (381.6) -237.2% (1,804.2) (1,583.2) 14.0% (-) Efficiency gains in infrastructure implementation 18.3 (151.1) n.a. (153.0) (514.5) -70.3% (-) O&M Revenue (332.1) (297.7) 11.6% (1,113.1) (1,108.5) 0.4% (+) Electric network use revenue 970.7 844.7 14.9% 4,452.0 3,217.6 38.4% (+) Deferred PIS and COFINS (69.4) (7.1) 882.0% (61.8) 8.8 -804.8% (+) Infrastructure implementation cost 213.4 170.4 25.3% 739.4 548.1 34.9% (-) O&M Cost 10.1 1.2 747.8% 9.9 (4.1) -343.3% (-) General and Administrative expenses 11.1 1.0 1061.5% 43.1 0.1 43024.6% (-) Equity Income (505.7) (23.6) 2045.2% (533.0) (109.9) 385.0% (-) Revenue – Periodic Tariff Reset (RTP) (1,477.6) 26.7 n.a. (1,477.6) 26.7 -5634.2% (-) Other operational revenues (expenses) (34.0) (1.1) 139959.0% (59.7) (13.4) 345.0% REGULATORY EBITDA (ICVM 527) 601.9 622.6 -3.3% 3,356.2 2,253.9 48.9% Equity Income 32.9 (26.5) -223.8% 60.4 (69.9) -186.5% PA of RTP and RBSE 0.0 0.0 0.0% (871.1) 0.0 n.a. PA (RTP and RBSE) retroactive receipt 72.6 0.0 n.a. 145.2 0.0 n.a. Non-recurring costs and expenses¹ 15.7 (1.0) n.a. 25.6 29.5 -13.3% ADJUSTED EBITDA 723.1 595.1 21.5% 2,716.3 2,213.5 22.7%

¹Growth projects, COVID-19-related expenses and donations, lawyers’ fees, tax assessment notice and others

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