Gore Street Energy Storage Fund
Owns 10 batteries at 10 sites, 234 MW, which is 3.4 per cent of everything operating in Great Britain. It sells none of that power itself. The register names 3 other companies as the sellers: Gore Street Energy Trading Limited, Flexitricity Limited and EDF Energy Customers Limited.
Who sells its power
The balancing mechanism register names the company allowed to sell each unit's power. That company is usually an optimiser or a supplier working under contract, which is why the registers cannot answer the ownership question on their own. Where the seller is one of the owner's own companies, the row says so.
| Seller | Batteries | MW | Of this fleet |
|---|---|---|---|
| Gore Street Energy Trading Limited | 8 | 145 | 62% |
| Flexitricity Limited | 1 | 49 | 21% |
| EDF Energy Customers Limited | 1 | 40 | 17% |
What it was paid
The three published lines, added up across the fleet for the 364 days to 6 September 2026. Wholesale trading income is invisible for every owner, not just this one, and nothing here nets the cost of charging. The rate is per kilowatt of current capacity.
| Balancing mechanism, paid to discharge | £1k |
| Balancing mechanism, paid out to charge | −£87 |
| Response and reserve auctions | £5.3m |
| Capacity market | £1.2m |
| Income across the fleet, per kilowatt | £27.96/kW/yr fleet 35.48 |
| Median battery, all three lines | £36.28/kW/yr |
| Hours at full power, sent out | 0 h/yr |
| Hours at full power, taken in | 0 h/yr |
What the fleet is made of
Duration, by megawatt
Region, by megawatt
Every battery it owns
| Battery | MW | Sold by | Grade | £/kW/yr |
|---|---|---|---|---|
| Hutton Battery Storage Essex and Kent | 49 | Flexitricity Limited | confirmed | 9.00 |
| Buckinghamshire (GSET-07) Mid Wales and The Midlands | 45 | Gore Street Energy Trading Limited | probable | 32.78 |
| Gses 1 (EDFE-15) Mid Wales and The Midlands | 40 | EDF Energy Customers Limited | confirmed | 11.74 |
| Buckinghamshire (GSET-08) Mid Wales and The Midlands | 27 | Gore Street Energy Trading Limited | probable | 36.28 |
| Gses 1 (GSET-04) North Midlands and North Wales | 18 | Gore Street Energy Trading Limited | confirmed | 44.35 |
| Gses 1 (GSET-05) South Lancashire, Yorkshire and Humber | 18 | Gore Street Energy Trading Limited | confirmed | 40.17 |
| Gses 1 (GSET-03) Mid Wales and The Midlands | 18 | Gore Street Energy Trading Limited | confirmed | 33.68 |
| Breach Farm Mid Wales and The Midlands | 8 | Gore Street Energy Trading Limited | confirmed | 53.38 |
| Gset-01 Essex and Kent | 8 | Gore Street Energy Trading Limited | named | 38.55 |
| Kiwi Es B South Wales & Gloucester | 3 | Gore Street Energy Trading Limited | confirmed | 79.77 |
One battery ran under an earlier registration for part of the year, ANSC-012. The money earned under the earlier code is in the book above; the capacity is counted once.
How we know
Confirmed means a control filing at Companies House, or the owner's own published statement, names the company. Probable means the evidence is strong and indirect. Named means the register leaves the owner blank, the balancing code carries the owner's initials, and a sibling unit at the same site is already settled. Each chain below is printed once, with the batteries it settles.
Confirmed Hutton Battery Storage, Gses 1 (EDFE-15), Gses 1 (GSET-04), Gses 1 (GSET-05), Gses 1 (GSET-03), Breach Farm
GSES 1 Limited is held at three quarters or more by Gore Street Energy Storage Fund Plc, and has been since February 2018. Source
Confirmed Ansc-012 (earlier registration), Kiwi Es B
The capacity market holds a Bridgend site called KPB002, which reads as Kiwi Power Battery, belonging to Gore Street Energy Storage Fund plc 420 metres away. The second unit at the same postcode carries no owner and is read across. Source
Probable Buckinghamshire (GSET-07), Buckinghamshire (GSET-08)
Nidec's EPC case study for Gore Street's 79.9 MW Stony site near Milton Keynes matches the postcode and the two units' combined size. Source
Named Gset-01
The register names no owner. The unit code and the lead party are both Gore Street Energy Trading Limited, the fund's own trading company, and the site already holds two other Gore Street batteries. Source
Attribution. A battery belongs to whoever the documents name today, so a fleet that changed hands during the year credits the whole year to the current owner. Groups are joined only where a filing joins them; a company that holds through several vehicles appears once, under the name at the top of the chain. Directors and registered offices are never used as evidence on their own. Why the registers cannot answer this question