Gresham House Energy Storage Fund
Owns 26 batteries at 26 sites, 812 MW, which is 10.4 per cent of everything operating in Great Britain. It sells none of that power itself. The register names 8 other companies as the sellers: Habitat Energy Limited, Octopus Energy Trading Limited, Arenko Cleantech Limited and 5 others.
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 |
|---|---|---|---|
| Habitat Energy Limited | 9 | 349 | 43% |
| Octopus Energy Trading Limited | 7 | 272 | 33% |
| Arenko Cleantech Limited | 3 | 65 | 8% |
| BGI Trading Limited | 1 | 45 | 6% |
| Equinicity LTD | 3 | 37 | 5% |
| EDF Energy Limited | 1 | 28 | 3% |
| Anesco Limited | 1 | 8 | 1% |
| Statkraft Markets GmbH | 1 | 8 | 1% |
What it was paid
The three published lines, added up across the fleet for the 364 days to 27 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 | £1.6m |
| Balancing mechanism, paid out to charge | −£2.2m |
| Response and reserve auctions | £14.5m |
| Capacity market | £10.0m |
| Income across the fleet, per kilowatt | £32.28/kW/yr fleet 42.17 |
| Median battery, all three lines | £13.66/kW/yr |
| Hours at full power, sent out | 65 h/yr |
| Hours at full power, taken in | 309 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 |
|---|---|---|---|---|
| Grendon Mid Wales and The Midlands | 50 | Habitat Energy Limited | confirmed | 76.32 |
| Melksham East Cotswold | 49 | Habitat Energy Limited | confirmed | 107.34 |
| Red Scar South Lancashire, Yorkshire and Humber | 49 | Habitat Energy Limited | confirmed | 13.66 |
| Wickham Market Mid Wales and The Midlands | 49 | Habitat Energy Limited | confirmed | 6.31 |
| York South Lancashire, Yorkshire and Humber | 49 | Habitat Energy Limited | confirmed | 52.97 |
| Melksham West Cotswold | 49 | Habitat Energy Limited | confirmed | 37.33 |
| Enderby Mid Wales and The Midlands | 45 | BGI Trading Limited | confirmed | 35.07 |
| West Didsbury North Midlands and North Wales | 45 | Octopus Energy Trading Limited | confirmed | 14.64 |
| AR0006-BLOX Mid Wales and The Midlands | 42 | Octopus Energy Trading Limited | confirmed | 23.33 |
| Coupar Battery Storage Eastern Grampian and Tayside | 41 | Octopus Energy Trading Limited | confirmed | 11.92 |
| Shilton Lane BESS South West Scotland | 40 | Octopus Energy Trading Limited | confirmed | 6.04 |
| Stairfoot North Midlands and North Wales | 40 | Octopus Energy Trading Limited | confirmed | 10.01 |
| Glassenbury Essex and Kent | 40 | Habitat Energy Limited | probable | 0.00 |
| Port of Tyne Energy Storage North East England | 35 | Arenko Cleantech Limited | confirmed | 65.99 |
| Arbroath Battery Storage Eastern Grampian and Tayside | 34 | Octopus Energy Trading Limited | confirmed | 15.32 |
| West Bradford South Lancashire, Yorkshire and Humber | 29 | Octopus Energy Trading Limited | confirmed | 29.42 |
| Byers Brae (EDF01N) Stirlingshire and Fife | 28 | EDF Energy Limited | confirmed | 14.80 |
| Carnegie Road 1 North Midlands and North Wales | 20 | Arenko Cleantech Limited | confirmed | 59.66 |
| Roundponds Storage Cotswold | 16 | Equinicity LTD | confirmed | −14.29 |
| Lockleaze Cotswold | 15 | Equinicity LTD | confirmed | −2.78 |
| Nevendon Essex and Kent | 10 | Arenko Cleantech Limited | confirmed | 13.25 |
| Glassenbury extension Essex and Kent | 9 | Habitat Energy Limited | confirmed | 30.55 |
| Littlebrook Essex and Kent | 8 | Anesco Limited | confirmed | 28.46 |
| Cleator Storage North Lancashire and The Lakes | 8 | Statkraft Markets GmbH | confirmed | 36.48 |
| Rufford North Midlands and North Wales | 6 | Equinicity LTD | confirmed | −6.59 |
| Wolverhampton Mid Wales and The Midlands | 5 | Habitat Energy Limited | confirmed | 4.08 |
5 batteries ran under an earlier registration for part of the year, BFSE01, BYBRB-1, HAB5-FFR, MNOR-01, NFSE02. 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 York, AR0006-BLOX, Coupar Battery Storage, Arbroath Battery Storage, West Bradford, Byers Brae (EDF01N), Carnegie Road 1, Glassenbury extension, Cleator Storage, Wolverhampton
The registered office of each company names Gresham House Asset Management, read company by company on 31 August 2026. The address alone would not settle it, because 875 companies sit at 5 New Street Square; the care of line naming the manager is the discriminator. Source
Confirmed Red Scar, Wickham Market, Roundponds Storage, Littlebrook
Each HC ESS company is registered care of Gresham House Asset Management. The control filing on HC ESS4 runs to Grid Holdco 1 Limited since 22 August 2025, and Grid Holdco 1 is held in turn by Gresham House Energy Storage Holdings Limited. Source
Confirmed Grendon
Statera's Grendon page names Gresham House Energy Storage Fund plc as project owner, with Statera as developer, EPC and O&M. Source
Confirmed Melksham East
Statera's Melksham East page names Gresham House Energy Storage Fund plc as project owner, with Statera as developer, EPC and O&M. Source
Confirmed Melksham West
Statera's Melksham West page names the fund as owner; Habitat's virtual unit V__HHABI019 is registered as Melksham West. Source
Confirmed Port of Tyne Energy Storage, Nevendon
The fund announced buying Port of Tyne and Nevendon on 1 February 2021. Source
Confirmed Enderby
Statera's Enderby page names Gresham House Energy Storage Fund plc as project owner, with Statera as developer, EPC and O&M. Source
Confirmed West Didsbury
Statera's West Didsbury page names Gresham House Energy Storage Fund plc as project owner, with Statera as developer, EPC and O&M. Source
Confirmed Shilton Lane BESS
The register names no owner. Gresham House bought the 40 MW Shilton Lane project near Glasgow in 2022, and the capacity market holds three Shilton agreements at that location belonging to Gresham House Energy Storage Holdings plc. Source
Confirmed Stairfoot
The SPV is registered c/o Gresham House Asset Management (Ofgem licence notice, November 2022). Source
Confirmed Mnor-01 (earlier registration)
The register names no owner. The capacity market holds Stairfoot 1 belonging to Gresham House Energy Storage Fund plc 70 metres away, and Stairfoot Generation Ltd is already confirmed to the fund. Source
Confirmed West Lothian (earlier registration)
The register names no owner. The capacity market holds Byers Brae Battery Storage belonging to Gresham House Energy Storage Holdings plc 880 metres away. Source
Confirmed Byers Brae (BYBRB-1) (earlier registration)
The register names no owner and NESO places the code at Arbroath, DD11 2QH. The code stem, the dates and Octopus's Elexon unit named Byers Brae say it is Byers Brae, the fund's West Lothian battery, which EDF01N took over two days after this code was last paid (gb/fleet_joins.py, 26 September 2026); either way it is the fund's. Source
Confirmed Lockleaze
The register names no owner. The capacity market holds the Alpha site belonging to HC ESS2 Holdco Limited 110 metres away, and HC ESS2 is a Gresham House company. Source
Confirmed Rufford
The register names no owner. The fund's factsheet of 31 December 2024 lists Rufford, Nottinghamshire, 7 MW, and its 2025 annual report names Rufford among the five assets bought at the IPO; RUFF-1 is 6 MW at NG21 0HR, Rufford, sold by Equinicity like the fund's other seed assets LNOR-01 and HNOR-01. Source
Probable Bfse01 (earlier registration)
The register names no owner. The capacity market holds the Enderby Storage agreements 260 metres away in the name of Statera Energy Limited, and Statera's own Enderby page names Gresham House Energy Storage Fund plc as the owner with Statera as developer. Source
Probable Glassenbury
The register names no owner and places this unit only by postcode district. Glassenbury Storage, a Gresham House Energy Storage Fund plc site of about the same size, sits inside that district, and the smaller Glassenbury unit is already confirmed to the fund. Source
Probable Cumberland (earlier registration)
The register names no owner and places this unit only by postcode district. Cleator Storage, a Gresham House Energy Storage Fund plc site, sits inside that district, and the other Cleator unit is already confirmed to the fund. 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