EDF Energy Customers Limited
Sells into the markets for 25 units at 24 sites, 844 MW together, over the 364 days to 27 September 2026. Everything here is measured from published settlement and auction results; wholesale trading is invisible for every optimiser, not just this one. Elexon's balancing mechanism register names it on 15 of the 25; the other 10 are auction registrations, where the name is NESO's and unchecked.
The book
| Balancing mechanism, paid to discharge | £10.4m |
| Balancing mechanism, paid out to charge | −£7.1m |
| Response and reserve auctions | £19.8m |
| Capacity market | £4.9m |
| Income across the book, per kilowatt | £41.77/kW/yr fleet 42.17 |
| Median unit, all three lines | £32.73/kW/yr |
| Hours at full power, sent out | 142 h/yr |
| Hours at full power, taken in | 151 h/yr |
What the book is made of
Performance follows portfolio shape as much as skill: a Scottish, long duration book does a different job from an English one hour book, so the mix belongs beside the money, not in a footnote.
Duration, by megawatt
Region, by megawatt
Whose batteries it sells
None of the book is its own. The 8 owners behind it are established from control filings, on the owner pages. A battery that re-registered under a new code is counted once.
| Owner | Batteries | MW |
|---|---|---|
| Voltwise Power (Sandbrook Capital) | 10 | 446 |
| Cero Generation and Enso Energy joint venture | 1 | 57 |
| Cero Generation (Macquarie Green Investment Group) | 1 | 52 |
| Zenobe Energy | 3 | 50 |
| Downing | 1 | 48 |
| Pivot Power (EDF Renewables UK) | 1 | 46 |
| Eku Energy | 1 | 36 |
| Gridserve | 2 | 9 |
| owner not yet established | 5 | 100 |
Every unit it sells for
| Unit | MW | Balancing | Standing ready | CM | £/kW/yr |
|---|---|---|---|---|---|
| Bulphan Fen Warley Green BESS Essex and Kent | 57 | £1.8m | −£182k | £272k | 34.30 |
| Wolverhampton West BESS Mid Wales and The Midlands | 56 | £1.1m | £499k | £269k | 32.73 |
| Larks Green Battery Storage Cotswold | 52 | £3.3m | £413k | £373k | 78.16 |
| Newton wood BESS North Midlands and North Wales | 52 | £699k | £1.4m | £375k | 47.13 |
| Brook Farm BESS Mid Wales and The Midlands | 52 | £681k | £1.2m | £373k | 43.37 |
| Burwell 1 Mid Wales and The Midlands | 52 | £407k | £1.1m | £373k | 36.83 |
| Brentwood BESS Essex and Kent | 52 | £199k | £1.1m | £134k | 27.64 |
| Berkeley BESS Cotswold | 52 | £189k | £1.2m | £375k | 33.66 |
| Nursling Battery Storage Somerset and Wessex | 48 | £468k | £1.3m | £87k | 38.62 |
| Titchfield Lane Somerset and Wessex | 47 | — | £521k | £252k | 16.48 |
| Pivot Power Kemsley Essex and Kent | 46 | £547k | £1.2m | £310k | 44.92 |
| Hunningley Stairfoot BESS North Midlands and North Wales | 44 | £611k | £1.1m | £302k | 46.43 |
| Maldon Essex and Kent | 36 | — | £3.3m | £302k | 101.36 |
| North Tawton BESS West Devon and Cornwall | 32 | £393k | £328k | £163k | 27.72 |
| Aylesford Essex and Kent | 30 | — | £2.4m | £103k | 84.45 |
| Erskine BESS South West Scotland | 30 | £49k | £212k | £345k | 20.33 |
| Birch Essex and Kent | 25 | — | £17k | — | 0.69 |
| East Cambridgeshire Mid Wales and The Midlands | 24 | — | £204k | — | 8.52 |
| Stockport North Midlands and North Wales | 20 | — | £115k | — | 5.74 |
| Zenobe Brindley Cotswold | 12 | — | £1.4m | £181k | 134.29 |
| Hill Farm Mid Wales and The Midlands | 8 | — | £254k | £288k | 57.74 |
| Norwich East Electric Forecourt Mid Wales and The Midlands | 5 | — | £136k | £16k | 30.52 |
| Edfe-1 Mid Wales and The Midlands | 5 | — | £81k | — | 16.20 |
| Gatwick Electric Forecourt Oxfordshire, Surrey and Sussex | 4 | — | £220 | £16k | 4.13 |
| Central Bedfordshire Mid Wales and The Midlands | 3 | — | £25k | — | 8.41 |
2 batteries ran under an earlier registration with this seller for part of the year, E_BRETB-1 until 8 December 2025, E_BERKB-1 until 8 September 2025. The money earned under the earlier code is in the book above; the capacity is counted once.
Registrations that moved to another seller
EDF Energy Customers Limited sold these batteries until the date shown; each has since re-registered under a new code with somebody else. What each earned under this seller in the window is shown here and is not in the book above; the capacity is counted on the page of whoever sells it now.
| Battery | MW | Last ran here | Now sold by | Earned here |
|---|---|---|---|---|
| Buckinghamshire (EDFE-15) EDFE-15 | 40 | before 31 March 2025 | Gore Street Energy Trading Limited as GSET-07 | — |
| Edfe-13 EDFE-13 | 28 | 30 September 2025 | EDF Energy Limited as MANNB-1 | −£2k |
| SUSI Eelpower Rock Farm EDFE-8 | 18 | 1 December 2025 | EDF Energy Limited as RCKFB-1 | £160k |
| Winchester (EDFE-11) EDFE-11 | 9 | 1 December 2025 | EDF Energy Limited as WNCRB-1 | £46k |
What the documents say
The register names who sells; these are the arrangements behind that, from owner and optimiser announcements, each with its kind, because an optimisation agreement, a route to market, a toll, a floor and self-trading are different products with different risk.
| Site | MW | Party and arrangement |
|---|---|---|
| Pivot Power fleet (Cowley, Kemsley, Coventry, Bustleholme, Sundon, Bredbury, Bramford, Indian Queens) Bredbury and Indian Queens sell as Pivoted Power LLP | 404 | EDF (Powershift), route to market and optimisation; EDF is Control Point, from 2021 confirmed source |
| Voltwise fleet (ex SMS): Barnsley, Berkeley, Brentwood, Brook Farm, Burwell, Newtonwood, North Tawton, Wolverhampton, Erskine Arenko sold Berkeley, Brentwood and Burwell I until late 2025 | 350 | EDF, sells the whole fleet; no published agreement found, from 2025 probable source |
| SUSI Eelpower JV: Rock Farm, Winchester, Dunsinane Dunsinane has no visible registration | 78 | EDF, market access and optimisation, from 2023 confirmed source |
Attribution. A unit belongs to whoever the market registers as its seller today, so a book that changed hands mid year credits the whole year to the current seller. The exception is a battery that re-registered under a new code: it is counted once, under the code it runs on today, and where the earlier code sold through somebody else that seller keeps what it earned. We have recorded optimiser switches since 27 August 2026 and the record deepens from here. Corporate families are not joined: a platform selling through several registered entities appears as several rows on the optimiser list.