Regional Development Plan
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Title: Northfleet SPN Regional Development Plan Author: URS / C Winch Version: 1.5 Date: June 2013 UK Power Networks (Operations) Limited. Page 1 of 36 Registered in England and Wales. Regional Development Plan Northfleet Contents 1 EXECUTIVE SUMMARY .................................................................................................................................. 4 2 NETWORK CONFIGURATION .......................................................................................................................... 9 2.1 EXISTING NETWORK .......................................................................................................................................... 9 2.2 EMBEDDED GENERATION (G59/2) .................................................................................................................... 11 2.3 NETWORK CHANGES IN PROGRESS ..................................................................................................................... 11 3 SUMMARY OF ISSUES .................................................................................. ERROR! BOOKMARK NOT DEFINED. 3.1 DISTRICT / LOCAL DEVELOPMENT PLANS .............................................................................................................. 13 3.2 PARAMOUNT PICTURES THEME PARK EBBSFLEET .................................................................................................... 14 3.3 SECURITY OF SUPPLY ANALYSIS AND LI PROFILE ..................................................................................................... 17 3.4 ASSET REPLACEMENT ............................................................................................... ERROR! BOOKMARK NOT DEFINED. 3.5 OPERATIONAL AND TECHNICAL CONSTRAINTS ......................................................................................................... 20 3.6 NATIONAL GRID ............................................................................................................................................. 20 3.7 PINCH POINTS ....................................................................................................... ERROR! BOOKMARK NOT DEFINED. 4 RECOMMENDED STRATEGY ......................................................................................................................... 21 4.1 REINFORCEMENT ............................................................................................................................................ 23 4.2 ASSET REPLACEMENT ...................................................................................................................................... 23 4.2.1 Switchgear ............................................................................................... Error! Bookmark not defined. 4.2.2 Transformers ............................................................................................ Error! Bookmark not defined. 4.2.3 Circuits ..................................................................................................... Error! Bookmark not defined. 4.3 COSTS AND PHASING ...................................................................................................................................... 25 4.4 HI / LI PROFILE POST INTERVENTION ................................................................................................................... 27 5 REJECTED OPTIONS ...................................................................................... ERROR! BOOKMARK NOT DEFINED. 5.1 EBBSFLEET: NEW PRIMARY SUBSTATION .............................................................................................................. 30 6 REFERENCES ............................................................................................................................................. 31 6.1 APPENDICES ................................................................................................................................................. 31 6.2 DOCUMENT HISTORY ...................................................................................................................................... 31 7 DOCUMENT SIGN OFF ................................................................................................................................. 32 Regional Development Plan Template v1.1 Page 2 of 36 Regional Development Plan Northfleet Regional Development Plan Template v1.1 Page 3 of 36 Regional Development Plan Northfleet 1 Executive Summary This Regional Development Plan (RDP) reviews the EHV network supplied from Northfleet Super Grid Supply Point (GSP). The network is complex with 132kV interconnection to four adjacent GSP’s at Littlebrook, Kingsnorth (via Burham & Medway) Bolney (via Dormansland) and Ninfield (via Pembury, Harley & Hastings) with 33kV interconnection to Hurst (via Orpington), Ninfield (via Paddock Wood) and Kingsnorth (via Burham). Group demand is 475MW which is forecast to decrease to 466MW by 2023 (Element Energy). The decrease is attributable to decommissioning of Sharnal Street Primary where 3MW of load has been transferred to Kingsnorth GSP and the decommissioning of APCM Cement Works block load of 7MW following the installation of a cement importation terminal and 'bagging plant' (7MW). The APCM 132/11kV substation was dismantled during the period under review after cement production ceased. The area encompasses a diverse range of residential, mixed industrial and brown field areas ranging from prosperous areas like Tunbridge Wells in the south through to suburban Bromley and Orpington and the post- industrial Thames riverside towns of Northfleet and Gravesend. High profile developments supplied from Northfleet East include the Blue Water Shopping centre and Ebbsfleet International train station. Future major developments are expected to be clustered along the Thames corridor and include the proposed Paramount Pictures theme park. Local development plans show that there is a significant increase in new homes for parts of Gravesham and Dartford Districts which lie within the Thames Gateway Development Zone. Northfleet Supply Area Reinforcement is proposed at 3 existing substations to ensure continued adherence to Engineering Recommendation P2/6 together with management of load index (LI) profile. In addition, developments in the Estuary area may trigger the requirement for a new main substation at Ebbsfleet. Proposed asset replacements are designed to ensure reliable and secure network performance. With the exception of Ebbsfleet, adopting this approach results in no major network reconfigurations with proposed works contained within the boundary of the existing network and substation sites. Regional Development Plan Template v1.1 Page 4 of 36 Regional Development Plan Northfleet Proposed Projects >£1M Reinforcement Gravesend Town 33/6.6kV Reinforcement £4.M Sundridge 33/11kV ITC £1.3M Asset Replacement Sundridge 11kV Switchboard Replacement £1.0M South Orpington 11kV Switchboard Replacement £1.0M Costs Profile 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 /2014 /2015 /2016 /2017 /2018 /2019 /2020 /2021 /2022 /2023 R TOTAL ASSET REPLACEMENT 726.08 1151.4 3756.3 2205.9 69.682 604.61 1022.9 556.95 1676.2 1409.6 A TOTAL REINFORCEMENT 4197.4 4157.9 1263.8 0 289.6 919.87 202.45 233.64 343.06 343.06 Output Measures Load Index The forecast load indices for 2023, with and without intervention, are detailed below. Regional Development Plan Template v1.1 Page 5 of 36 Regional Development Plan Northfleet Output Measures Health Index The forecast health indices for 2023, with and without intervention, for each plant category are detailed below. HV Circuit breakers 250.00 200.00 150.00 2015 2023 100.00 2023 with 50.00 Intervention 0.00 1 2 3 4 5 33kV Circuit breakers 60 50 2015 40 2023 30 2023 with 20 Intervention 10 0 1 2 3 4 5 Regional Development Plan Template v1.1 Page 6 of 36 Regional Development Plan Northfleet 132kV Circuit Breakers 20 18 16 14 12 2015 10 2023 8 2023 with 6 Intervention 4 2 0 1 2 3 4 5 Primary Transformers 45 40 35 30 2015 25 2023 20 2023 with 15 Intervention 10 5 0 1 2 3 4 5 Regional Development Plan Template v1.1 Page 7 of 36 Regional Development Plan Grid Transformers Northfleet 12 10 8 2015 2023 6 2023 with Intervention 4 2 0 1 2 3 4 5 Principle Risks and Dependencies The schemes covered in this RDP have been planned based on the planning load estimates 2013 with the 2011/12 maximum demand. The load forecasts are based on the element energy model. If the economic situation improves there is a risk that there will be shortfall of reinforcement schemes in the plan. The load forecasts also include an assumed level of embedded generation being connected to the network. Should this generation not materialise, 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. Regional Development Plan Template v1.1 Page 8 of 36 Regional Development Plan Northfleet 2 Network Configuration 2.1 Existing Network The Northfleet network shown in Figure 1 is complex. It is supplied by 4x 240MVA 400/132kV SGT’s at Northfleet East substation with 132kV interconnection to four adjacent grid substations at Littlebrook, Kingsnorth (via Burham & Medway) Bolney (via Dormansland) and Ninfield (via Pembury,