Varco Energy (Adaptogen Capital)
Owns 2 batteries at 2 sites, 114 MW, which is 1.7 per cent of everything operating in Great Britain. It sells none of that power itself. The register names one seller for the whole fleet, Arenko Cleantech 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 |
|---|---|---|---|
| Arenko Cleantech Limited | 2 | 114 | 100% |
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 | £4.7m |
| Balancing mechanism, paid out to charge | −£1.9m |
| Response and reserve auctions | £663k |
| Capacity market | £927k |
| Income across the fleet, per kilowatt | £54.90/kW/yr fleet 35.48 |
| Median battery, all three lines | £45.13/kW/yr |
| Hours at full power, sent out | 399 h/yr |
| Hours at full power, taken in | 255 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 |
|---|---|---|---|---|
| Sizing John South Lancashire, Yorkshire and Humber | 57 | Arenko Cleantech Limited | confirmed | 64.68 |
| Native River North Midlands and North Wales | 57 | Arenko Cleantech Limited | confirmed | 45.13 |
One battery ran under an earlier registration for part of the year, NTVRB-1. 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 Sizing John, Cheshire West and Chester (NTVRB-1) (earlier registration)
Sizing John, Native River and Al Boum Photo are the 2017, 2018 and 2019 Cheltenham Gold Cup winners, and all three companies share one registered office with Varco Energy and the Adaptogen Battery Storage fund. The control filing on Sizing John Limited runs to Varco Energy Holdco 1 Limited. Source
Confirmed Native River
Varco's own site and the GE Vernova supply announcement. 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