REPUBLIC OF

Ministry of Economy and Energy

METHODOLOGY

FOR THE

OPERATION OF

THE ENERGY EFFICIENCY OBLIGATION SCHEMES

Sofia

5 December 2013 REPUBLIC OF BULGARIA MINISTRY OF ECONOMY AND ENERGY

The methodology for the operation of the energy efficiency obligation schemes has been developed in accordance with the requirements of Article 7 of Directive 2012/27/EU on energy efficiency. This national methodology has been drawn up in line with the framework provided in paragraph 4 of Annex V to the Directive.

This methodology was developed by a team of experts from Bulgaria’s Ministry of Energy and Economy and the Sustainable Energy Development Agency.

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TABLE OF CONTENTS

1. OBLIGATED, PARTICIPATING OR ENTRUSTED PARTIES OR IMPLEMENTING PUBLIC AUTHORITIES ...... 4 2. TARGET SECTORS ...... 5 3. THE LEVEL OF THE ENERGY-SAVING TARGET OR EXPECTED SAVINGS DURING THE WHOLE OR INTERMEDIATE PERIODS ...... 6 4. THE DURATION OF THE OBLIGATION PERIOD AND INTERMEDIATE PERIODS ...... 7 5. ELIGIBLE MEASURE CATEGORIES ...... 8 6. CALCULATION METHODOLOGY, INCLUDING HOW ADDITIONALITY AND MATERIALITY ARE TO BE DETERMINED AND WHICH METHODOLOGIES AND BENCHMARKS ARE USED FOR ENGINEERING ESTIMATES ...... 9 7. LIFETIMES OF MEASURES ...... 11 8. APPROACH TAKEN TO ADDRESS CLIMATIC VARIATIONS WITHIN THE MEMBER STATE ...... 15 9. QUALITY STANDARDS ...... 19 10. AUDIT PROTOCOLS ...... 20 11. HOW THE NEED TO FULFIL THE REQUIREMENT IN THE SECOND SUBPARAGRAPH OF ARTICLE 7(1) IS TAKEN INTO ACCOUNT ...... 23 ANNEX: LIST OF REGULATORY DOCUMENTS ...... 24

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1. Obligated, participating or entrusted parties or implementing public authorities

When designating the obligated parties, Bulgaria considers it necessary to include all energy distributors and/or retail energy sales companies, including transport fuel distributors and transport fuel retailers. Obligated parties shall be energy traders that meet one or more of the following conditions: 1. Sales of energy to final customers in the previous calendar year that were greater than the equivalent of 75 GWh (6.45 ktoe) annually, including: • Electricity companies selling electricity to final customers in amounts exceeding 75 GWh on an annual basis; • Heat transmission companies selling heating to final customers in amounts exceeding 75 GWh on an annual basis; • Natural gas traders selling more than 8 million normal cubic meters on an annual basis to final customers; • Liquid fuel traders selling liquid fuels to final customers in amounts exceeding 6 500 tonnes on an annual basis, excluding fuels for transport purposes; • Solid fuel traders selling to solid fuels to final customers in amounts exceeding 13 000 tonnes on an annual basis; 2. A minimum of 10 members of staff in the previous year, irrespective of the amount of energy traded; 3. Annual turnover or end-of-year balance for the previous year of more than BGN 3.9 million, irrespective of the amount of energy traded.

Bulgaria does not intend to include transport fuel distributors or retailers in the obligation scheme.

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2. Target sectors

In order to reach their individual targets, the obligated parties may implement energy-saving measures in all final customer sectors — industry, transport, households, commerce, civil society organisations, agriculture, forestry and fishery, services, etc. The obligated parties may implement measures that achieve energy savings in the energy transformation, distribution and transmission sectors, including by means of efficient district heating and cooling systems infrastructure.

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3. The level of the energy-saving target or expected savings during the whole or intermediate periods

In accordance with Article 7 of Directive 2012/27/EU, Table 1 shows the energy sales to final customers (equivalent to final energy consumption (FEC)) in the three-year period from 2010 to 2012, based on the available data from the National Statistical Institute, and the average sales levels in the same period, excluding all sales to the transport sector.

Table 1. Average energy sales to final users in the period 2010-2012, ktoe

Indicator 2010 2011 2012 Average FEC excl. transport 5 990 6 337 6 173 6 167

In the period 2014-2020, the minimum combined amount of energy savings achieved by all energy traders must include new energy savings equal to 1.5 % of the annual amount of energy sold to all final customers. The obligations calculated for each year, both with and without full use of the 25 % reduction permitted by Article 7(2), are given in Table 2.

Table 2. Breakdown of the obligation scheme by year (2014-2020), ktoe

Year Obligations excl. transport Obligations excl. transport and with full use of the 25 % reduction permitted by Article 7(2) 2014 92.50 69.38 2015 185.00 138.75 2016 277.50 208.13 2017 370.00 277.50 2018 462.50 346.88 2019 555.00 416.25 2020 647.50 485.63

As shown in the third column of the table, Bulgaria intends to make full use of the 25 % reduction permitted by Article 7(2).

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4. The duration of the obligation period and intermediate periods

In accordance with the requirements of Article 24(2) of Directive 2012/27/EU on energy efficiency, by 30 April 2014, and every three years thereafter, Member States shall submit National Energy Efficiency Action Plans. We therefore consider it appropriate to phase in the obligation periods according to the following timetable: 1. First period: 2014-2016; 2. Second period: 2017-2019; 3. Third period: 2020.

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5. Eligible measure categories

The eligible measures to increase energy efficiency must satisfy the following conditions:

1. Their payback time must not be longer than the lifetime of the corresponding measures; 2. They must save primary energy resources; 3. They must reduce greenhouse gas emissions; 4. They must not damage the quality of the environment; 5. They must not damage sanitary and hygiene elements.

In order to reach their targets, the obligated parties may implement horizontal measures aimed at increasing the energy efficiency of final customers, such as awareness and promotional campaigns. They may also pay contributions to the Energy Efficiency and Renewable Sources Fund or other specialised funds, programmes, measures, schemes and mechanisms used to finance measures to increase the energy efficiency of final customers, including agreements concluded with beneficiaries.

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6. Calculation methodology, including how additionality and materiality are to be determined and which methodologies and benchmarks are used for engineering estimates

In 2012, 11 energy-saving assessment methodologies were drawn up and adopted. Each of these was based on the principle of enabling the energy savings to be measured and/or estimated before and after the implementation of the energy efficiency measure concerned. It is also possible to adjust and standardise the results in order to accommodate the effect of internal or external conditions that may influence energy consumption. These encompass the likely impact of one or more probable factors, such as weather conditions, heating or air conditioning, type of equipment used, etc. The specific methodologies are used to assess the amount of energy saved as a result of the implementation of specific energy efficiency measures. They include a mechanism to allocate energy savings to each year of the lifetime of the measure concerned. The specific methodologies are based on:

1. Measurements, including a definition of: a) Measurement points and intervals, types of measuring devices, measurement reports; b) Measurement methods, techniques and additional equipment used; c) Accuracy and measurement procedures to ensure the necessary quality of measurements; d) Forms used for reporting and documenting the results;

2. Engineering calculations and estimates, including a definition of: a) Preconditions and assumptions; b) Characteristics of the site and the types of energy efficiency measures to be assessed; c) Climate data and other external and internal factors to be used in the engineering analysis.

The methodologies take a ‘bottom up’ approach. This enables the energy saved to be determined by measuring and/or calculating energy consumption before and after implementation of the measures concerned, having made standardised adjustments based on the impact of the specific climate conditions on energy use. The energy savings are calculated and measured in kilograms of oil equivalent (kgoe) or kilowatt hours (kWh).

This method can be applied to individual measures and groups of measures in order to ‘capture’ and report the energy-saving effect of each individual measure or programme. Its

METHODOLOGY FOR THE OPERATION OF THE ENERGY EFFICIENCY OBLIGATION SCHEMES 9/24 REPUBLIC OF BULGARIA MINISTRY OF ECONOMY AND ENERGY accuracy depends on that of the measurements and on the selection of adequate input and follow-up values and/or parameters.

‘Bottom-up’ calculation methods can reflect past activities, where the entire saving achieved by a single participant or piece of equipment is the starting point of the calculation process. The total savings achieved by a given measure or programme is the sum total of the combined savings achieved by all participants in and/or beneficiaries of the measure or programme concerned.

This method ensures that energy savings from combinations of energy efficiency measures or mechanisms are not counted twice.

To assess the energy savings from energy efficiency measures alone, the impact of the following variable factors on energy consumption must be eliminated:

1. Climate conditions (expressed as cumulative degree days); 2. Occupancy levels; 3. Working hours in non-residential buildings; 4. Utilisation of installed capacities and production structure; 5. Output, added value, changes in GDP; 6. Installation and transportation schedules; 7. Links to other units, etc.

Once implemented, certain measures can have a multiplier effect, i.e. their implementation continues automatically at other sites without any involvement of the persons responsible. In the majority of cases, these measures are more cost-efficient than ad hoc measures and should be continued on a regular basis. The multiplier effect may be included when assessing the potential of the measures. In such cases, it is necessary to verify the combined energy-saving effect and apply adjustment factors in the subsequent assessment.

Energy efficiency indicators may be used to assess horizontal measures or measures that cover several sectors at once as long as it is possible to determine how those indicators would change in the future if the measures were not implemented. In such cases, it is necessary to ensure that energy savings achieved by energy efficiency programmes, energy services and other tools (such as energy or carbon dioxide taxes and awareness campaigns) are not counted twice. Appropriate adjustments should be applied where it is not possible to avoid this duplication.

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7. Lifetimes of measures

The table below sets out the eligible energy efficiency measures within their harmonised and non-harmonised lifetimes. Measures whose lifetimes are not given in Table 3 must be justified, in accordance with the provisions laid down in the national energy efficiency legislation (see Annex).

Table 3: Lifetime of energy efficiency measures

Lifetime (years) No Measures to increase energy efficiency Harmonised Non-harmonised lifetimes lifetimes I. Household Sector I.1. Technical measures 1. Insulation: building envelope; façade insulation 30 Insulation: building envelope; roof/basement 2. 20 insulation Seal-off gaps around window/door frames to 3. 5 increase the air-tightness of the building 4. Glazing: glazing with good insulation 30 Replace hot water storage tank: install new foam- 5. 15 insulated tank Insulate hot water pipes: apply insulation material 6. 20 to concealed hot water pipes Reflective radiator panels: apply insulating material 7. between the radiators and walls to reflect heat back 18 into the space Small combustion boilers: individual, with an 8. 20 installed capacity of less than 30 kW Large combustion boilers: individual or co-owned, 9. 25 with an installed capacity of more than 30 kW Heat control: control by timers, thermostats or 10. 5 thermostatic valves Waste heat utilisation systems: install heat 11. 17 utilisation and circulation systems 12. Hot water saving valves: valves with flow controls 15 13. Heat pumps (households): air to air 10 14. Heat pumps (households): spent air to water 15 15. Ground source heat pumps 25

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Efficient chillers or room air conditioners: energy- 16. 10 efficient domestic air conditioners. 17. New and/or improved central heating system 20 18. Solar water heating: solar water heaters 20 Efficient refrigerating appliances: high efficiency 19. 15 domestic refrigerators and freezers Efficient domestic appliances: high efficiency 20. dishwashers, washing machines and tumble driers 12 for household use Electronic appliances with high energy efficiency: 21. 3 household electronics, TV, DVD, computers, etc. 22. Energy-efficient lamps for household use (6 000 h) 23. Energy-efficient lighting fixtures and start systems 15 Energy-efficient architecture: designs that optimise the thermal properties of building materials, 24. 25 orientation of buildings towards natural light and heat sources, use of natural ventilation, etc. 25. Smart heat and electricity measuring systems 26. Small cogeneration plants for household use 15 27. Photovoltaic solar panels 23 I.2. Organisational measures Hydraulic heat balancing: optimised balancing 28. between individual rooms within household heat 10 systems I.3. Behavioural measures Electricity saving: electricity saving behaviour: 29. switch off unnecessary lights, turn off domestic and 2 electronic appliances Heat saving: heat saving behaviour: turn off or turn 30. 2 down superfluous heat sources Data from smart measuring devices providing users 31. with sufficient information to allow them to 2 optimise their consumption II. Services Sector II.1. Technical measures 32. Glazing: glazing with good insulation 30 Building envelope insulation: building envelope, 33. 25 façade insulation Waste heat utilisation systems: install heat 34. 20 utilisation and circulation systems

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Energy-efficient architecture: designs that optimise the thermal properties of building materials, 35. 25 orientation of buildings towards natural light and heat sources, use of natural ventilation, etc. 36. Heat pumps: air to air 10 37. Heat pumps: spent air to water 15 38. Ground source heat pumps 25 39. Energy-efficient chillers or air conditioning systems 17 40. Energy-efficient ventilation systems 15 41. Commercial refrigerators 8 Energy-efficient office equipment: computers, 42. 3 printers, fax machines, copiers 43. Cogeneration of heat and electricity 8 44. Lighting control sensors 10 45. Energy-efficient office lighting systems 12 46. Energy-efficient public lighting systems 13 Energy-efficient combustion boilers with a capacity 47. 25 of more than 30 kW II.2. Organisational measures 48. Energy management 2 III. Transport Sector III.1. Technical measures 49. Energy-efficient vehicles (100 000 km) 50. Low-resistance tyres for passenger vehicles (50 000 km) 51. Low-resistance tyres for goods vehicles (100 000 km) 52. Aerodynamic devices for heavy goods vehicles (500 000 km) Tyre pressure control in goods vehicles: automatic 53. (500 000 km) tyre pressure control devices Fuel additives designed to increase engine 54. 2 efficiency III.2. Organisational measures Substitute transport means with a more energy- 55. 2 efficient type III.3. Behavioural measures 56. Advanced fuel consumption controllers in vehicles 2 57. Optimum tyre pressure 1 Environment-friendly driving to reduce fuel 58. 2 consumption IV. Industrial Sector

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IV.1. Technical measures 59. Cogeneration of heat and electricity 8 60. Waste heat utilisation 15 Energy-efficient compressed air systems: use new 60. energy-efficient compressors or increase the 15 efficiency of existing ones 62. Energy-efficient electric motors and stepless drives 10 Energy-efficient pump systems in industrial 63. 15 processes IV.2. Organisational measures 64. Energy management and monitoring 2 V. Measures encompassing several sectors Standards and regulations aimed at improving 65. energy efficiency 66. Energy labelling schemes Measuring and smart measuring systems, such as 67. remote-controlled individual consumption meters with detailed billing information Training and education to encourage use of energy- 68. efficient technologies and/or techniques 69. Energy audits VI. Horizontal measures Regulations and taxes that reduce final energy 70. consumption Awareness campaigns to promote greater energy 71. efficiency and energy efficiency measures

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8. Approach taken to address climatic variations within the Member State

The baseline values of the climate factors needed to calculate the duration of the heating period and degree days in populated areas have been determined for nine climate zones across the country, as shown in Figure 1 and Table 4:

Figure 1: Climatic zoning of Bulgaria

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Table 4: Duration of heating period and degree days (DD) by populated area

Number of Number of heat heat days tHP DD at: DD at: days tHP at: No Place at: e  12C e  12C

i, H = 19C i, H = 17C 1. Aitos 175 2 400 175 2 030 2. 180 2 500 180 2 140 3. 170 2 400 167 2 060 4. 180 2 400 180 2 040 5. 195 3 000 195 2 610 6. 195 3 000 195 2 610 7. 170 2 400 170 2 060 8. 180 2 800 180 2 440 9. 190 2 800 190 2 420 10. 210 3 200 210 2 780 11. 170 2 300 170 1 960 12. Byala 175 2 700 175 2 350 13. 175 3 000 175 2 650 14. Varna 180 2 400 180 2 040 15. 200 3 300 200 2 860 16. 185 2 800 185 2 430 17. 180 2 700 180 2 340 18. 190 2 800 190 2 420 19. 190 2 800 190 2 420 20. 200 3 100 200 2 700 21. 180 2 700 180 2 340 22. Gotse Delchev 180 2 600 180 2 240 23. Gorni Chiflik 185 2 500 185 2 130 24. Grudovo 175 2 400 175 2 050 25. Devin 210 3 000 210 2 580 26. Dimitrovgrad 175 2 400 175 2 050 27. 190 2 800 190 2 420 28. 185 2 700 185 2 330 29. Dulovo 190 2 800 190 2 420 30. 190 2 700 190 2 320 31. 190 2 800 190 2 420 32. 195 2 900 195 2 510 33. 175 2 400 175 2 050 34. 185 2 800 185 2 430 35. 170 2 300 170 1 960 36. 190 2 800 190 2 420 37. 195 3 400 195 3 010 38. 190 2 800 190 2 420

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Number of Number of heat heat days tHP DD at: DD at: days tHP at: No Place at: e  12C e  12C

i, H = 19C i, H = 17C 39. 180 2 600 180 2 240 40. 175 2 400 175 2 050 41. 190 3 000 190 2 620 42. 250 4 000 250 3 500 43. Kotel 190 2 800 190 2 420 44. 175 2 400 175 2 050 45. 185 2 800 185 2 430 46. Kula 190 3 000 190 2 620 47. 175 2 400 175 2 050 48. 190 2 700 190 2 320 49. 180 2 700 180 2 340 50. Lom 180 2 700 180 2 340 51. 180 2 600 180 2 240 52. Madan 210 3 000 210 2 580 53. 170 2 200 170 1 860 54. 180 2 500 180 2 140 55. Montana 180 2 800 180 2 440 56. Nikopol 175 2 600 175 2 250 57. 175 2 400 175 2 050 58. Novi Pazar 190 2 800 190 2 420 59. 190 2 800 190 2 420 60. 175 2 600 175 2 250 61. 180 2 700 180 2 340 62. 175 2 500 175 2 150 63. 195 3 000 195 2 610 64. 195 3 000 195 2 610 65. 155 2 000 155 1 690 66. 165 3 000 165 2 270 67. 180 3 100 180 2 740 68. 180 2 700 180 2 340 69. 175 2 500 175 2 150 70. 170 2 300 170 1 960 71. Popovo 185 2 800 185 2 430 72. Preslav 190 2 800 190 2 420 73. 180 2 600 180 2 240 74. Parvomai 180 2 600 180 2 240 75. 185 3 000 185 2 630 76. 190 2 800 190 2 420 77. 220 3 300 220 2 860 78. Ruse 175 2 600 175 2 250

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Number of Number of heat heat days tHP DD at: DD at: days tHP at: No Place at: e  12C e  12C

i, H = 19C i, H = 17C 79. 220 3 300 220 2 860 80. 160 2 100 160 1 780 81. 165 2 200 165 1 870 82. 175 2 600 175 2 250 83. 195 3 000 195 2 610 84. 185 2 800 185 2 430 85. 180 2 700 180 2 340 86. 175 2 400 175 2 050 87. 200 3 100 200 2 700 88. 240 3 600 240 3 120 89. 190 2 900 190 2 520 90. 160 2 100 160 2 780 91. 170 2 300 170 1 960 92. 190 2 800 190 2 420 93. 195 3 000 195 2 610 94. 170 2 400 170 2 600 95. 195 3 000 195 2 610 96. Tran 220 3 500 220 3 060 97. 190 2 800 190 2 420 98. 180 2 700 180 2 340 99. 190 2 800 190 2 420 100. 180 2 600 180 2 240 101. 170 2 300 170 1 960 102. 175 2 300 175 1 950 103. Hissarya 175 2 500 175 2 150 104. 160 2 100 160 1 780 105. 250 3 800 250 3 300 106. 180 2 600 180 2 240 107. 190 2 800 190 2 420 108. 180 2 500 180 2 140

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9. Quality standards

Pursuant to an Order of the Minister of Economy and Energy, the energy-saving assessment methodologies have been established.

Energy savings shall be established by estimating and/or measuring energy consumption at the sites concerned after implementing the measures to increase energy efficiency. Energy savings shall be presented in terms of the amounts saved: primary energy consumption, final energy consumption and carbon dioxide emissions, in accordance with the requirements of the specific methodologies.

The specific methodologies were developed on the basis of standardised methodologies recommended in EU documents and others that were developed and proposed by those who carry out energy audits of buildings and/or industrial systems, building certifications, conformity assessments of investment projects and energy-saving assessments.

The following principles were adhered to when drawing up the specific methodologies:

1. The principle of universality, which establishes a single basis in order to benchmark the energy savings expected from different measures to increase energy efficiency;

2. The principle of compatibility, which ensures that the methodology can be applied to all sites of the same type;

3. The principle of functionality, which ensures that the methodology gathers all of the information required to demonstrate the energy-saving effect in a measurable, assessable and verifiable manner.

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10. Audit protocols

The objective of the energy savings assessment is to establish, against an earlier baseline state/baseline year, the amount of energy saved in a building as a result of the measures implemented to increase energy efficiency, and to demonstrate the extent to which the individual energy-saving targets were achieved.

At least one year after implementing the measures to increase energy efficiency among final energy users in the buildings, the savings achieved shall be demonstrated by means of:

1. Energy efficiency audits that are carried out upon completion of comprehensive sets of measures in the buildings in order to achieve the energy efficiency requirements; or

2. The application of specific methodologies.

Energy savings shall be established by estimating and/or measuring energy consumption at the sites concerned after implementing the measures to increase energy efficiency. Energy savings shall be presented in terms of the amounts saved: primary energy consumption, final energy consumption and carbon dioxide emissions.

The energy savings achieved at the final customers’ sites shall be demonstrated by carrying out an energy efficiency audit and/or assessment using a specific methodology, both before and after the implementation of the measures.

The quantitative and qualitative characteristics of the energy savings achieved as a result of the measures shall be confirmed by energy-saving certificates. Each measure shall be evaluated separately and reflected as such in the energy-saving certificate.

The energy-saving certificate shall contain:

1. Type of obligated party; 2. Name of obligated party; 3. Name and address of site; 4. Name of site owner; 5. Measure(s) implemented to increase energy efficiency; 6. Energy savings corresponding to the energy efficiency measure(s); 7. Amount invested in the implementation of the measure(s) and name of the party that provided the funding.

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A certificate will not be issued if the reports from the energy efficiency audits and/or assessments using the specific methodologies do not conform to the applicable regulatory requirements.

The energy efficiency audit of buildings in use will establish the level of energy consumption and the specific options for reducing it, and will recommend measures to increase energy efficiency.

The energy performance certificate for buildings in use shall certify the energy performance, the current level of energy consumption and its position in the scale of energy consumption classes. The objective of the energy savings assessment is to demonstrate the savings resulting from the implementation of a single or a set of measures to increase energy efficiency.

The certificate of energy performance of buildings in use shall contain the following details:

1. Functional use and address of the building, photograph/computer graphic of the building; 2. General geometric characteristics, including gross floor space, heated floor space and cooled floor space; 3. Energy consumption class; 4. Integrated energy performance value of the building and its reference value expressed as specific annual energy demand in kWh/m2 and primary energy demand in kWh/m2; net energy demand in the absence of internal loads as well as gross energy demand taking into account the internal loads, in kWh/m2; total annual energy demand, in MWh; total

annual primary energy demand, in MWh; CO2 emissions in tonnes/year equivalent to the total annual energy demand; 5. Energy from renewable sources in absolute terms and relative to the gross energy demand of the building; specific geometric characteristics of the enveloping structure, design-based energy performance, including reference values; 6. Energy sources in the building, including renewable sources, energy performance values of the systems used to maintain the microclimate, expressed in specific annual demand for heating, ventilation and air conditioning, in kWh/m2; 7. Specific annual energy demand of the domestic hot water system, in kWh/m2, and energy sources used, including renewable sources; 8. Distribution of the building’s annual energy demand among heating, ventilation, cooling, hot water and lighting, expressed as a proportion of the total demand; 9. Reference number, date of issue, validity period and period of exemption from property tax under the Local Taxes and Fees Act;

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10. Name of certifying person and registration number of that person’s certificate of entry in the public register.

The energy performance certificate for buildings in use must have a predefined format and it must not be valid for more than 10 years.

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11. How the need to fulfil the requirement in the second subparagraph of Article 7(1) is taken into account

Compliance with the requirement in the second subparagraph of Article 7(1) will be ensured by introducing various types of mechanisms and obligations to promote the implementation of energy efficiency measures leading to measurable energy savings. This will involve appropriate amendments to Bulgaria’s primary and secondary legislation.

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ANNEX: List of regulatory documents

1. Energy Efficiency Act:

http://www.mi.government.bg/bg/pages/energiyna-efektivnost-52.html

2. Regulation on the methodologies for determining national indicative targets, the procedures for allocating these targets as individual energy-saving targets among the persons referred to in Article 10(1) of the Energy Efficiency Act, the eligible energy efficiency measures, the assessment methodologies and the methods for verifying energy savings.

http://www.seea.government.bg/documents/Naredba_Metodiki.pdf

3. Specific methodologies for assessing energy savings:

http://www.seea.government.bg/index.php?option=com_content&view=article&id=931 3&Itemid=244&lang=bg

4. Regulation No 7/2004 on energy efficiency, preserving heat and saving energy in buildings:

http://lex.bg/bg/laws/ldoc/2135497693

5. Regulation No 16-1594 of 13 November 2013 on energy efficiency audits, and the certification and assessment of energy savings in buildings:

http://www.seea.government.bg/index.php?option=com_content&view=article&id=9250& Itemid=227&lang=bg

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