Regional Development Plan

SPN Regional Development Plan

Author: Itayi Utah

Version: 1.2

Date: June 2013 UK Power Networks (Operations) Limited. Page 1 of 44

Registered in England and Wales. Regional Development Plan

Beddington Contents 1. INTRODUCTION ...... 3 1.1 EXECUTIVE SUMMARY ...... 3 1.2 PROPOSED PROJECTS (>£1 MILLION) ………………………………………………………………………………………………..…………....4 1.3 COSTS PROFILE ...... 4 1.4 OUTPUT MEASURES………………………………………………………………………………………………………………………………..………5 2. NETWORK CONFIGURATION ...... 7

2.1 EXISTING NETWORK ...... 7 2.2 EMBEDDED GENERATION ...... 9

2.3 PROJECTS IN PROGRESS ...... 10 3. NEETWORK DEVELOPMENT CONSIDERATIONS ...... 11

3.1 DEVELOPMENT AREAS ...... 11

3.2 ASSET HEALTH ...... 13

3.3 SECURITY OF SUPPLY AND LOAD INDEX ANALYSIS ...... 18

3.4 OPERATIONAL AND TECHNICAL RESTRICTIONS ...... 20

3.5 NATIONAL GRID ...... 21 3.6 NETWORK CONSTRAINTS ...... 21 3.7 SMART SOLUTIONS ...... 21 4. RECOMMENDED STRATEGY ...... 22

4.1 ASSET REPLACEMENT...... 22 4.2 REINFORCEMENT……………………………………………………………………………………………………………………………………………25

4.3 COSTS AND PHASING ...... 29

4.4 HI / LI IMPROVEMENT ...... 30 5. ALTERNATIVES CONSIDERED ...... 35

5.1 ALTERNATIVE STRATEGY 1 - ...... 36 5.2 ALTERNATIVE STRATEGY 2 …………………………………………………………………………………………………………………………….36 6. REFERENCES ...... 36

6.1 APPENDICES ...... 36

6.2 DOCUMENT HISTORY ...... 37 7. DOCUMENT SIGN OFF ...... 37

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Beddington 1. INTRODUCTION 1.1 Executive Summary This Regional Development Plan (RDP) reviews UK Power Networks (UKPN)’s SPN EHV network supplied from Beddington 400/132kV Grid Supply Point (GSP) with an aggregate total demand of 521MW (Winter-W) and 339MW (Summer-S) across 8 SPN 132kV grid substations and 26 SPN 33kV primary substations. The firm capacity for Beddington GSP is 829.4MW (W) and 732.7MW (S) with forecast demand by 2023 of 565MW (W) and 384.6MW (S). Geographically the network footprint covers Croydon Borough of London and its surrounding local areas as illustrated in figures 1 an 2 below. Croydon Borough has the largest population of any London borough with a total population of circa 339,000 people and 150,000 homes. Croydon Borough of London’s Local Development Framework (LDF) and Core Strategy (CS) includes the Croydon Metropolitan Centre (CMC) regeneration, which is expected to result in 22MW of new demand that can be supported from Croydon Central 33/11kV primary substation, which has a firm capacity of 39.6 MW (W) and 29.7MW (S) and current maximum demand (MD) of 5.1MW (W) and 5.9MW (S). The new load will result in a combined forecast total load demand of 27.1MW (W) and 27.9MW (S) if the proposed CMC regeneration goes ahead. It is proposed to work proactively with the local planning authority and all principal land developers to develop a resilient and reliable network to accommodate 21,510 new houses earmarked for development up to 2031. However the proposed Croydon Borough development is outside the control of UK Power Networks and the programme is expected to be volatile.

Figure 1 Croydon Borough Map Figure 2 Croydon Borough Ward Map

(Source - www.croydon.gov.uk) (Source - www.croydon.gov.uk)

Reinforcement of six primary substations and transfer of load from highly loaded sites to sites with more capacity headroom is part of the recommended strategy under this RDP. Selective and targeted asset replacement schemes are proposed to maintain the reliability of switchgear, transformers and cables. DPCR5 major works currently under construction or approved and scheduled to start soon include Beddington Grid transformers replacement, Coulsdon Primary ITC, Norbury Primary load transfer and Beddington-Purley 132kV GPC

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Beddington replacement. Replacement of Purley Local T1 and T2 was recently completed. Recovery of the poor asset health GT2 and the L120T 33kV switchgear at Croydon B has been suspended pending completion of the Croydon Grid –Croydon B 33kV interconnector.

1.2 Proposed projects (>£1M) The projects listed below are identified in this RDP and 14th January 2013 NAMP for implementation during the current DPCR5 and ED1 periods.  Beddington/Purley - Gas Pressure Cable Replacement – £ 3,018k  Beddington Local 33kV-Sutton Grid 33kV (Circuit 1-E-J & Circuit 2-E-J) - 33kV FFC replacement – £ 1,719k  East Croydon 33/6.6kV - Replace Primary Transformer (T1, T2) – £ 1,402k  Norbury Primary - Transfer Load to Croydon B - £ 2,134k  Coulsdon 33/11kV Primary ITC (2 x 20/40) - £ 4,063k  Addington Local - Replace Primary Transformers (T1, T2) £ 1,198k  Addington Local. Replace 11kV switchgear - £ 2,082k  West Wickham 33/11kV - Replace Primary Transformer (T1, T2) £ 1,212k  Caterham 33/11kV - Replace 11kV Switchgear - £ 1,058k  St Helier 33kV/11kV – ITC £ 3,533k  Addington Grid 132/33 kV Reinforcement: Transfer of Addington Local to Ashburton Grid - £ 2,943k  Beddington-Addington Grid (Circuit 1-A-B-P3,Circuit 1-D-E-P2,Circuit 1-E-F-P1, Circuit 2-DE1-P3,Circuit 1-B-D-P3,Circuit 1- B-D-P2) - 132kV Fluid filled cable replacement - £ 11,099k  Purley Grid: 33kV Interconnection to Addington £4,050k

1.3 Costs profile

Table 1 - NAMP Costs Summary (2013-2023)

Table J Less Ind Baseline 5th June 2013 15:55_Official Frozen NAMP

Cat Description 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 Total Total /2014 /2015 /2016 /2017 /2018 /2019 /2020 /2021 /2022 /2023 (DPCR5) (ED1) A&H Total Asset replacement 607.53 949.84 3,347.43 5,724.74 4,717.93 1,586.18 3,330.55 318.37 1,881.30 686.37 4,904.80 18,245.43 R&T Total Reinforcement 3,112.99 4,209.40 1,127.78 1,545.31 3,162.53 1,166.25 336.77 24.51 212.57 555.89 8,450.18 7,003.83 Grand Total 3,720.53 5,159.24 4,475.22 7,270.05 7,880.46 2,752.43 3,667.32 342.88 2,093.87 1,242.25 13,354.98 25,249.26

Table 1 above provides the forecast aggregate NAMP cost for network expenditure under this RDP during the last two years of DPCR5 and the ED1 period subject to project feasibility studies and final approval.

1.4 Output Measures

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Beddington The forecast load indices for 2023, with and without intervention, are detailed below:

The above chart provides an illustration of load indices before and after proposed investment and intervention strategies for all substations covered in this RDP. The substations projected to be LI 4/5 at the end of ED1 include Sutton B, Caterham, Croydon Central and Croydon B. the period is Shorts Gardens (project to be commissioned at the beginning of ED2).

Output Measures - Health Index The forecast health indices for 2015 and 2023, with and without intervention, for each plant category are detailed below:

HV Circuit breakers 300.00

250.00

200.00 2015 150.00 2023 100.00 2023 with Intervention 50.00

0.00 1 2 3 4 5

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Beddington Primary Transformers 35

25 2015

20 2023

15 2023 with Intervention 10

0 1 2 3 4 5

Grid Transformers

8 2015

2023 6 2023 with 4 Intervention

1 2 3 4 5

The charts above provide projected health indices for network assets considered under this RDP during the ED1 period with and without investment

1.6 Principle Risks and Dependencies The schemes covered in this RDP have been planned based on the planning load estimates 2013. The load forecasts have assumed a poor economic and low growth future. If the economic situation should improve beyond current expectations there is a risk that there will be shortfall of reinforcement schemes planned. The load forecasts also include an assumed level of embedded generation being connected to the network. Should this generation not materialise as expected, then a larger than forecast load growth could be realised. Where Demand Site Response has been included at a substation, this is based on an assumption that customers will be willing to accept the scheme. In most cases these customers have not as yet been identified. The decommissioning of Croydon B GT2 and 33kV L120 switchgear is dependent on the completion of the new Croydon Grid-Croydon B 33kV interconnector. The replacement of Beddington-Purley 132kV gas pressurised cable circuits is dependent on the provision of 33kV contingency to support for Purley Grid load to cover N-3 conditions.

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Beddington 2. NETWORK CONFIGURATION

2.1 Existing Network This Regional Development Plan reviews the SPN EHV network supplied from Beddington 400/132kV Grid Supply Point (GSP). Beddington GSP Beddington GSP is located within a National Grid site comprising 400/275/132/33kV assets supplying LPN and SPN networks. The site is located in a busy industrial and commercial area of Croydon Borough of London. Wayleave easements and consents for cable routes in and out of the site are difficulty to acquire if not almost impossible because the road leading into the site is privately owned.

Figure 3: Beddington GSP Site Map

The 132kV double busbar GIS at Beddington GSP is fed via 4x240MVA 400/132kV super grid transformers (SGT’s) and has 18x132kV outgoing circuits, which include the following 132kV feeders: -

Addington Grid 2x60MVA, 1x30MVA 132/33kV – Connection is via 2x132kV composite circuits comprising 6.5km 132kV oil filled cables and 2.46km OHL each. The oil filled cables are rated 87MVA (W) and 78 (S) while the OHL conductors are rated 130MVA (W) and 105MVA (S). The site is at the centre of a residential area. Primary substations fed from Addington Grid include Addington Grid 33/11kV, Addington Local, Biggin Hill, Selsdon and West Wickham

Ashburton Grid 2x90MVA 132/33kV – Connection is via 2x5.7km 132kV oil filled cables rated 97MVA (W) and 81MVA (S). The site is at the centre of a residential area and located in a land depression, which highly prone to flooding. Primary substations fed from Ashburton Grid include Selhurst, Shirley, Suffolk Road and Network Rail.

Beddington Grid 2x60MVA 132/33kV – This site is located within the GSP substation perimeter fence and connected via 2x0.9km 132kV cables rated 205MVA (W) and 185MVA (S). The 60MVA transformers are being installed currently owing to poor asset health of the previously installed 30MVA transformers. However the transformer tails, which run over a distance of 200m to the 33kV switchboard are limited to 38MVA (W) and 32MVA (S), which is way below the

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Beddington rating of the newly installed 60MVA transformers hence need replacement in the near future in order to benefit from the extra capacity provided by the new transformers. Currently Beddington Grid only supplies East Croydon primary but also supply West Croydon and St Helier.

Beddington Local/Bridges Lane Grid 2x30/30MVA double wound secondary 132/11kV transformers – This site is located close to the GSP substation and connected via 2x0.9km 132kV cables rated 205MVA (W) and 185 (S). The 60MVA transformers are secondary dual wound transformers each split between Beddington Local and Bridges Lane 11kV switchboards. The Beddington Local 11kV switchboard is directly interconnected with Prologis 11kV switchboard, which is a high demand data centre.

Croydon Grid 2x90MVA 132/333kV – Connection is via 2x132kV composite circuits comprising 0.9km 132kV cables and 1.4km OHL each. The oil filled cables are rated 205MVA (W) and 185MVA (S) while the OHL conductors are rated 158MVA (W) and 139MVA (S). Primary substations fed from Croydon Grid include Croydon Grid 33/11kV, Croydon Central, Croydon A, Norbury and Spurgeons Bridge

Croydon B 1x60/90MVA, 1x45MVA 132/33kV – Connection is via 2x132kV composite circuits comprising 0.9km 132kV cables and 0.7km OHL each. The cables are rated 205MVA (W) and 185MVA (S) while the OHL conductors are rated 130MVA (W) and 105 (S). The 45MVA transformer and L120 33kV switchgear are earmarked for decommissioning owing to poor asset health. The site will eventually run in parallel with Croydon Grid when the proposed new 33kV interconnector is commissioned. Currently Croydon B Grid only supplies Bensham Grove primary and Network Rail but can also supply Suffolk Road and Selhurst.

Prologis Grid 2x30MVA 132/11kV – Connection is via 2x1.7km 132kV cables rated 92MVA (W) and 85MVA (S). This is a dedicated customer substation.

Purley Grid 2x90MVA 132/33kV – Connection is via 2x4.9km 132kV gas compressed cables rated 99MVA (W) and 87MVA (S). The site is at the centre of a residential area. Primary substations fed from Purley Grid include Purley Local, Caterham, Coulsdon and West Croydon.

Sutton Grid 2x90MVA 132/33kV – Connection is via 2x6.1km 132kV cables rated 112MVA (W) and 90 (S). The site is at the centre of a residential area. Primary substations fed from Sutton Grid include Sutton A, Sutton B, Nork, North Cheam and St Helier.

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Beddington Figure 4: Beddington GSP Netmap Diagram

2.2 Embedded Generation (G59/2)

Table 2. List of G59/2 Embedded Generators Connected to the Network covered by this RDP

Customer Name Town/Parish Type Mode of Installed Installed No. of Contracted Operating Substation Grid Group GSP/BSP Year of Export Commissi (MAVIS) Operation DG (MW) DG (MVA) Gen (MW) Volts (kV) Name on CROYDON ENERGY CROYDON Gas LONG TERM 55.500 55.000 1 50.00 132.0 Croydon Grid Croydon Grid Beddington 01/12/2002 LTD PARALLEL SGT DIRECT LINE CROYDON Diesel Standby 0.440 0.440 1 0.00 6.6 East Croydon Beddington Beddington 01/08/1997 VIRIDORINSURANCE WASTE CROYDON Landfill LONG TERM 7.000 7.000 1 3.00 11.0 Beddington BeddingtonTotal BeddingtonSGT 01/11/2006 MANAGEMENT LTD gas PARALLEL Local Total SGT MAYDAY THORNTON CHP LONG TERM 0.900 0.900 1 0.00 6.6 Croydon Grid Croydon Grid Beddington 27/01/1999 HEALTHCARE NHS HEATH PARALLEL SGT SUTTON & EAST SUTTON Diesel LONG TERM 3.500 3.500 1 0.00 11.0 Sutton A Sutton Grid Beddington 01/04/1998 SURREY WATER PLC PARALLEL SGT THAMES WATER CARSHALTON Diesel Short Term 0.800 0.800 1 0.00 11.0 St Helier Sutton Grid Beddington 15/02/2010 UTILITIES LTD Parallel SGT TESCO STORES LTD PURLEY CHP LONG TERM 0.060 0.060 1 0.00 11.0 Purley Local Purley Grid Beddington 27/02/2009 PARALLEL SGT RIALTO HOMES LTD CROYDON Wind LONG TERM 0.048 0.048 8 0.00 6.6 Croydon A Croydon Grid Beddington 10/12/2007 PARALLEL 6.6kV SGT RIALTO HOMES LTD CROYDON CHP LONG TERM 0.070 0.088 1 0.00 6.6 Croydon A Croydon Grid Beddington 2008 PARALLEL 6.6kV SGT

The total installed capacity of G59/2 embedded generation under this RDP is 68MW with Croydon Energy generation contributing 55MW from its gas turbine. Croydon Energy is a STOR generator directly connected on the 132kV network at Croydon grid substation and contracted by NG to provide short term system support during times of high load demand or poor frequency levels.

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Beddington 2.3 Projects in progress DPCR5 NAMP projects approved to date are listed in table 5 below.

Table 3. NAMP Table J Less Indirect (DPCR5 -2012 to2015)

Cat Ref Description 2010 2011 2012 2013 2014 2015 /2011 /2012 /2013 /2014 /2015 /2016 R 1.33.01.3190 Coulsdon 33/11kV Primary - Reinforcement 14 1,604 1,625 819 0 0 R 1.37.07.3236 Norbury Primary - Transfer Load to Croydon B 0 0 246 1,322 567 0 A 1.51.01.3306 Beddington 132/33kV - Replace GT3 and GT4 34 1,278 501 0 0 0 A 1.51.03.3831 Purley Local - Replace T1 and T2 110 741 35 0 0 0

Approved Works: 3306: Replacement of GT3 and GT4 at Beddington 132/33kV is in progress and scheduled for completion during 2012. 3831: Purley Local T1 and T2 replacement is now complete. 3190: Coulsdon ITC involves relocation of the substation site, replacement of an existing 16/20MVA transformer with a 20/40MVA unit, banking the two existing 33kV circuits from Purley Grid and installation of a new 40MVA circuit from Purley Grid. Cable installation is complete and civil works for switchroom construction are now in progress. 3236: Norbury primary load transfer include the introduction of a new 33kV interconnector between Croydon Grid and Croydon B, which will facilitate parallel running arrangement of the two grid sites. Feasibility studies and cable route trial holes have been initiated. This project is scheduled for completion by 2014. Croydon Grid and Croydon B will be operated in parallel once the Croydon Grid/Croydon B 33kV interconnector is completed. Norbury primary load will be transferred from Croydon Grid to Croydon B as the new normal running arrangement.

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Beddington 3. Network Development Considerations

3.1 Development areas

Croydon Metropolitan Centre Five master plans to develop and improve the Croydon Metropolitan Centre (CMC) have been produced taking advantage of the newly introduced London East overland train network linking Croydon to London Underground network for the first time in 2010. The five master plans include East Croydon Master Plan, Fair Field Master Plan, Mid-Croydon Master Plan, Old Town Master Plan and West Croydon Master Plan as illustrated in appendix D. The master plans propose introduction of distinctive shopping malls, hotels, new restaurants, new offices, new homes, entertainment space and multi-functional buildings including the revamping of existing buildings around West Croydon train station, Derby road, Station road, London road buildings, Whitgift Link, North End, Wandle Park and All Angels church compound among other initiatives. Currently four UKPN primary substations feed into the CMC zone. Primary substations in the proximity include Croydon Grid 33/11kV, Croydon A 33/6.6kV, Croydon Central 33/11kV and East Croydon 33/11kV. Croydon Central primary substation is expected to accommodate most of the load arising from these new developments. An enquiry for 20MVA load for Ruskin Square was processed recently on behalf of Major Connections with proposals to introduce a new primary substation (Croydon North) fed form Ashburton Grid. Several enquiries for new connections within the CMC zone have been processed by Distribution Planning and these have been accommodated or assigned connections from the existing network.

Figure 5 – West Croydon Master Plan

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Beddington Figure 6 – Arial View of West Croydon Master Plan

Housing Addington – Land in this location is physically constrained by the National Green Belt embargo and most developments will be based on targeted infilling of existing housing sites, which will not cause any major changes to the existing electricity supply network. Addiscombe – Moderate residential growth is expected, which not affect the existing electricity network to a great extent. Broad Green and Selhurst - Moderate residential growth is expected, which not affect the existing electricity network to a great extent. Cousldon- Major residential growth will be delivered through the Coulsdon Master Plan, which includes Cane Hill. Coulsdon 33/11kV primary substation is currently out of firm and undergoing increase in firm capacity by the

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Beddington addition of 20/40MVA in place of the existing 16/20MVA transformers, which will significantly improve electricity supply availability in the area and equally accommodate the proposed new housing development. Croydon Opportunity Area – Nearly 7,300 new homes are proposed in this location, which is a third of all the new homes proposed in Croydon Borough. The proposed new homes have a potential for 14MVA new power demand in the area currently supplied by East Croydon and Croydon Central primary substations. Both sites have combined firm capacity headroom of 40MVA during winter and 27MVA during summer, hence adequate to meet significant load from new connections. Crystal Palace and Upper Norwood - Moderate residential growth is expected, which will not affect the existing electricity network to a large extend. Kenley and Old Coulsdon – Low potential for new residential growth is forecasted in this area, hence very little impact on the existing electricity supply network is expected Norbury - Low potential for new residential growth is forecasted in this area, hence very little impact on the existing electricity supply network is expected Purley - Moderate residential growth is expected, which not affect the existing electricity network to a large extend. Sanderstead - Low potential for new residential growth is forecasted in this area, hence very little impact on the existing electricity supply network is expected Selsdon - Most of the new residential developments will be based on targeted infilling of existing housing sites and wind fall sites, which will not cause any major changes to the existing electricity supply network. Shirley – This is an area of low residential growth, hence very little impact on the existing electricity supply network is expected South Croydon – Moderate residential growth is expected with a mixture of windfall and infill developments, which will have little impact on the existing electricity network. South Norwood and Woodside - Moderate residential growth is expected, which will not affect the existing electricity network to a large extend Thorton Heath - Moderate residential growth is expected, which will not affect the existing electricity network to a large extend Waddon – This an area on major new residential growth along Purley Way. This area is close to three primary substations (Purley Local, West Croydon and Beddington Local) with substantial firm capacity headroom between them to accommodate any new load demand from the proposed new homes.

3.2 Asset Health Health indices for all network equipment covered in this RDP are listed in tables 4 to 10 below. The equipment groups covered include HV circuit breakers (6.6kV and 11kV), EHV circuit breakers (33kV), 66kV&132kV circuit breakers, primary transformers (33/11/6.6kV), grid transformers (132/33/11kV), overhead lines (132kV) and underground cables (33kV and 132kV) It should be noted that HIs presented in the RDP will not align with the RIGS. The HIs presented in the RDP are the outcome of our ARP models on an asset by asset basis. Different rules are applied for RIGs reporting, as agreed with Ofgem, where assets may be grouped and all assets in the group take the same HI.

Table 4. HV Circuit breakers (Without Intervention) 2015 2023 Substation No. HI1 No. HI2 No. HI3 No. HI4 No. HI5 No. HI1 No. HI2 No. HI3 No. HI4 No. HI5 ADDINGTON GRID 11KV 9 1 10 ADDINGTON LOCAL 4 12 1 7 9 1 BEDDINGTON 132/11KV 17 17 BENSHAM GROVE 6.6KV 15 15 BIGGIN HILL 33KV 5 5 7 3 BRIDGES LANE 11KV 2 11 2 11

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Beddington

2015 2023 Substation No. HI1 No. HI2 No. HI3 No. HI4 No. HI5 No. HI1 No. HI2 No. HI3 No. HI4 No. HI5 CATERHAM 33/11KV 12 6 5 1 COULSDON 33/11KV 12 3 15 CROYDON A 6.6KV 36 36 CROYDON CENTRAL 33/11KV 13 13 CROYDON GRID 33/11KV 12 3 2 12 1 EAST CROYDON 33/6.6 KV 18 18 NORBURY 33/6.6KV 16 2 18 NORK 33/11KV 12 12 NORTH CHEAM 33/11KV 13 3 8 2 PROLOGIS 132/11KV 10 10 PROLOGIS 132KV 2 2 PURLEY 11KV 20 20 SELHURST 33/6.6 KV 10 5 5 SELSDON 33/11 KV 6 4 1 9 SHIRLEY 33/11kV 1 9 2 1 11 SPURGEONS BRIDGE 6 12 18 ST HELIER 33/11KV 11 6 5 SUFFOLK ROAD 6.6KV 2 14 2 14 SUTTON A 33/11KV 14 13 1 SUTTON B 33/11KV 12 12 WEST CROYDON 33/11KV 14 14 WEST WICKHAM 33/11KV 4 7 7 4

Table 5. EHV circuits breakers

2015 2023 Substation No. HI1 No. HI2 No. HI3 No. HI4 No. HI5 No. HI1 No. HI2 No. HI3 No. HI4 No. HI5 ADDINGTON GRID 132 KV 3 3 ADDINGTON GRID 33 KV 12 13 ASHBURTON GRID 132 KV 2 2 ASHBURTON GRID 33 KV 11 5 6 BEDDINGTON 132/33KV 9 9 CROYDON B 132 KV 2 2 2 2 CROYDON B 33KV 9 1 9 1 CROYDON GRID 132 KV 2 2 CROYDON GRID 33KV 13 4 9 PURLEY GRID 6 5 2 8 1 PURLEY GRID 132 KV 2 2 SUTTON GRID 132 KV 2 2 SUTTON GRID 33KV 11 11

Table 6. 66 and 132kV circuit breakers

2015 2023 Substation No. HI1 No. HI2 No. HI3 No. HI4 No. HI5 No. HI1 No. HI2 No. HI3 No. HI4 No. HI5 BEDDINGTON 22 2 20 CROYDON ENERGY 132KV SWITCHING STATION 1 1 CROYDON GRID 132 KV 1 1

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Beddington

Table 7. Primary transformers

2015 2023 Substation No. HI1 No. HI2 No. HI3 No. HI4 No. HI5 No. HI1 No. HI2 No. HI3 No. HI4 No. HI5 ADDINGTON GRID 11KV 2 2 ADDINGTON LOCAL 1 1 1 1 BENSHAM GROVE 6.6KV 2 2 BIGGIN HILL 33KV 2 2 CATERHAM 33/11KV 2 2 COULSDON 33/11KV 1 1 1 1 CROYDON A 6.6KV 2 1 1 CROYDON B 132 KV 1 1 CROYDON CENTRAL 33/11KV 2 2 CROYDON GRID 33/11KV 2 2 EAST CROYDON 33/6.6 KV 2 1 1 NORBURY 33/6.6KV 2 2 NORK 33/11KV 2 1 1 NORTH CHEAM 33/11KV 2 2 PURLEY 11KV 2 1 3 SELHURST 33/6.6 KV 2 1 1 SELSDON 33/11 KV 2 2 SHIRLEY 33/11kV 1 1 1 1 SPURGEONS BRIDGE 2 2 ST HELIER 33/11KV 2 2 SUFFOLK ROAD 6.6KV 2 2 SUTTON A 33/11KV 2 2 SUTTON B 33/11KV 2 2 WEST CROYDON 33/11KV 2 2 WEST WICKHAM 33/11KV 1 1 1 1

Table 8. Grid transformers

2015 2023 Substation No. HI1 No. HI2 No. HI3 No. HI4 No. HI5 No. HI1 No. HI2 No. HI3 No. HI4 No. HI5 ADDINGTON GRID 132 KV 3 3 ASHBURTON GRID 132 KV 2 2 BEDDINGTON 2 2 BEDDINGTON 132KV CROYDON B 132 KV 1 1 CROYDON GRID 132 KV 2 1 1 PROLOGIS 132KV 1 1 1 1 PURLEY GRID 132 KV 2 2 SUTTON GRID 132 KV 1 1 1 1

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Beddington

Table 9. Over Head Lines Corporate Equipment Section Equipment Type Left Right (LC) (LF) (RC) (RF) (EC) (EF) (TSW) (F) Asset ID Group ID (Route) Circuit Circuit OFGEM OFGEM OFGEM OFGEM OFGEM OFGEM OFGEM OFGEM Operatio Operatio HI 2015 HI 2015 HI 2015 HI 2015 HI 2015 HI 2015 HI 2015 HI 2015 nal nal Voltage Voltage 000000304603 132TOWER PL Tower with 2 circuits 132 132 2 2 2 2 2 2 4 2 000000304604 132TOWER PL Tower with 2 circuits 132 132 2 2 2 2 2 2 4 2 000000304605 132TOWER PL Tower with 2 circuits 132 132 2 2 2 2 2 2 4 3 000000304606 132TOWER PL Tower with 2 circuits 132 132 2 2 2 2 2 2 4 3 000000304607 132TOWER PL Tower with 2 circuits 132 132 2 2 2 2 2 2 3 NO RESULT 000000304608 132TOWER PL Tower with 2 circuits 132 132 2 5 2 2 2 2 3 NO RESULT 000000304609 132TOWER PL Tower with 2 circuits 132 132 2 2 2 2 2 2 4 2 000000304610 132TOWER PL Tower with 2 circuits 132 132 2 2 2 2 2 2 4 2 000000304611 132TOWER PL Tower with 2 circuits 132 132 2 2 2 2 2 2 3 NO RESULT 000000305262 132TOWER PQ Tower with 2 circuits 132 132 2 2 2 2 2 2 4 3 000000305264 132TOWER PQ Tower with 2 circuits 132 132 2 2 2 2 2 2 4 3 000000305265 132TOWER PQ Tower with 2 circuits 132 132 2 2 2 2 2 2 4 3 000000305266 132TOWER PQ Tower with 2 circuits 132 132 2 2 2 2 2 2 4 3 000000305267 132TOWER PQ Tower with 2 circuits 132 132 2 2 2 2 2 2 4 3 000000305269 132TOWER PQ Tower with 2 circuits 132 132 2 2 2 2 2 2 4 3 000000305271 132TOWER PQ Tower with 2 circuits 132 132 2 2 2 2 2 2 4 3 000000305273 132TOWER PQ Tower with 2 circuits 132 132 2 2 2 2 2 2 4 3 000000305275 132TOWER PQ Tower with 2 circuits 132 132 2 2 2 2 2 2 4 3 000000305277 132TOWER PQ Tower with 2 circuits 132 132 2 2 2 2 2 2 4 2 000000305289 132TOWER PQB Tower with 2 circuits 132 132 2 2 2 2 2 2 4 2 000000305290 132TOWER PQB Tower with 2 circuits 132 132 2 2 2 2 2 2 4 2 000000305291 132TOWER PQB Tower with 2 circuits 132 132 2 2 2 2 2 2 4 2 000000305292 132TOWER PQB Tower with 2 circuits 132 132 2 2 2 2 2 2 4 2 Table 8 above illustrates that most of the overhead lines covered in this RDP have good asset heath condition except for left side fittings on one of the PL route towers and tower structure painting requirements, which is HI4.

Table 9 below provides health indices for cable circuits covered under this RDP. Three cable circuits are identified to be in HI4/5 during DPCR5 and ED1 periods. Replacement of these circuits is included in the current NAMP.

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Beddington Table 10. Underground Cables Corporate Asset ID Section (Route) Cable Section Voltage OFGEM OFGEM HI in 2015 HI in 2024

000002064610 BEDDINGTON LOCAL 33-SUTTON GRID 33 CABLE SECTION: 91039147-1-E-J 33 4 5 000002064612 BEDDINGTON LOCAL 33-SUTTON GRID 33 CABLE SECTION: 91039147-2-E-J 33 3 4 000002064576 BEDDINGTON MAIN-ADDINGTON GRID 132 CABLE SECTION: 90AA9901-2-1B 132 5 5 000002065058 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-A-B-P3 132 5 5 000002065072 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-D-E-P2 132 5 5 000002065067 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-E-F-P1 132 4 5 000002065078 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-DE1-P3 132 4 5 000002065071 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-B-D-P2 132 4 5 000002065059 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-B-D-P3 132 4 5 000002065109 BEDDINGTON-ASHBURTON GRID 132 CABLE SECTION: 99039979-2-A-B 132 3 4 000002064850 PURLEY GRID-WEST CROYDON 33/11 CABLE SECTION: 91418509-2-A-C 33 4 5 000002064851 PURLEY GRID-WEST CROYDON 33/11 CABLE SECTION: 91418509-2-C-F 33 4 5 000002064599 ADDINGTON GRID 33-WEST WICKHAM 33/11 CABLE SECTION: 91018513-1-A-B 33 3 3 000002064604 BEDDINGTON LOCAL 33-EAST CROYDON 33/6.6CABLE SECTION: 91038395-1-3 33 3 3 000002064606 BEDDINGTON LOCAL 33-EAST CROYDON 33/6.6CABLE SECTION: 91038395-2-2 33 3 3 000002064577 BEDDINGTON MAIN-ADDINGTON GRID 132 CABLE SECTION: 90AA9901-2-1R 132 3 3 000002065063 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-A1A-P1 132 3 3 000002065069 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-A1A-P2 132 3 3 000002065057 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-A1A-P3 132 3 3 000002065064 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-A-B-P1 132 3 3 000002065070 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-A-B-P2 132 3 3 000002065065 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-B-D-P1 132 3 3 000002065066 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-D-E-P1 132 3 3 000002065060 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-D-E-P3 132 3 3 000002065073 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-E-F-P2 132 3 3 000002065061 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-E-F-P3 132 3 3 000002065068 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-F-G-P1 132 3 3 000002065074 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-F-G-P2 132 3 3 000002065062 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-F-G-P3 132 3 3 000002065082 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-A1A-P1 132 3 3 000002065089 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-A1A-P2 132 3 3 000002065075 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-A1A-P3 132 3 3 000002065083 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-A-B-P1 132 3 3 000002065090 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-A-B-P2 132 3 3 000002065076 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-A-B-P3 132 3 3 000002065084 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-B-D-P1 132 3 3 000002065077 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-B-D-P3 132 3 3 000002065085 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-DE1-P1 132 3 3 000002065092 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-DE1-P2 132 3 3 000002065079 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-E1E-P3 132 3 3 000002065087 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-E-F-P1 132 3 3 000002065080 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-E-F-P3 132 3 3 000002065088 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-F-G-P1 132 3 3 000002065081 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-F-G-P3 132 3 3 000002065107 BEDDINGTON-ASHBURTON GRID 132 CABLE SECTION: 99039979-1-A-B 132 3 3 000002065103 BEDDINGTON-SUTTON GRID 132 CABLE SECTION: 99039947-1-A-B 132 3 3 000002064848 PURLEY GRID-WEST CROYDON 33/11 CABLE SECTION: 91418509-1-A-C 33 3 3 000002064849 PURLEY GRID-WEST CROYDON 33/11 CABLE SECTION: 91418509-1-C-F 33 3 3 000002064867 SUTTON GRID 33-ST HELIER 33/11 CABLE SECTION: 91478477-2-2 33 3 3 000002064601 ADDINGTON GRID 33-WEST WICKHAM 33/11 CABLE SECTION: 91018513-2-A-B 33 3 3 000002064603 BEDDINGTON LOCAL 33-EAST CROYDON 33/6.6CABLE SECTION: 91038395-1-2 33 2 3 000002064607 BEDDINGTON LOCAL 33-EAST CROYDON 33/6.6CABLE SECTION: 91038395-2-3 33 2 3 000002064578 BEDDINGTON MAIN-ADDINGTON GRID 132 CABLE SECTION: 90AA9901-2-1Y 132 2 3 000002065097 BEDDINGTON-ADDINGTON GRID 132 CABLE SECTION: 99039901-1-1-P1 132 2 3 000002065098 BEDDINGTON-ADDINGTON GRID 132 CABLE SECTION: 99039901-1-1-P2 132 2 3 000002065096 BEDDINGTON-ADDINGTON GRID 132 CABLE SECTION: 99039901-1-1-P3 132 3 3 000002065091 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-B-D-P2 132 2 3 000002065086 BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-E1E-P1 132 2 3

Regional Development Plan Template v1.1 Page 17 of 44 Regional Development Plan

Beddington 3.3 Security of supply and load index analysis Table 11. P2/6 Assessment table

Winter Winter Winter Winter Winter Winter Winter Winter Winter Winter Winter Firm Secondary Transfer 12/ 13 13/ 14 14/ 15 15/ 16 16/ 17 17/ 18 18/ 19 19/ 20 20/ 21 21/22 22/ 23 Sub-station P2/6 Capacity P. F. Summer Summer Summer Summer Summer Summer Summer Summer Summer Summer Summer Voltage (MW) (MW) 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 (MW) (MW) (MW) (MW) (MW) (MW) (MW) (MW) (MW) (MW) (MW)

Addington 132kV NO 132kV 0.00 0.00 0.96 73.68 73.66 74.14 74.77 75.40 75.53 57.03 57.19 57.38 58.01 58.62 Addington 132kV NO 132kV 0.00 0.00 0.96 50.98 50.95 51.29 51.72 52.16 52.25 39.97 40.08 40.21 40.64 41.06 Addington Grid YES 33kV 83.40 3.71 0.96 73.68 73.66 74.14 74.77 75.40 75.53 57.03 57.19 57.38 58.01 58.62 Addington Grid YES 33kV 71.90 0.00 0.92 50.94 50.91 51.25 51.68 52.11 52.21 39.93 40.04 40.17 40.60 41.02 Addington Grid 33/11 YES 11kV 22.54 3.79 0.98 7.68 7.70 7.83 7.97 8.10 8.11 8.12 8.13 8.15 8.24 8.33 Addington Grid 33/11 YES 11kV 16.39 0.00 0.95 5.40 5.41 5.50 5.60 5.69 5.69 5.70 5.71 5.72 5.78 5.84 Addington Local YES 11kV 22.50 3.79 0.98 18.43 18.39 18.43 18.51 18.61 18.65 0.00 0.00 0.00 0.00 0.00 Addington Local YES 11kV 19.40 0.00 0.97 12.25 12.21 12.24 12.29 12.35 12.38 0.00 0.00 0.00 0.00 0.00 Addington Local. YES 11kV 22.50 3.79 0.98 0.00 0.00 0.00 0.00 0.00 0.00 18.70 18.76 18.83 19.06 19.28 Addington Local. YES 11kV 19.40 0.00 0.97 0.00 0.00 0.00 0.00 0.00 0.00 12.43 12.49 12.56 12.79 13.01 Ashburton Grid YES 33kV 112.32 0.00 0.96 53.17 53.15 53.41 53.75 54.09 54.18 73.01 73.20 73.43 74.18 74.88 Ashburton Grid YES 33kV 86.40 0.00 0.96 35.62 35.60 35.75 35.94 36.14 36.19 48.69 48.82 48.98 49.50 49.99 Ashburton Grid RT YES 33kV 24.00 0.00 0.96 10.79 10.79 10.79 10.79 10.79 10.79 10.79 10.79 10.79 10.79 10.79 Ashburton Grid RT YES 33kV 24.00 0.00 0.96 10.76 10.76 10.76 10.76 10.76 10.76 10.76 10.76 10.76 10.76 10.76 Beddington 132/33 YES 33kV 32.80 0.00 0.91 16.48 16.48 16.50 16.54 16.58 16.59 16.61 16.63 16.66 16.74 16.81 Beddington 132/33 YES 33kV 27.30 0.00 0.91 14.02 14.01 14.03 14.06 14.10 14.10 14.12 14.14 14.16 14.22 14.28 Beddington Local YES 11kV 32.50 0.00 0.96 15.15 15.19 15.35 15.52 15.67 15.67 15.69 15.71 15.73 15.83 15.93 Beddington Local YES 11kV 28.80 0.00 0.96 17.58 17.62 17.80 18.00 18.18 18.18 18.20 18.22 18.25 18.37 18.48 Beddington SGT YES 132kV 829.40 0.00 0.96 542.49 542.22 544.34 547.26 550.33 551.17 552.39 553.75 555.33 560.29 564.97 Beddington SGT YES 132kV 732.70 0.00 0.96 369.64 369.36 370.96 373.07 375.21 375.72 376.50 377.35 378.36 381.57 384.60 Beddington Total YES 132kV 74.88 0.00 0.96 53.00 53.01 53.26 53.58 53.89 53.96 54.06 54.18 54.32 54.75 55.16 Beddington Total YES 132kV 57.60 0.00 0.96 47.23 47.24 47.49 47.79 48.09 48.14 48.22 48.31 48.42 48.78 49.12 Bensham Grove YES 6.6kV 22.40 0.00 0.98 10.62 10.60 10.62 10.66 10.72 10.75 10.79 10.83 10.88 11.02 11.16 Bensham Grove YES 6.6kV 17.10 0.00 0.95 6.72 6.70 6.71 6.74 6.77 6.79 6.81 6.84 6.87 6.96 7.04 Biggin Hill YES 11kV 21.20 0.00 0.95 12.26 12.27 12.37 12.50 12.62 12.63 12.66 12.69 12.73 12.85 12.98 Biggin Hill YES 11kV 19.60 0.00 0.98 7.52 7.52 7.59 7.66 7.73 7.74 7.76 7.78 7.80 7.87 7.95 Caterham YES 11kV 22.77 2.58 0.99 21.76 21.75 21.85 21.98 22.12 22.16 22.20 22.26 22.32 22.53 22.73 Caterham YES 11kV 19.80 0.00 0.99 14.92 14.91 14.97 15.06 15.15 15.18 15.21 15.25 15.29 15.43 15.56 Coulsdon NO 11kV 22.73 5.49 0.99 29.57 29.51 29.53 29.60 29.70 29.74 29.79 29.85 29.92 30.18 30.42 Coulsdon YES 11kV 19.60 3.66 0.98 19.44 19.37 19.39 19.43 19.50 19.52 19.55 19.59 19.64 19.80 19.96 Croydon A 6.6kV YES 6.6kV 37.44 5.10 0.96 29.42 29.35 29.32 29.34 29.38 29.42 29.47 29.52 29.58 29.80 30.00 Croydon A 6.6kV YES 6.6kV 27.60 8.56 0.92 22.69 22.62 22.60 22.61 22.65 22.67 22.71 22.75 22.79 22.96 23.10 Croydon B NO 33kV 56.20 0.00 0.96 40.33 40.31 59.10 59.19 59.31 59.37 59.45 59.54 59.64 59.99 60.31 Croydon B NO 33kV 43.20 0.00 0.96 35.69 35.67 48.14 48.21 48.30 48.34 48.41 48.48 48.56 48.84 49.10 Croydon B RT YES 33kV 41.28 0.00 0.96 30.11 30.11 30.11 30.11 30.11 30.11 30.11 30.11 30.11 30.11 30.11 Croydon B RT YES 33kV 41.28 0.00 0.96 30.13 30.13 30.13 30.13 30.13 30.13 30.13 30.13 30.13 30.13 30.13 Croydon Central YES 11kV 39.62 0.00 0.99 4.86 4.90 5.01 5.11 5.20 5.20 5.20 5.20 5.21 5.23 5.25 Croydon Central YES 11kV 29.70 0.00 0.99 5.77 5.81 5.94 6.06 6.16 6.16 6.16 6.16 6.17 6.19 6.22 Croydon Energy NO 132kV 0.00 0.00 0.96 22.85 22.85 22.85 22.85 22.85 22.85 22.85 22.85 22.85 22.85 22.85 Croydon Energy NO 132kV 0.00 0.00 0.96 19.12 19.12 19.12 19.12 19.12 19.12 19.12 19.12 19.12 19.12 19.12 Croydon Grid YES 33kV 113.20 0.00 0.99 86.82 86.80 68.48 68.99 69.46 69.52 69.61 69.72 69.85 70.35 70.83 Croydon Grid YES 33kV 89.10 0.00 0.99 74.42 74.44 62.50 63.08 63.60 63.64 63.71 63.79 63.89 64.31 64.71 Croydon Grid 11kV YES 11kV 37.60 0.00 0.99 16.37 16.48 16.82 17.16 17.44 17.44 17.45 17.46 17.48 17.55 17.64 Croydon Grid 11kV YES 11kV 28.20 0.00 0.99 19.31 19.44 19.84 20.24 20.57 20.57 20.58 20.59 20.61 20.70 20.80 Croydon Grid 132kV NO 132kV 0.00 0.00 0.96 81.83 81.81 63.45 63.93 64.38 64.43 64.52 64.62 64.74 65.22 65.67 Croydon Grid 132kV NO 132kV 0.00 0.00 0.96 73.95 73.96 62.02 62.60 63.11 63.15 63.22 63.30 63.40 63.82 64.21 East Croydon YES 6.6kV 23.04 0.00 0.96 16.46 16.45 16.48 16.52 16.56 16.57 16.59 16.61 16.63 16.72 16.79 East Croydon YES 6.6kV 18.40 4.49 0.92 14.01 14.00 14.02 14.05 14.09 14.10 14.11 14.13 14.15 14.22 14.28 Norbury YES 6.6kV 23.52 0.00 0.98 0.00 0.00 18.77 18.81 18.88 18.90 18.95 18.99 19.05 19.26 19.45 Norbury YES 6.6kV 19.00 0.00 0.95 0.00 0.00 12.46 12.51 12.57 12.60 12.64 12.69 12.74 12.96 13.15 Norbury 441 YES 6.6kV 23.52 0.00 0.98 18.82 18.76 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Norbury 441 YES 6.6kV 19.00 0.00 0.95 12.51 12.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Nork YES 11kV 22.70 0.00 0.99 13.30 13.29 13.36 13.45 13.54 13.55 13.58 13.61 13.65 13.78 13.91 Nork YES 11kV 19.40 0.00 0.97 9.79 9.79 9.83 9.90 9.96 9.97 9.99 10.02 10.04 10.14 10.22 North Cheam YES 11kV 21.50 0.00 0.99 17.67 17.68 17.80 17.97 18.14 18.20 18.28 18.36 18.47 18.72 18.97 North Cheam YES 11kV 17.46 0.00 0.97 11.91 11.91 12.00 12.10 12.21 12.25 12.30 12.36 12.43 12.60 12.76 Prologis 132/11 YES 11kV 36.60 0.00 0.96 22.28 22.28 22.28 22.28 22.28 22.28 22.28 22.28 22.28 22.28 22.28 Prologis 132/11 YES 11kV 28.80 0.00 0.96 24.03 24.03 24.03 24.03 24.03 24.03 24.03 24.03 24.03 24.03 24.03 Purley Grid YES 33kV 95.50 25.79 0.96 87.61 87.48 87.72 88.11 88.56 88.70 88.91 89.14 89.41 90.28 91.10 Purley Grid YES 33kV 83.40 24.67 0.96 51.54 51.41 51.55 51.78 52.03 52.11 52.23 52.36 52.51 53.00 53.47 Purley Local YES 11kV 47.20 0.00 0.99 28.19 28.15 28.22 28.35 28.51 28.58 28.67 28.77 28.89 29.23 29.55 Purley Local YES 11kV 34.60 0.00 0.96 18.47 18.43 18.48 18.56 18.66 18.70 18.76 18.83 18.90 19.12 19.32 Selhurst YES 6.6kV 22.18 0.00 0.97 14.87 14.84 14.83 14.84 14.86 14.86 14.88 14.90 14.92 15.01 15.09 Selhurst YES 6.6kV 17.25 0.00 1.00 8.60 8.57 8.56 8.56 8.57 8.58 8.59 8.60 8.61 8.66 8.70 Selsdon YES 11kV 22.77 0.00 0.99 16.29 16.31 16.48 16.68 16.87 16.90 16.95 17.00 17.06 17.26 17.46 Selsdon YES 11kV 19.40 0.00 0.97 13.80 13.81 13.95 14.12 14.28 14.30 14.34 14.38 14.43 14.59 14.76 Shirley YES 11kV 23.00 0.00 1 17.18 17.19 17.32 17.48 17.63 17.67 17.73 17.78 17.85 18.06 18.26 Shirley YES 11kV 19.60 0.00 0.98 10.56 10.57 10.64 10.74 10.83 10.86 10.89 10.93 10.97 11.09 11.21 St Helier YES 11kV 22.50 4.13 0.98 22.33 22.27 22.29 22.36 22.47 22.56 22.66 22.78 22.92 23.26 23.59 St Helier YES 11kV 18.40 0.00 0.92 13.93 13.87 13.88 13.93 14.00 14.05 14.11 14.18 14.26 14.47 14.67 Suffolk Road 973 YES 6.6kV 22.20 0.00 0.97 11.83 11.84 11.98 12.16 12.33 12.37 12.43 12.49 12.56 12.79 13.00 Suffolk Road 973 YES 6.6kV 16.70 0.00 0.93 7.13 7.14 7.22 7.32 7.43 7.45 7.48 7.52 7.56 7.70 7.82 Sutton A YES 11kV 23.10 0.00 0.98 13.71 13.73 13.87 14.05 14.23 14.28 14.36 14.44 14.54 14.80 15.04 Sutton A YES 11kV 16.74 0.00 0.93 11.37 11.38 11.49 11.63 11.78 11.82 11.88 11.95 12.02 12.23 12.42 Sutton B YES 11kV 22.90 9.60 0.96 31.31 31.27 31.30 31.38 31.49 31.56 31.66 31.76 31.89 32.20 32.48 Sutton B NO 11kV 19.20 0.00 0.96 21.51 21.47 21.49 21.54 21.62 21.66 21.72 21.79 21.87 22.08 22.26 Sutton Grid YES 33kV 106.40 0.00 0.95 93.92 93.83 94.20 94.76 95.39 95.66 96.03 96.43 96.90 98.15 99.32 Sutton Grid YES 33kV 85.40 0.00 0.95 65.70 65.61 65.88 66.27 66.71 66.89 67.14 67.42 67.73 68.58 69.38 Sutton Total YES 11kV 68.58 0.00 0.96 43.17 43.14 43.31 43.55 43.83 43.95 44.11 44.29 44.50 45.04 45.54 Sutton Total YES 11kV 53.76 0.00 0.96 31.85 31.82 31.95 32.14 32.35 32.44 32.56 32.69 32.84 33.24 33.61 West Croydon YES 11kV 22.30 0.00 0.97 14.00 13.99 14.05 14.13 14.20 14.22 14.25 14.28 14.31 14.43 14.54 West Croydon YES 11kV 18.20 0.00 0.91 10.54 10.53 10.58 10.63 10.69 10.70 10.72 10.74 10.76 10.85 10.93 West Wickham YES 11kV 22.30 2.42 0.97 19.86 19.83 19.88 19.96 20.06 20.11 20.17 20.24 20.32 20.54 20.75 West Wickham YES 11kV 19.40 0.00 0.97 12.68 12.66 12.69 12.74 12.80 12.83 12.87 12.91 12.96 13.09 13.22

Regional Development Plan Template v1.1 Page 18 of 44 Regional Development Plan

Beddington

Table 11 above illustrates the firm capacity figures and projected load growth for all substations covered in this RDP. Figureshighlighted in brown depict sites where firm capacity is exceeded and five substations have their firm capacity exceeded. Beddington GSP is a class E site in terms of P2/6 compliance. The site is P2/6 compliant for both N-1 conditions and N-2 conditions as required. Work is already in progress to to address the firm capacity violation at Coulsdon primary and Croydon B grid while Sutton B primary relies on an auto switching scheme to Sutton A for firm capacity compliance.

The firm capacity for Croydon B will be addressed once the new 33kV interconnector between Croydon Grid and Croydon B is completed, which will facilitate the parallel running arrangement arrangement for the two sites.

Table 12. LI Profile (Without Investment)

Voltage Load Index Substation (kV) 2015 2023 Beddington SGT 400/132 LI1 LI1 Prologis 132/11 132/11 LI1 LI1 Beddington Local 132/11 LI1 LI1 Bridges Lane 132/11 LI1 LI1 Beddington 132/33 132/33 LI1 LI1 East Croydon 33/6.6 LI1 LI1

Addington Grid 132/33 LI2 LI2 Addington Grid 33/11 33/11 LI1 LI1 Addington Local 33/11 LI2 LI2 Biggin Hill 33/11 LI1 LI1 Selsdon 33/11 LI1 LI1 West Wickham 33/11 LI2 LI2

Ashburton Grid 132/33 LI1 LI1 Selhurst 33/6.6 LI1 LI1 Suffolk Road 973 33/6.6 LI1 LI1 Shirley 33/11 LI1 LI1

Croydon B 132/33 LI5 LI5 Bensham Grove 33/6.6 LI1 LI1

Croydon Grid 132/33 LI1 LI1 Croydon Central 33/11 LI3 LI4 Croydon A 6.6kV 33/6.6 LI2 LI2 Croydon Grid 11kV 33/11 LI1 LI1 Norbury 33/6.6 LI1 LI2 Spurgeons Bridge 33/16.6 LI1 LI1

Purley Grid 132/33 LI2 LI3 Caterham 33/11 LI3 LI3 Coulsdon 33/11 LI1 LI2 Purley Local 33/11 LI1 LI1 West Croydon 33/11 LI1 LI1

Sutton Grid 132/33 LI2 LI2 Nork 33/11 LI1 LI1 North Cheam 33/11 LI2 LI2 St Helier 33/11 LI3 LI5 Sutton A 33/11 LI1 LI1 Sutton B 33/11 LI5 LI5

Regional Development Plan Template v1.1 Page 19 of 44 Regional Development Plan

Beddington 3.4 Operational and technical restrictions Table 13. - Three Phase Fault Level Analysis (DIgSILENT Output)

Busbar S/Stn Grid Sk" Ik" Ik' ip Ib ib MVA kA kA kA kA kA B2 Addington Grid 11kVGrid - UKPN & National Grid106.4799 5.588745 4.950664 14.49118 5.093039 10.79446 REAR B1 Addington Grid 33Grid KV - UKPN & National Grid811.0223 14.18921 12.31941 35.27906 12.73662 23.06068 REAR B2 Addington Grid 33Grid KV - UKPN & National Grid811.0236 14.18923 12.31943 35.27927 12.73664 23.06083 FRONT B3Addington Grid 33Grid KV - UKPN & National Grid 811.022 14.1892 12.31941 35.27916 12.73662 23.06084 B1 Addington Local 11kVGrid - UKPN & National Grid100.6753 5.284084 4.769776 13.50357 4.884533 9.46736 B2 Addington Local 11kVGrid - UKPN & National Grid108.0923 5.673373 4.750765 14.23019 4.956627 9.638913 B3 Addington Local 11kVGrid - UKPN & National Grid108.0911 5.67331 4.750712 14.22872 4.956571 9.635156 B1 Ashburton Grid 33KVGrid - UKPN & National Grid648.2017 11.34059 10.24437 29.40503 10.48897 21.61216 B2 Ashburton Grid 33KVGrid - UKPN & National Grid648.2016 11.34059 10.24436 29.40501 10.48896 21.6121 B1 Beddington 33kVGrid - UKPN & National Grid664.0069 11.61711 10.94136 31.04458 11.09214 25.03267 B2 Beddington 33kVGrid - UKPN & National Grid664.0069 11.61711 10.94136 31.04457 11.09214 25.03255 B1 Bensham Grove 6.6kVGrid - UKPN & National Grid88.47607 7.739649 6.614838 18.45812 6.865817 11.13216 B3 Bensham Grove 6.6kVGrid - UKPN & National Grid89.17801 7.801052 6.677853 19.13647 6.928473 12.12302 B1 Biggin Hill 11kV Grid - UKPN & National Grid 179.504 9.421516 8.338582 22.69352 8.580218 14.02438 B2 Biggin Hill 11kV Grid - UKPN & National Grid 179.504 9.421518 8.338583 22.69352 8.580219 14.02433 B1 Caterham 11kV Grid - UKPN & National Grid192.5443 10.10595 8.492236 24.67605 8.852305 15.50344 B2 Caterham 11kV Grid - UKPN & National Grid192.5441 10.10594 8.492228 24.67603 8.852296 15.50392 B1 Coulsdon 11kV Grid - UKPN & National Grid226.8143 11.90466 9.63658 29.02288 10.14266 18.16314 B2 Coulsdon 11kV Grid - UKPN & National Grid226.8165 11.90478 9.63664 29.02386 10.14273 18.16387 B3 Coulsdon 11kV Grid - UKPN & National Grid226.8156 11.90473 9.636636 29.024 10.14272 18.16428 Front B1 Croydon A 6.6kVGrid - UKPN & National Grid111.7079 9.771911 7.197446 24.55788 7.771886 18.46039 Front B2 Croydon A 6.6kVGrid - UKPN & National Grid111.7079 9.771911 7.197446 24.55788 7.771887 18.46036 Rear B3 Croydon A 6.6kVGrid - UKPN & National Grid111.7448 9.775135 7.200257 24.57144 7.77479 18.49295 Rear B4 Croydon A 6.6kVGrid - UKPN & National Grid111.7448 9.775135 7.200257 24.57144 7.77479 18.49294 B1 New Croydon B 33kV Grid - UKPN & National Grid 462.22 8.086752 7.578984 22.01185 7.692282 19.55764 B2 New Croydon B 33kV Grid - UKPN & National Grid462.2194 8.086742 7.578974 22.01153 7.692272 19.55627 B1 Croydon Central 11kVGrid - UKPN & National Grid212.9664 11.17784 9.848287 28.94336 10.14495 21.4958 B2 Croydon Central 11kVGrid - UKPN & National Grid212.9664 11.17784 9.848287 28.94336 10.14495 21.4958 B1 Croydon Grid 11kVGrid - UKPN & National Grid134.6637 7.068012 6.063458 18.24684 6.287604 13.63826 B2 Croydon Grid 11kVGrid - UKPN & National Grid134.3154 7.049733 6.046197 18.20368 6.270116 13.62162 Rear B1 Croydon Grid 33kVGrid - UKPN & National Grid765.5683 13.39397 11.14722 34.10157 11.64854 24.34961 Rear B2 Croydon Grid 33kVGrid - UKPN & National Grid765.5707 13.39401 11.14725 34.10185 11.64857 24.34979 Front B3 Croydon Grid 33kVGrid - UKPN & National Grid765.5657 13.39393 11.14717 34.09912 11.64849 24.34127 B1 East Croydon 6.6kVGrid - UKPN & National Grid 191.876 16.7848 14.20235 41.32962 14.77857 26.40695 B2 East Croydon 6.6kVGrid - UKPN & National Grid 191.876 16.7848 14.20235 41.32962 14.77857 26.40695 B1 Norbury 6.6kV Grid - UKPN & National Grid101.7714 8.902688 7.826718 21.78189 8.0668 13.78116 B2 Norbury 6.6kV Grid - UKPN & National Grid101.1736 8.850397 7.776839 21.6557 8.016383 13.70215 B1 Nork 11kV Grid - UKPN & National Grid187.0347 9.816777 8.677096 25.12049 8.931393 17.91644 B2 Nork 11kV Grid - UKPN & National Grid187.0354 9.816811 8.677113 25.12069 8.931414 17.91656 B3 Nork 11kV Grid - UKPN & National Grid187.0348 9.816779 8.677098 25.12054 8.931395 17.91653 B1 North Cheam 11kVGrid - UKPN & National Grid195.4755 10.2598 8.751991 25.86187 9.088429 17.7597 B2 North Cheam 11kVGrid - UKPN & National Grid195.4798 10.26003 8.752168 25.86698 9.088617 17.77241 B3 North Cheam 11kVGrid - UKPN & National Grid195.4789 10.25998 8.752148 25.86674 9.088591 17.77231 B1 Purley Grid 33kVGrid - UKPN & National Grid925.4836 16.19176 13.94633 41.64533 14.44736 30.46003 B2 Purley Grid 33kVGrid - UKPN & National Grid925.4856 16.1918 13.94636 41.64555 14.44738 30.45992 B3 Purley Grid 33kVGrid - UKPN & National Grid 925.485 16.19179 13.94635 41.64546 14.44737 30.45965 B1 Purley Local 11kVGrid - UKPN & National Grid277.2163 14.55008 12.15652 37.27507 12.6906 27.5078 B2 Purley Local 11kVGrid - UKPN & National Grid277.2163 14.55008 12.15652 37.275 12.6906 27.50748 B3 Purley Local 11kVGrid - UKPN & National Grid277.2208 14.55032 12.15668 37.27892 12.69077 27.51913 B1 Selhurst 6.6kV Grid - UKPN & National Grid96.31302 8.425205 7.418937 21.69519 7.643466 15.81737 B2 Selhurst 6.6kV Grid - UKPN & National Grid96.20385 8.415655 7.409635 21.67216 7.634108 15.80612 B1 Selsdon 11kV Grid - UKPN & National Grid188.7862 9.908707 8.591061 24.91477 8.885068 16.79157 B2 Selsdon 11kV Grid - UKPN & National Grid188.7862 9.908706 8.591061 24.91477 8.885067 16.79159 B1 Shirley 11kV Grid - UKPN & National Grid 176.384 9.257757 8.041425 23.3984 8.312826 16.02313 B2 Shirley 11kV Grid - UKPN & National Grid176.3846 9.257793 8.041442 23.39857 8.312846 16.02318 B3 Shirley 11kV Grid - UKPN & National Grid176.3812 9.257614 8.041301 23.39431 8.312697 16.01288 B1 Spurgeons BridgeGrid 6.6kV - UKPN & National Grid 102.362 8.954351 7.918809 23.71592 8.14987 19.47612 B2 Spurgeons BridgeGrid 6.6kV - UKPN & National Grid102.3479 8.953123 7.917621 23.70934 8.148673 19.45746 B1 St Helier 11kV Grid - UKPN & National Grid200.3605 10.5162 8.713552 25.88228 9.115777 16.65213 B2 St Helier 11kV Grid - UKPN & National Grid200.3604 10.51619 8.713549 25.88223 9.115773 16.65212 B1 Suffolk Road 6.6kVGrid - UKPN & National Grid155.9455 13.6417 12.22486 36.04778 12.541 28.95539 B2 Suffolk Road 6.6kVGrid - UKPN & National Grid 155.947 13.64182 12.22492 36.04795 12.54107 28.95268 B3 Suffolk Road 6.6kVGrid - UKPN & National Grid155.9461 13.64175 12.22487 36.04706 12.54102 28.94944 Terminal(5)Sutton A 11kV Grid - UKPN & National Grid160.9317 8.446723 6.160376 21.59877 6.670529 18.33981 B2 Sutton A 11kV Grid - UKPN & National Grid160.9317 8.446723 6.160376 21.59877 6.670529 18.33981 B3 Sutton A 11kV Grid - UKPN & National Grid 201.595 10.581 8.853653 27.05454 9.239075 20.05536 B3 Sutton B 11kV Grid - UKPN & National Grid 202.786 10.6435 8.897213 27.2842 9.286863 20.42313 B4 Sutton B 11kV Grid - UKPN & National Grid202.7856 10.64348 8.897195 27.28422 9.286845 20.42337 B1 Sutton Grid 33kVGrid - UKPN & National Grid871.3807 15.24521 12.85528 39.61772 13.38854 30.84375 B2 Sutton Grid 33kVGrid - UKPN & National Grid871.3805 15.2452 12.85527 39.61772 13.38854 30.84419 B1 West Croydon 11kVGrid - UKPN & National Grid189.2127 9.931094 8.735037 25.05052 9.001913 17.05104 B2 West Croydon 11kVGrid - UKPN & National Grid189.2134 9.93113 8.735054 25.05072 9.001934 17.05114 B3 West Croydon 11kVGrid - UKPN & National Grid189.2097 9.930934 8.734894 25.0459 9.001767 17.04009 B1 West Wickham 11kVGrid - UKPN & National Grid188.8096 9.909933 8.34791 24.08713 8.696444 14.95321 B2 West Wickham 11kVGrid - UKPN & National Grid188.8096 9.909933 8.34791 24.08713 8.696444 14.95321

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Beddington 3.5 National Grid National Grid’s (NG) supply for Beddington Grid is secure until at least 2020 based on extrapolated load growth data by NG. SPN owns the 132kV busbars, bus-sections, bus-couplers and operates the site. The GIS substation has 40kA rated switchgear, albeit derated to 31.5kA due to a 120ms DC Time Constant. The SPN demand is supplied by 4 SGTs coupled onto a 132kV bus coupler split busbar with an auto-close facility which runs the site solid following single SGT outage. The combined demand of the site is >300MW (CAT E) where (FCO = 1x240; SCO = 2x240) for P2/6 compliance. The Modification Notice issued by National Grid for the asset replacement of SGT3B was been accepted by UKPN and development works are underway to support the asset replacement completion date of October 2013 by NG. National grid has indicated that asset replacement of SGT1B would take place in 2016. NG’s proposed location for SGT1B would prevent the extension of the new 132kV substation in future. UKPN’s IDP Co-ordinator will raise this issue with NG in writing in due course. During the last JTMP meeting NG advised SPN that they are reviewing their future strategy for the Beddington site. It considers the asset replacement of the 275/132kV SGTs with 400/132kV SGTs with the potential development of a new 400kV GIS substation on land released following the 132KV AIS replacement with the GIS in around 2019. This development will impact the existing land lease arrangement with NG.

3.6 Network Constraints The cable pinch point identified in table 14 below is located in Sutton. Table 14. - Cable Constraints

Post Mitigation New Site Asset Name Site Name Parish Gis Ref CB No Voltage Assessed Recommended Mitigations Completed Number Code (Yes/No) BETWEEN RAILWAY LINES The access needs to be made to the brige so a proper 1102 1102BR Sutton TQ2632963948 CB021 SM1 4TE 132 Yes inspection can be carried out, the vegitation needs No LANGLEY PK RD SUTTON clearing and the property label updating.

3.7 Smart Solutions

Studies are still in progress to determine the level of investment and benefits that can be derived from various smart solutions initiatives.

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Beddington 4. RECOMMENDED STRATEGY The network strategy for this area is designed to ensure: - Continued adherence to the security of supply criteria defined in Engineering Recommendation P2/6 - Maintaining reliable network operation by asset replacement, or refurbishment, of poorly performing equipment identified through asset condition monitoring (HI) techniques Whenever possible the asset replacement and reinforcement works are to be co-ordinated to achieve an efficient economic solution. The Croydon Metropolitan Centre regeneration offers both challenges and opportunities for network development. The forecast maximum demand of circa 22MW can be supplied from the adjacent Croydon Central 33/11kV primary substation. However any demand beyond the existing firm capacities of Croydon Grid 33/11kV, Croydon A 33/6.6KV, Croydon Central 33/11kV and East Croydon 33/11kV will require the establishment of a new primary substation in the Croydon north area to be named Croydon North 33/11kV substation. Initial feasibility studies carried out suggest that the new primary substation can be supplied form Ashburton Grid, which currently has a firm capacity of 112.3MW (W) and 86.4MW (S) and projected load demand of 85.7MW (W) by 2023. The 132kV gas compression cables from Beddington GSP to Purley Grid are HI5 and due for replacement during the DPCR5 period. The cables will be replaced with higher rating XLPE city cables using the existing gas cable pipes, which is expected to increase firm capacity at Purley Grid to the full potential of the grid transformers and 33kV circuit breakers (114MVA-W and 90MVA -S). Currently Beddington 132/33kV transformers are being replaced with higher rated 60MVA transformers. However the 200m 33kV tails form the grid transformers to the 33kV switchboard will limit the firm capacity to 32.8MW (W) and 27.3MW (S). Uprating of the transformer tails will significantly boost the firm capacity to the full potential of the new transformers and existing 33kV CB’s rating (71MW – W and 55MW – S). Once the firm capacity at Beddington 132/33kV is increased, St Helier primary may be transferred from Sutton Grid to Beddington 132/33kV to address the projected firm capacity deficit at Sutton Grid during 2019.

4.1 Asset Replacement The following projects are identified in this RDP as interventions to address assets with poor health indices: - 3138 - Beddington/Purley - Gas Pressure Cable Replacement (2012 - 2014) The condition assessment of the Beddington / Purley Gas Pressure Cables has shown that the probability of failure due to degradation of this asset and associated risks to the network are unacceptable. It is not possible to keep this asset in use without compromising operational requirements, therefore this project recommends overlaying these circuits. The project has already passed Gate B and awaiting Gate C development including contigency support for the 33kV network in the event of N-2 conditions.

3256 - Addington Local - Replace 11kV switchgear. (2019-2020) The 11kV switchboard has been condition assessed and classified as condition HI3/4/5 during ED1. Therefore this project recommends the replacement of the existing 11kV switchboard with 2000A 20kA switchboard to match the proposed substation ITC under project number 7873 .

3306 - Beddington 132/33kV - Replace GT3 and GT4 (2009 - 2012) GT3 and GT4 at Beddington Local 132/33kV have been condition assessed and classified as having a health index of 150. Therefore this project recommends to replace GT3 and GT4 together with their auxiliary transformers and LVAC supplies/control systems. Work to replace these transformers is already in progress and scheduled for completion by the end of 2012. The transformers are being replaced with higher rated transformers (2x60MVA), which requires uprating the existing transformer tails in order to utilise the new the transformer capacity. 3742 – West Wickham – Replace 11kV Switchboard/ITC

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Beddington The condition assessment of the 1959 - 64 Reyrolle C gear Oil Switchgear installed at West Wickham 33/11kV has shown that the probability of failure due to degradation will become unacceptable and HI3/4 during ED1 period. It is not possible to keep these assets in use without compromising operational requirements, therefore this project recommends its replacement in order to match the proposed ITC of the site under project 7915 for transformer replacement due to poor asset health. Completion of the project will see 11 circuit breakers replaced with 11 new circuit breakers. 3831 - Purley Local - Replace T1 and T2 (2010 - 2012) Purley Local primary is equipped with three transformers. T1 and T2 are 20 MVA units equipped with slow speed tap- changers, Oil quality is poor and high FFA. Both units were condition assessed and classified as having poor health index. Therefore, it is proposed to replace them with new 2x20/40 MVA units to allow for future load growth. These transformers have now been replaced with new 12/24MVA units. 5829 - North Cheam 33/11kV - Retrofit 11kV Switchgear (2015-2016) The condition assessment of the 1963 South Wales Switchgear C4X Oil Switchgear installed at North Cheam 33/11kV has shown that the probability of failure due to degradation will become unacceptable and projected to be in HI4/5 during ED1 period. It is not possible to keep these assets in use without compromising operational requirements, therefore this project recommends its refurbishment. Completion of the project will see 13 circuit breakers refurbished. 7822 - Biggin Hill 33kV - Retrofit 11kV Switchgear (2020-2021) The condition assessment of the 1964 Reyrolle C gear Oil Switchgear installed at Biggin Hill 33kV has shown that the probability of failure due to degradation will become unacceptable. It is not possible to keep these assets in use without compromising operational requirements, therefore this project recommends its Refurbishment. Completion of the project will see 6 circuit breakers refurbished. 7823 - Caterham 33/11kV - Replace 11kV Switchgear (2018-2020) The condition assessment of the 1960 - 62 Reyrolle C gear Oil Switchgear installed at Caterham 33/11kV has shown that the probability of failure due to degradation will become unacceptable and will be HI 3/4/5 during ED1 period. It is not possible to keep these assets in use without compromising operational requirements, therefore this project recommends its replacement. Completion of the project will see 12 circuit breakers replaced with 12 new circuit breakers. This project will be optimised with project 8053 for ITC. 7846 - Spurgeons Bridge - Retrofit 11kV Switchgear (2020-2022) The condition assessment of the 1966 Reyrolle LMT Oil Switchgear installed at Spurgeons Bridge has shown that the probability of failure due to degradation will become unacceptable and will be HI3/4 during ED1 period. It is not possible to keep these assets in use without compromising operational requirements, therefore this project recommends its Refurbishment. Completion of the project will see 18 circuit breakers refurbished.

7873 - Addington Local - Replace Primary Transformers (T1, T2) (2018-2020) The condition assessment of the 1956 Fuller Electric Primary Transformers with Fuller HS tap changers installed at Addington Local has shown that the probability of failure due to degradation will become unacceptable with HI5 rating. It is not possible to keep these assets in use without compromising operational requirements. Therefore this project recommends the replacement of T1 and T2. As the predicted load at Addington Local will exceed the existing firm capacity, the two 16/20 MVA units will be replaced with larger 20/40 MVA transformers to cater for increased load. Completion of the project will see 2 x 16 MVA primary transformers replaced with 2 x 20/40MVA transformers. This project is linked 3256 to replace the existing 11kV switchboard owing to poor asset health. 7881 - Croydon B 132kV - Remove Grid Transformer (GT2) (2015-2016) The condition assessment of the 1948 C.A. Parsons Grid Transformer with Fuller H tap changer installed has shown that the probability of failure due to degradation will become unacceptable with HI5. It is not possible to keep this asset in use without compromising operational requirements, therefore this project recommends its removal

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Beddington following LRE circuit transfers to the new 33kV switchboard. Completion of the project will see 1 Grid Transformer removed from service. 7884 - East Croydon 33/6.6kV - Replace Primary Transformer (T1, T2) (2020-2022) The condition assessment of the 1962 Hackbridge Hewitt Primary Transformers with Fuller HS tap changers installed has shown that the probability of failure due to degradation will become unacceptable with HI4/5 during ED1 period. It is not possible to keep these assets in use without compromising operational requirements, therefore this project recommends its replacement. Completion of the project will see 2 Primary Transformers replaced with 2 new Primary Transformers.

7905 - Shirley 33/11kV - Refurbish Primary Transformer (T1) The condition assessment of the 1967 AEI Primary Transformer with Fuller HS tap changer installed at has shown that the probability of failure due to degradation will become unacceptablewith HI5. It is not possible to keep this asset in use without compromising operational requirements, therefore this project recommends its refurbishment. Completion of the project will see 1 Transformer refurbished.

7915 - West Wickham 33/11kV - Replace Primary Transformer (T1, T2) (2016-2019) The condition assessment of the T2 1966/67 English Electric Primary Transformers with Fuller HS tap changers installed at has shown that the probability of failure due to degradation will become unacceptable with HI3/5 during ED1 period. It is not possible to keep these assets in use without compromising operational requirements, therefore this project recommends replacement and increased rating. T1 will be replace for load reinforcement. Completion of the project will see 2 primary transformers replaced with 2 new 20/40MVA primary transformers. This project is linked to project number 3742 for 11kV switchgear replacement on poor asset health. 7929 - St Helier 33/11kV - Replace 11kV Switchgear (2021-2022) The condition assessment of the 1965 Reyrolle LMT oil switchgear installed at ST HELIER 33/11kV has shown that the probability of failure due to degradation will become unacceptable with HI3/8 during ED1 period. It is not possible to keep these assets in use without compromising operational requirements, therefore this project recommends its Refurbishment. Completion of the project will see 11 circuit breakers refurbished. This project is linked to project number 8059 for ITC. 7965 - Purley Grid-West Croydon 33/11 (Circuit 2-A-C & 2-C-F) - 33kV FFC replacement (2021-2022) The condition assessment of the Purley Grid-West Croydon 33/11 33kV Fluid filled cable has shown that the probability of failure due to degradation will become unacceptable. It is not possible to keep these assets in use without compromising CI and CML performance, therefore this project recommends the replacement. Completion of the project will see 2.763 km of 33kV Fluid filled cable replaced 7970 - Beddington Local 33kV-Sutton Grid 33kV (Circuit 1-E-J & Circuit 2-E-J) - 33kV FFC replacement (2014-2015) The condition assessment of the Beddington Local 33kV-Sutton Grid 33kV 33kV Fluid filled cable has shown that the probability of failure due to degradation will become unacceptable. It is not possible to keep these assets in use without compromising CI and CML performance, therefore this project recommends the replacement. Completion of the project will see 5 km of 33kV Fluid filled cable replaced 7973 - Beddington-Addington Grid (Circuit 1-A-B-P3,Circuit 1-D-E-P2,Circuit 1-E-F-P1, Circuit 2-DE1-P3,Circuit 1-B-D- P3,Circuit 1-B-D-P2) - 132kV Fluid filled cable replacement (2016-2017) The condition assessment of the Beddington-Addington Grid 132kV Fluid filled cable has shown that the probability of failure due to degradation will become unacceptable. It is not possible to keep these assets in use without compromising CI and CML performance, therefore this project recommends the replacement. Completion of the project will see 8 km of 132kV Fluid filled cable replaced 8434 - Sutton Grid 132kV - Refurbish Grid Transformer (GT2) (2013)

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Beddington GT2 at Sutton Grid 132kV has severe oil leaks requiring urgent action. It is proposed to refurbish this Grid Transformer including regasketing and repair of a broken bushing.

4.2 Reinforcement The following projects are identified in this RDP as reinforcement projects to improve network reliability and resilience: -

3190 - Coulsdon 33/11kV Primary - Reinforcement (2009 - 2014) The predicted load at Coulsdon Primary will exceed the existing firm capacity, including the transfer capacity to Purley Local. Currently there are two transformers T1 16/20MVA and T2 20/40MVA. It is proposed to replace T1 with a larger unit. The existing 33kV circuits supplying the transformers are currently rated for the smaller unit T1. It is therefore proposed to replace one of these circuits and double up the existing circuits. The existing 11kV switchgear is not fully rated for this increased load. It is therefore proposed to replace this switchgear. This project interacts with project 3691 to reinforce the adjacent Banstead Primary. Once Coulsdon is reinforced, enhanced 11 kV interconnection with Banstead might defer the need for EHV reinforcement at Banstead. Reinforcement work at Coulsdon primary is underway and the site will be relocated to a new piece of land, which can adequately accommodate the proposed reinforcement works without putting customers at risk of loss of supply.

3236 - Norbury Primary - Transfer Load to Croydon B (2012 - 2014) This project proposes the transfer of Norbury 33/6.6kV primary substation from Croydon Grid to Croydon B 33kV. This will reduce the demand at Croydon Grid which would otherwise exceed its firm capacity. The Norbury 33 kV circuits pass close to Croydon B and this option is more cost effective than reinforcing Croydon Grid. Work to transfer Norbury primary from Croydon Grid to Croydon B and introduce a new 33kV interconnector between the two sites is scheduled to start during 2012 and complted by 2014.

3351 - Sutton B 33/11kV Reinforcement-ITC (2015-2017) The predicted load at Sutton B 33kV/11kV will exceed the existing rating of the associated transformer circuits. It is not possible to lower the load without compromising operational and planning requirements. It is therefore proposed to increase transformer circuit capacity by replacing 2 x 16/20 MVA transformers with 2 x 40 MVA transformer/s, replacing 0.6 km of 33kV underground cable from Sutton Grid. Completion of this project will see the tranformer feeder circuit uprated by addition of 2 x 33kV/11kV transformer/s and replacement of 0.6 km of 33kV underground cable 3627 - Addington Grid 132/33 kV Reinforcement: Transfer of Addington Local to Ashburton Grid (2016-2019) The predicted load on Addington Grid S/S is nearing the existing firm capacity, which is restricted by the rating of the 132 kV feeder circuits between Beddington and Addington Grid. Whilst it is possible to increase the capacity a more economic solution would be to transfer the load. It is proposed to transfer Addington Local to Ashburton Grid. This will require the installation of a new 3km 33kV double circuit cable route from Asburton Grid to directly supply the transformers at Shirley. The 33kV interconnectors Ashburton to Addington will be retained, and the Addington Local circuits at Addington Grid will be transferred onto the Addington to Ashburton Interconnector cable boxes. The normal open point on the Interconnectors will be at Addington. This will reduce demand on Addington Grid, keeping it within firm capacity.

5631 - Croydon 'B': Modified Running arrangement for Croydon 'B' and Croydon Grid (2011) Croydon Grid and Croydon B were running as two separate substations: Croydon Grid with two 90MVA transformers and Croydon B with one 90MVA transformer and one old 45MVA transformer. Due to the poor condition of GT2, it is proposed to decommission GT2(1948) at Croydon 'B' and to operate Croydon B and Croydon Grid in parallel through the 60MVA interconnector. This project facilitates a review of protection and automatic voltage regulation to ensure that these are suitable for the new running arrangement. Work to modofy the running arrangement for Croydon Grid and Croydon B will be initiated as soon as the new 33kV interconnector is established. 7873 - Addington Local - Replace Primary Transformers (T1, T2) (2018-2020)

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Beddington The condition assessment of the 1956 Fuller Electric Primary Transformers with Fuller HS tap changers installed at Addington Local has shown that the probability of failure due to degradation will become unacceptable with HI5 rating. It is not possible to keep these assets in use without compromising operational requirements. Therefore this project recommends the replacement of T1 and T2. As the predicted load at Addington Local will exceed the existing firm capacity, the two 16/20 MVA units will be replaced with larger 20/40 MVA transformers to cater for increased load. Completion of the project will see 2 x 16 MVA primary transformers replaced with 2 x 20/40MVA transformers. This project is linked 3256 to replace the existing 11kV switchboard owing to poor asset health. 8053 - ITC Caterham 33/11kV primary from 2x16/20MVA to 2x20/40MVA (2017-2018) The predicted load at Caterham Primary will exceed the existing firm capacity, including the available transfer capacity by 2023. Currently there are 2x16/20MVA transformers installed. It is proposed to replace existing transformers 20/40MVA units. The 33kV circuits have already been uprated under a FFC replacement project. This project will be optimised with the switchgear replacement project number 7823.

8057 - Norbury 33kV/6.6kV – ITC (2020-2023) The predicted load at Norbury 33kV/6.6kV will exceed the existing rating of the associated transformer circuits by 2023. It is not possible to lower the load without compromising operational and planning requirements. It is therefore proposed to increase transformer circuit capacity by replacing 16/20 MVA transformers with 20/40 MVA transformer/s, installing a 3rd 33kV x 5 km underground cable circuit from Croydon Grid and replacement of the 17 panel 6.6kV switchboard. Completion of this project will see the transformer feeder circuit uprated by addition of 2 x 40 MV A transformer/s installation of a 3rd 40 MVA 33kV cable circuit and banking of the existing circuits on one new transformer. 8059 - ITC St Helier 33/11kV primary from 2x16/20MVA to 2x20/40MVA (2014-2018) The predicted load at St Helier Primary will exceed the existing firm capacity, including the available transfer capacity by 2023. Currently there are 2x16/20MVA transformers installed. It is proposed to replace existing transformers 20/40MVA units and uprate existing and 33kV circuits from 23MVA to 40MVA.

8063 - ITC West Wickham 33/11kV primary from 2x16/20MVA to 2x20/40MVA (2014-2017) The predicted load at St Helier 33kV/11kV will exceed the existing rating of the associated transformer circuits. It is not possible to lower the load without compromising operational and planning requirements. It is therefore proposed to increase transformer circuit capacity by installing 2 x 40 MVA transformer/s in place of the 16/20MVA transformers, installing a 3rd 3 km x 40 MVA 33kV underground cable from Sutton Grid and replacement of an 11 panel 11kV switchboard. Completion of this project will see the transformer feeder circuit uprated by banking the existing circuits on the uprated T1, the new 40 MVA 33kV cable circuit on T1, addition of 2 x 40MVA transformer/s and replacement of 11 panel/s of 11kV switchboard. 8339 - Sutton A 33/11kV Reinforcement: Replacement of 11kV switchboard due to fault level The predicted fault level at Sutton A 33/11kV will exceed the existing rating of the associated 11kV switchboard and bus bars. It is not possible to lower the fault level without compromising operational and planning requirements. It is therefore proposed to replace the 12.5kA 14 panel switchboard with a new switchboard. Completion of this project will see 14 panel/s of 11kV switchboard replaced. 8445 - Beddington 132/33kV transformer tails reinforcement – 0.3km (2016-2017) The existing 30MVA transformers at Beddington 132/33kV are being replaced with new 60MVA transformer due to poor asset health. Despite the increase in transformers capacity, this will not be exploited since the existing 33kV transformer tails will limit the site firm capacity to 32.4MW (Winter) and 27.3MW (Summer). It is proposed to reinforce the existing 33kV tails to match the full potential of the newly installed transformers and increase firm capacity to 71MW (Winter) and 55MW (Summer).

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Beddington Table 15. – Summary of Proposed Interventions

Driver Existing New Firm Commissioning Substation Scope of works Firm capacity Year Capacity

Asset Replace 2.8km 33kV 22.3MW 22.3MW replacement FFC from Purley Grid to West Croydon 2023 West Croydon (Circuit 2-A-C & 2-C-F)

Asset Replace 5km 33kV replacement FFC from Beddington 22.3MW 22.3MW St Helier 2016 Local 33kV to Sutton Grid 33kV (Circuit 1- E-J & Circuit 2-E-J)

Asset retrofit Retrofit existing 11kV 21.5MW 21.5MW North Cheam 2016 SWS C4X switchboard

Asset Replace existing 22.5MW 22.5MW Addington replacement 2020 11kV Reyrolle C5 Local switchgear

Asset Replace 7.9km PQ1 83.4MW 83.4MW replacement 132kV (Circuit 1-A-B- P3,Circuit 1-D-E- Addington Grid 2018 P2,Circuit 1-E-F-P1, Circuit 2-DE1- P3,Circuit 1-B-D- P3,Circuit 1-B-D-P2) Asset Replace 0.1km 83.4MW 83.4MW Beddington replacement 132kV (Circuit 2) Main- 2017 132kV FFC Addington Grid

Biggin Hill Asset retrofit Retrofit 11kV 21.2MW 21.2MW 2021 switchgear

Caterham Asset Replace 11kV 22.77MW 22.77MW 2020 replacement switcgear

Spurgeons Asset retrofit Retrofit 11kV 22.3MW 22.4MW 2022 Bridge switchgear

West Wickham Asset Replace 11kV 22.77MW 22.77MW 2020 replacement switchgear

Croydon B Asset 56.2MW 117MW 2016 Decommission GT2 replacement

Sutton Grid Asset 108.4MW 108.4MW 2017 Refurbish GT2 refurbishment

Addington Asset 22.5MW 40MW (Winter) Replace T1 & T2 with Local - replacement & 2016 bigger units 30MW (Summer) ITC

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Driver Existing New Firm Commissioning Substation Scope of works Firm capacity Year Capacity

Shirley Asset 22MW 22MW 2017 Refurbish T1 refurbishment

West Wickham Asset 22.77MW 40MW (Winter) Replace T1 & T2 with replacement 2017 bigger units 30MW (Summer) and ITC

East Croydon Asset 22.04MW 40MW (Winter) replacement 2022 Replace T1 & T2 30MW (Summer)

Beddington Reinforcement transformer tails 32.8MW 71MW (Winter) 132/33kV 2016 reinforcement – 55MW (Summer) 0.3km

St Helier Reinforcement ITC from 22.3MW 40MW (Winter) 2x16/20MVA to 30MW (Summer) 2x20/40MVA and 2024 uprate existing 33kV circuits and 11kV switchboard

Table 15 above provides a list of all projects identified for implementation during ED1 period. Projects with coloured in similar highlighting indicate opportunities for combining asset replacement and reinforcement triggered projects in order to minimise costs and maximise benefits.

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Beddington 5.3 Costs and phasing Table 16. NAMP Table (2013-2024)

Table J Less Ind Baseline 14th June 2013 9:45_Official Frozen NAMP Cat Ref Description 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 /2011 /2012 /2013 /2014 /2015 /2016 /2017 /2018 /2019 /2020 /2021 /2022 A 1.07.07.3138 Beddington/Purley - Gas Pressure Cable Replacement 0 401 1,413 310 895 0 0 0 0 0 0 0

A 1.47.63.6097 Beddington 132/33kV Replace GT3 & GT4 (Civil) 0 10 30 0 0 0 0 0 0 0 0 0 A 1.50.01.3256 Addington Local. Replace 11kV switchgear. 0 0 0 0 0 0 0 0 557 1,526 0 0 A 1.50.01.5829 North Cheam Primary Substation - Retrofit 11kV 0 0 70 209 0 0 0 0 0 0 0 0 Switchgear A 1.50.01.7822 Biggin Hill 33kV - Retrofit 11kV Switchgear 0 0 0 0 0 0 0 0 0 23 68 0 A 1.50.01.7823 Caterham 33/11kV - Replace 11kV Switchgear 0 0 0 0 0 0 0 0 301 757 0 0 A 1.50.01.7846 Spurgeons Bridge - Retrofit 11kV Switchgear 0 0 0 0 0 0 0 0 0 0 108 173 A 1.50.01.7929 St Helier 33/11kV - Retrofit 11kV Switchgear 0 0 0 0 0 0 0 0 0 0 42 127 A 1.51.01.3306 Beddington 132/33kV - Replace GT3 and GT4 34 1,278 501 0 0 0 0 0 0 0 0 0 A 1.51.01.7881 Croydon B 132kV - Remove Grid Transformer (GT2) 0 0 0 0 55 166 0 0 0 0 0 0 A 1.51.03.3089 Bensham Grove - Replace T1 & T2 151 0 0 0 0 0 0 0 0 0 0 0 A 1.51.03.3831 Purley Local - Replace T1 and T2 110 741 35 0 0 0 0 0 0 0 0 0 A 1.51.03.7873 Addington Local - Replace Primary Transformers (T1, 0 0 0 0 0 0 0 0 172 1,026 0 0 T2) A 1.51.03.7884 East Croydon 33/6.6kV - Replace Primary Transformer 0 0 0 0 0 0 0 0 0 0 101 1,301 (T1, T2) A 1.51.03.7915 West Wickham 33/11kV - Replace Primary 0 0 0 0 0 0 101 556 556 0 0 0 Transformer (T1 LRE, T2 NLRE) A 1.51.11.7905 Shirley 33/11kV - Refurbish Primary Transformer (T1) 0 0 0 0 0 76 75 0 0 0 0 0

A 1.51.11.8434 Sutton Grid 132kV - Refurbish Grid Transformer (GT2) 0 0 0 89 0 0 0 0 0 0 0 0

R 1.33.01.3190 Coulsdon 33/11kV Primary - Reinforcement 14 1,604 1,625 819 0 0 0 0 0 0 0 0 R 1.33.01.3351 Sutton B 33/11kV Reinforcement - Replace T3/T4 with 0 0 0 0 0 0 0 0 0 0 25 213 20/40 MVA units & add 0.3 km of UGC circuit from Sutton Grid R 1.33.01.8059 St Helier 33kV/11kV Reinforcement - Replace T1/T2 0 0 0 50 371 883 883 1,345 0 0 0 0 with 20/40 MVA, install 3rd 3 km UGC circuit & replace 11 panel SWB R 1.33.03.8339 Sutton A 33/11kV Reinforcement: Replacement of 0 0 0 21 123 245 245 346 0 0 0 0 11kV switchboard due to fault level R 1.35.01.3627 Addington Grid 132/33 kV Reinforcement: Transfer of 0 0 0 0 0 0 418 1,472 1,054 0 0 0 Addington Local to Ashburton Grid R 1.35.05.5631 Croydon 'B': Modified Running arrangement for 2 7 0 0 0 0 0 0 0 0 0 0 Croydon 'B' and Croydon Grid R 1.37.07.3236 Norbury Primary - Transfer Load to Croydon B 0 0 246 1,322 567 0 0 0 0 0 0 0 R 1.37.07.8445 Beddington 132/33kV transformer tails reinforcement 0 0 0 0 0 0 0 0 112 337 0 0

R 1.37.07.8517 Purley Grid: 33kV Interconnection to Addington 0 0 0 901 3,149 0 0 0 0 0 0 0 H 1.29.01.7965 Purley Grid-West Croydon 33/11 (Circuit 2-A-C & 2-C- 0 0 0 0 0 0 0 0 0 0 0 280 F) - 33kV FFC replacement H 1.29.01.7970 Beddington Local 33kV-Sutton Grid 33kV (Circuit 1-E-J 0 0 0 0 0 1,719 0 0 0 0 0 0 & Circuit 2-E-J) - 33kV FFC replacement H 1.29.02.7972 Beddington-Addington Grid (Circuit 1-A-B-P3,Circuit 1- 0 0 0 0 0 1,387 5,549 4,162 0 0 0 0 D-E-P2,Circuit 1-E-F-P1, Circuit 2-DE1-P3,Circuit 1-B- D-P3,Circuit 1-B-D-P2) - 132kV Fluid filled cable replacement

Table 16 above illustrates the full list of Beddington RDP projects identified in the current NAMP for implementation during DPCR5 and ED1 periods. The total budget cost for these project amount to £ 45,633.35k.

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Beddington

5.4 HI / LI Improvement Table 17. – LI Table (With Investment) 2023 Load Index Voltage Substation Without With kV Investment Investment

Beddington

2.00 1.00 Addington Grid 132/11

1.00 1.00 Addington Grid 33/11 33/11 2.00 2.00 Addington Local 33/11

Ashburton Grid 132/33 1.00 1.00 Beddington 132/33 132/33 1.00 1.00 Beddington Local 132/11 1.00 1.00 Bensham Grove 33/6.6 1.00 1.00 Biggin Hill 33/11 1.00 1.00

Bridges Lane 33/11 1.00 1.00

Caterham 33/11 3.00 4.00 Coulsdon 33/11 2.00 2.00 Croydon A 6.6kV 33/6.6 2.00 2.00 Croydon B 132/33 5.00 5.00 Croydon Central 33/11 4.00 4.00

Croydon Grid 132/33 1.00 1.00

Croydon Grid 11kV 33/11 1.00 1.00 East Croydon 33/6.6 1.00 1.00 Norbury 441 33/6.6 2.00 2.00 Nork 33/11 1.00 1.00 2.00 2.00 North Cheam 33/11 Purley Grid 132/33 3.00 3.00

Purley Local 33/11 1.00 1.00 Selhurst 33/6.6 1.00 1.00 Selsdon 33/11 1.00 1.00 Shirley 33/11 1.00 1.00 1.00 1.00 Spurgeons Bridge 33/6.6 St Helier 33/11 5.00 1.00

Suffolk Road 973 33/6.6 1.00 1.00 Sutton A 33/11 1.00 1.00 Sutton B 33/11 5.00 5.00 Sutton Grid 132/33 2.00 1.00 West Croydon 33/11 1.00 1.00 West Wickham 33/11 2.00 2.00

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Beddington Table 17 above provides load indices for each substation covered in this RDP. Sutton B and Croydon B are the only sites on LI5 after investment. East Croydon primary is projected to be in LI5 during ED1 without any intervention but the site will change to LI1 once the proposed ITC project is completed. Load indices for St Helier and Addington Grid are expected to improve from the current position once the works proposed in this RDP are implemented . Table 18. ED1 Health Indices (Circuit Breakers)

2015 2023 with Intervention No. No. No. No. No. No. No. No. Substation No. HI4 No. HI5 HI1 HI2 HI3 HI4 HI5 HI1 HI2 HI3 ADDINGTON GRID 11KV 9 1 10

ADDINGTON LOCAL 4 12 1 17

BEDDINGTON 132/11KV 17 17

BENSHAM GROVE 6.6KV 15 15

BIGGIN HILL 33KV 5 5 10

BRIDGES LANE 11KV 2 11 2 11

CATERHAM 33/11KV 12 12

COULSDON 33/11KV 12 3 15

CROYDON A 6.6KV 36 36

CROYDON CENTRAL 33/11KV 13 13

CROYDON GRID 33/11KV 12 3 2 12 1

EAST CROYDON 33/6.6 KV 18 18

NORBURY 33/6.6KV 16 2 18

NORK 33/11KV 12 12

NORTH CHEAM 33/11KV 13 13

PROLOGIS 132/11KV 10 10

PROLOGIS 132KV 2 2

PURLEY 11KV 20 20

SELHURST 33/6.6 KV 10 5 5

SELSDON 33/11 KV 6 4 1 9

SHIRLEY 33/11kV 1 9 2 1 11

SPURGEONS BRIDGE 6 12 18

ST HELIER 33/11KV 11 11

SUFFOLK ROAD 6.6KV 2 14 2 14

SUTTON A 33/11KV 14 14

SUTTON B 33/11KV 12 12

WEST CROYDON 33/11KV 14 14

WEST WICKHAM 33/11KV 4 7 7 4

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2015 2023 with Intervention No. No. No. No. No. No. No. No. Substation No. HI3 No. HI5 HI1 HI2 HI4 HI5 HI1 HI2 HI3 HI4 ADDINGTON GRID 132 KV 3.00 3.00

ADDINGTON GRID 33 KV 12.00 12.00

ASHBURTON GRID 132 KV 2.00 2.00

ASHBURTON GRID 33 KV 11.00 5.00 6.00

BEDDINGTON 132/33KV 9.00 9.00

CROYDON B 132 KV 2.00 2.00 2.00 2.00

CROYDON B 33KV 9.00 1.00 9.00 1.00

CROYDON GRID 132 KV 2.00 2.00

CROYDON GRID 33KV 13.00 4.00 9.00

PURLEY GRID 6.00 5.00 2.00 8.00 1.00

PURLEY GRID 132 KV 2.00 2.00

SUTTON GRID 132 KV 2.00 2.00

SUTTON GRID 33KV 11.00 11.00

2015 2023 with Intervention No. No. No. No. No. No. No. No. No. No. Substation HI1 HI2 HI3 HI4 HI5 HI1 HI2 HI3 HI4 HI5 BEDDINGTON 22 2 20 CROYDON ENERGY 132KV SWITCHING 1 1 STATION CROYDON GRID 132 KV 1 1

Table 18 above illustrates NLRE projects identified in the current NAMP and the respective equipment health indices after intervention. Several sites have more than one NAMP number associated with them, which provides an opportunity for collaboration and optimisation to manage costs.

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Beddington Table 19. – ED1 Health Indices (Transformers)

2015 2023 with Intervention No. No. No. No. No. No. No. No. Substation No. HI4 No. HI5 HI1 HI2 HI3 HI4 HI5 HI1 HI2 HI3 ADDINGTON GRID 11KV 2 2 ADDINGTON LOCAL 1 1 2

BENSHAM GROVE 6.6KV 2 2 BIGGIN HILL 33KV 2 2 CATERHAM 33/11KV 2 2 COULSDON 33/11KV 1 1 1 1 CROYDON A 6.6KV 2 1 1 CROYDON B 132 KV 1 1 CROYDON CENTRAL 33/11KV 2 2 CROYDON GRID 33/11KV 2 2 EAST CROYDON 33/6.6 KV 2 2 NORBURY 33/6.6KV 2 2

NORK 33/11KV 2 1 1 NORTH CHEAM 33/11KV 2 2 PURLEY 11KV 2 1 3 SELHURST 33/6.6 KV 2 1 1 SELSDON 33/11 kV 2 2 SHIRLEY 33/11KV 1 1 1 1 SPURGEONS BRIDGE 2 2 ST HELIER 33/11KV 2 2

SUFFOLK ROAD 6.6KV 2 2 SUTTON A 33/11KV 2 2 SUTTON B 33/11KV 2 2

WEST CROYDON 33/11KV 2 2 WEST WICKHAM 33/11KV 1 1 2

2015 2023 with Intervention No. No. No. No. No. No. No. No. Substation No. HI4 No. HI5 HI1 HI2 HI3 HI4 HI5 HI1 HI2 HI3 ADDINGTON GRID 132 KV 3 3 ASHBURTON GRID 132 KV 2 2 BEDDINGTON 2 2 BEDDINGTON 132KV CROYDON B 132 KV 1 1 1

CROYDON GRID 132 KV 2 1 1 PROLOGIS 132KV 1 1 1 1 PURLEY GRID 132 KV 2 2 SUTTON GRID 132 KV 1 1 1 1

Table 19 above illustrates that transformers at Addington Local will be replaced to become HI1 during ED1 period. However the switchgear at the same site is also earmarked for replacement due to poor asset health condition under project 3256, which provides an opportunity for project optimisation as the site is also due for an ITC due to firm capacity violation under project 7873.

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Beddington Table 20. – ED1 Health Indices (Overhead Lines) Section Voltage (LC) (LF) (RC) (RF) (EC) (EF) (TSW) (F) OFGEM Intervention (Route) OFGEM OFGEM OFGEM OFGEM OFGEM OFGEM OFGEM HI 2023 Project HI 2024 HI 2024 HI 2024 HI 2024 HI 2024 HI 2024 HI 2023 Number PL 132 2 3 2 3 2 3 5 2 Croydon Grid PL 132 2 3 2 3 2 3 5 2 Croydon Grid PL 132 2 3 2 3 2 3 5 3 Croydon Grid PL 132 2 3 2 3 2 3 5 3 Croydon Grid PL 132 2 3 2 3 2 3 5 NO RESULT Croydon Grid PL 132 2 5 2 3 2 3 5 NO RESULT Croydon Grid PL 132 2 3 2 3 2 3 5 2 Croydon Grid PL 132 2 3 2 3 2 3 5 2 Croydon Grid PL 132 2 3 2 3 2 3 5 NO RESULT Addington PQ 132 2 3 2 3 2 3 5 4 Addington PQ 132 2 3 2 3 2 3 5 4 Addington PQ 132 2 3 2 3 2 3 5 4 Addington PQ 132 2 3 2 3 2 3 5 4 Addington PQ 132 2 3 2 3 2 3 5 4 Addington PQ 132 2 3 2 3 2 3 5 4 Addington PQ 132 2 3 2 3 2 3 5 4 Addington PQ 132 2 3 2 3 2 3 5 4 Addington PQ 132 2 3 2 3 3 3 5 4 Addington PQ 132 2 3 2 3 3 3 5 2 Croydon B PQB 132 2 3 2 3 2 3 5 3 Croydon B PQB 132 2 3 2 3 2 3 5 2 Croydon B PQB 132 2 3 2 3 2 3 5 2 Croydon B PQB 132 2 3 2 3 2 3 5 3

Table 20 above illustrates that all tower structures will be in HI5 during ED1 period, however this is due poor paint condition. All tower structures will require painting during this period.

Table 21 below provides projected health indices for various underground cable circuits covered in this RDP during ED1 period. Interventions to improve poor health indices are discussed above.

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Beddington

Table 21. – ED1 Health Indices (Underground Cables)

Corporate Asset ID Section (Route) Cable Section Voltage OFGEM HI in 2024

Beddington000002064610 132kV BEDDINGTON LOCAL 33-SUTTON GRID 33 CABLE SECTION: 91039147-1-E-J 33 5 Beddington000002064612 132kV BEDDINGTON LOCAL 33-SUTTON GRID 33 CABLE SECTION: 91039147-2-E-J 33 4 Beddington000002064576 132kV BEDDINGTON MAIN-ADDINGTON GRID 132 CABLE SECTION: 90AA9901-2-1B 132 5 Beddington000002065058 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-A-B-P3 132 5 Beddington000002065072 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-D-E-P2 132 5 Beddington000002065067 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-E-F-P1 132 5 Beddington000002065078 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-DE1-P3 132 5 Beddington000002065071 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-B-D-P2 132 5 Beddington000002065059 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-B-D-P3 132 5 Beddington000002065109 132kV BEDDINGTON-ASHBURTON GRID 132 CABLE SECTION: 99039979-2-A-B 132 4 Beddington000002064850 132kV PURLEY GRID-WEST CROYDON 33/11 CABLE SECTION: 91418509-2-A-C 33 5 Beddington000002064851 132kV PURLEY GRID-WEST CROYDON 33/11 CABLE SECTION: 91418509-2-C-F 33 5 Beddington000002064599 132kV ADDINGTON GRID 33-WEST WICKHAM 33/11 CABLE SECTION: 91018513-1-A-B 33 3 Beddington000002064604 132kV BEDDINGTON LOCAL 33-EAST CROYDON 33/6.6CABLE SECTION: 91038395-1-3 33 3 Beddington000002064606 132kV BEDDINGTON LOCAL 33-EAST CROYDON 33/6.6CABLE SECTION: 91038395-2-2 33 3 Beddington000002064577 132kV BEDDINGTON MAIN-ADDINGTON GRID 132 CABLE SECTION: 90AA9901-2-1R 132 3 Beddington000002065063 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-A1A-P1 132 3 Beddington000002065069 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-A1A-P2 132 3 Beddington000002065057 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-A1A-P3 132 3 Beddington000002065064 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-A-B-P1 132 3 Beddington000002065070 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-A-B-P2 132 3 Beddington000002065065 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-B-D-P1 132 3 Beddington000002065066 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-D-E-P1 132 3 Beddington000002065060 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-D-E-P3 132 3 Beddington000002065073 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-E-F-P2 132 3 Beddington000002065061 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-E-F-P3 132 3 Beddington000002065068 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-F-G-P1 132 3 Beddington000002065074 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-F-G-P2 132 3 Beddington000002065062 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-1-F-G-P3 132 3 Beddington000002065082 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-A1A-P1 132 3 Beddington000002065089 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-A1A-P2 132 3 Beddington000002065075 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-A1A-P3 132 3 Beddington000002065083 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-A-B-P1 132 3 Beddington000002065090 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-A-B-P2 132 3 Beddington000002065076 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-A-B-P3 132 3 Beddington000002065084 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-B-D-P1 132 3 Beddington000002065077 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-B-D-P3 132 3 Beddington000002065085 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-DE1-P1 132 3 Beddington000002065092 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-DE1-P2 132 3 Beddington000002065079 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-E1E-P3 132 3 Beddington000002065087 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-E-F-P1 132 3 Beddington000002065080 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-E-F-P3 132 3 Beddington000002065088 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-F-G-P1 132 3 Beddington000002065081 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-F-G-P3 132 3 Beddington000002065107 132kV BEDDINGTON-ASHBURTON GRID 132 CABLE SECTION: 99039979-1-A-B 132 3 Beddington000002065103 132kV BEDDINGTON-SUTTON GRID 132 CABLE SECTION: 99039947-1-A-B 132 3 Beddington000002064848 132kV PURLEY GRID-WEST CROYDON 33/11 CABLE SECTION: 91418509-1-A-C 33 3 Beddington000002064849 132kV PURLEY GRID-WEST CROYDON 33/11 CABLE SECTION: 91418509-1-C-F 33 3 Beddington000002064867 132kV SUTTON GRID 33-ST HELIER 33/11 CABLE SECTION: 91478477-2-2 33 3 Beddington000002064601 132kV ADDINGTON GRID 33-WEST WICKHAM 33/11 CABLE SECTION: 91018513-2-A-B 33 3 Beddington000002064603 132kV BEDDINGTON LOCAL 33-EAST CROYDON 33/6.6CABLE SECTION: 91038395-1-2 33 3 Beddington000002064607 132kV BEDDINGTON LOCAL 33-EAST CROYDON 33/6.6CABLE SECTION: 91038395-2-3 33 3 Beddington000002064578 132kV BEDDINGTON MAIN-ADDINGTON GRID 132 CABLE SECTION: 90AA9901-2-1Y 132 3 Beddington000002065097 132kV BEDDINGTON-ADDINGTON GRID 132 CABLE SECTION: 99039901-1-1-P1 132 3 Beddington000002065098 132kV BEDDINGTON-ADDINGTON GRID 132 CABLE SECTION: 99039901-1-1-P2 132 3 Beddington000002065096 132kV BEDDINGTON-ADDINGTON GRID 132 CABLE SECTION: 99039901-1-1-P3 132 3 Beddington000002065091 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-B-D-P2 132 3 Beddington000002065086 132kV BEDDINGTON-ADDINGTON GRID PQ1 CABLE SECTION: 990390AB-2-E1E-P1 132 3

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Beddington 5. Alternatives considered

The following projects are identified in the current NAMP but have been rejected in this RDP for reasons stated below.

5.1 Alternative Strategy 1 7929 - St Helier 33/11kV - Retrofit 11kV Switchgear - £175k (2021-2022)

The condition assessment of the 1965 Reyrolle LMT oil switchgear installed at ST HELIER 33/11kV has shown that the probability of failure due to degradation will become unacceptable with HI3/8 during ED1 period. It is not possible to keep these assets in use without compromising operational requirements, therefore this project recommends its Refurbishment. Completion of the project will see 11 circuit breakers refurbished

The option to refurbish the 11kV switchgear is rejected because the site is also due for an ITC from 2x16/20MVA to 2x20/40MVA, which requires switchgear uprating to match the new transformer ratings.

5.2 Alternative Strategy 2 8062 - Sutton Grid 33kV Reinforcement - £6,892 (2017-2020) The predicted load at Sutton Grid 33kV will exceed the existing rating of the associated transformer circuits. It is not possible to lower the load without compromising operational and planning requirements. It is therefore proposed to increase transformer circuit capacity by replacing the 15 panel 33kV switchboard and replacing 7 km of 132kV underground cable from Beddington. Completion of this project will see the transformer feeder circuit uprated by replacement of 15 panels of 33kV switchboard and addition of a new Beddington-Sutton Grid 132kV cable circuits while the existing 132kV FFC are to be banked on T2. This strategy is rejected because of the extra capacity created by the ITC at Beddington 132/33kV and possibility of transferring St Helier primary load from Sutton Grid to Beddington Grid in order to improve firm capacity at Sutton Grid. 7. References

References Description

Reference 1 Planning Load Estimates SPN Area 2011 – 2023 (20 August 2012) Reference 2 SPN 132kV System Diagram East Reference 3 SPN 132kV System Diagram West Reference 4 SPN LTDS Network Schematics Reference 5 DPCR5 NAMP v 6.8 Reference 6 ED1 NAMP v10.3.1

7.1 Appendices

Appendix Description

Appendix A Geographical diagram Appendix B Single Line Diagram – Existing Network Appendix C Single Line Diagram – Recommended Strategy

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Beddington 7.2 Document History

Version Date of Issue Author Details 1 06/10/2012 Itayi Utah Draft for approval

8. Document sign off Sign-off of this Mandate certifies that the Sponsor has ratified the above and approval is sought to proceed to the development of the necessary PG&C Gate B documentation.

Recommended by: Name Role Signature Date

Itayi Utah Infrastructure Planning Engineer

Tendai Matiringe IDP Coordinator (SPN)

Chris Winch Planning Manager ( South)

Approval by: Name Role Signature Date

Robert Kemp Head of System Development Robert Kemp

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Beddington RDP APPENDIX A: GEO-PHYSICAL NETWORK DIAGRAM

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Beddington RDP APPENDIX B: SINGLE LINE DIAGRAM – EXISTING NETWORK (132KV)

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Beddington RDP

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Regional Development Plan

Beddington RDP APPENDIX C: SINGLE LINE DIAGRAM – RECOMMENDED STRATEGY

009103 G1 09 10 G2 09 61 10 GT1 BEDDINGTON 30MVA 009378 GT2 61 G1 G2 05 07 06 08 PROLOGIS 30MVA 132/11KV G3 G4 GT1 GT2 009179 13 15 61 14 16 90MVA 90MVA ASHBURTON GT3 60MVA G1A1 G2A1 009303 12 13 74 05 06 BEDDINGTON 79 78 77 76 75 11kV 009113 73 GT4 61 CROYDON 007306 60MVA 009115 80 81 82 83 84 G1 G2 BRIDGES LANE GRID 05 G1A2 G2A2 CROYDON B 11kV 62 60 R2 45MVA

G2 G1 GT2 213 GT1A GT2A 45MVA 30+30 30+30 GT2 GT1 MVA MVA 61 90MVA 90MVA 213A 224 124 009938 CROYDON G1A G1B

190 CROYDON ENERGY LTD ENERGY 009338 193 SW.STN (C.E.L.) BAT01 MKA01 194 196 CROYDON B GT1 195 (NEW) 009115 60/ 90MVA

113

1303 1103 703 113 203 213 413 1403 1003

310 1305 1105 705 110 205 210 410 1405 1005

124 120 128 314 1304 1104 134 384B 704 304 904 284B 114 504 104 604 204 184B 214 414 484B 404 234 1404 1004 1204 804

130 230

316 1306 1106 136 386B 706 306 906 286B 116 506 106 606 206 186B 216 416 486B 406 236 1406 1006 1206 806

166 160 169 380B 305 905 280B 505 105 605 180B 480B 405 1205 805 009903 383B 303 903 283B 503 103 BEDDINGTON 603 183B 483B 403 1203 803

GT1 GT2 90MVA 90MVA

G2 61 G1 GT1 GT2 125 225 90MVA 90MVA 009147 113 213 G1 60 G2 SUTTON GT1 GT3 GT2 60MVA 30MVA 60MVA 62

009141 G1 61 G3 G2

PURLEY 62 009101 ADDINGTON

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Beddington RDP

T2 16/20 008652 52 MVA SELHURST 51 60 T1 33/6.6kV 16/20 MVA 60 T1 52 51 60 16/20 53 52 MVA T2 T2 T1 16/20 11.5/23 11.5/23 MVA MVA MVA 008372 51 SPURGEONS Tram/NWR Line 008441 BRIDGE NORBURY BR 3049 Trafalgar Way 33/6.6kV 33/6.6kV GT2 GT1 90MVA 90MVA 008608 Purley Way 009179 CROYDON GRID 10 G2 04 03 G1 07 33/11kV ASHBURTON GRID 60 008358 61 BENSHAM GROVE 08 06 02 01 05 09 132/33kV 52 51 33/6.6kV

T2 T1 T2 19/38 19/38 12/24 BR 565 MVA MVA 51 MVA To 009101 61 009115 Addington T1 Grid 12/24 CROYDON ‘B’ GT2 GT1 52 MVA (NEW) T2 T1 90MVA 90MVA 16/20 16/20 132/33kV MVA MVA

06 08 G2 09 04 03 G1 07 52 51 61 09N 07N 06N 08N 62 61 61 008605 62 60 CROYDON 10 02 01 11 05 11N G1A 13N 12N G1B 10N 51 52 008484 CENTRAL 009113 33/11kV SHIRLEY CROYDON 33/11kV T1 T2 GRID BR 538 BR 539 20/40 20/40 132/33kV MVA MVA GT1 60/90MVA (NEW)

T1 T2 20/40 30MVA GT2 MVA 45MVA R3 20 45 R2 T2 T1 12/24 12/24 MVA MVA R2A R2B R1B R1A G1 53 09 08 G2 52 51 61 62 06 20

05 54 52 53 51 R1 61 009915 10 12 07 11 13 008373 SUFFOLK ROAD 62 CROYDON ‘B’ 132/33kV 33/6.6kV R2 60 20

008314 BR 539 BR 538 CROYDON ‘A’ 33/6.6kV

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Beddington RDP

008652 SELHURST 33/6.6kV

60 52 51

T2 T1 11.5/23 11.5/23 MVA MVA

GT2 GT1 90MVA 90MVA

10 G2 04 03 G1 07 009179 ASHBURTON 61 GRID 08 06 02 01 05 09 132/33kV

T2 T1 16/20 16/20 MVA MVA

52 51 61

62 008513 008484 WEST WICKHAM SHIRLEY 33/11kV T2 33/11kV 20/40 MVA 52

T1 61 20/40 MVA 51 008301 ADDINGTON LOCAL 33/11kV

62 61

52 51

T2 T1 16/20 16/20 MVA MVA

14 08 06 05 07 13

009101 62 61 ADDINGTON GRID 132/33kV

G3 12 G2 10 09 G1 11

GT3 GT2 GT1 30MVA 60MVA 60MVA

T2 T1 15.3 15.3 MVA MVA 008481 SELSDON 52 51 60 33/11kV T2 008609 16/20 52 MVA ADDINGTON GRID 33/11kV 61 51

T1 16/20 MVA T2 T1 16/20 16/20 MVA MVA

52 51 61

008322 BIGGIN HILL 33/11kV

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Beddington RDP APPENDIX D CROYDON BOROUGH OF LONDON’S FIVE MASTER PLANS

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