Octopus Energy Trading Limited
Sells into the markets for 7 units at 7 sites, 272 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 4 of the 7; the other 3 are auction registrations, where the name is NESO's and unchecked.
The book
| Balancing mechanism, paid to discharge | £1.1m |
| Balancing mechanism, paid out to charge | −£2.0m |
| Response and reserve auctions | £454k |
| Capacity market | £2.6m |
| Income across the book, per kilowatt | £15.28/kW/yr fleet 42.17 |
| Median unit, all three lines | £14.64/kW/yr |
| Hours at full power, sent out | 58 h/yr |
| Hours at full power, taken in | 393 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 one owner behind it is established from control filings, on the owner pages. A battery that re-registered under a new code is counted once.
| Owner | Batteries | MW |
|---|---|---|
| Gresham House Energy Storage Fund | 7 | 272 |
Every unit it sells for
| Unit | MW | Balancing | Standing ready | CM | £/kW/yr |
|---|---|---|---|---|---|
| West Didsbury North Midlands and North Wales | 45 | — | £24k | £633k | 14.64 |
| AR0006-BLOX Mid Wales and The Midlands | 42 | £744k | £134k | £93k | 23.33 |
| Coupar Battery Storage Eastern Grampian and Tayside | 41 | £85k | £88k | £318k | 11.92 |
| Shilton Lane BESS South West Scotland | 40 | £198k | £43k | — | 6.04 |
| Stairfoot North Midlands and North Wales | 40 | — | £71k | £329k | 10.01 |
| Arbroath Battery Storage Eastern Grampian and Tayside | 34 | £90k | £75k | £362k | 15.32 |
| West Bradford South Lancashire, Yorkshire and Humber | 29 | — | £20k | £831k | 29.42 |
Registrations that moved to another seller
Octopus Energy Trading 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 |
|---|---|---|---|---|
| Byers Brae (BYBRB-1) BYBRB-1 | 26 | 19 August 2026 | EDF Energy Limited as EDF01N | £111k |
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 |
|---|---|---|
| West Didsbury (Statera) Arenko sold the predecessor code until September 2024 | 45 | Octopus Energy, route to market, from 2026 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.