Roundponds Storage

What it is

Who owns it and who trades it

How we know. 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.

Market registers name the party that sells into the market, which for a battery is usually an optimiser under contract rather than the owner. This unit is registered only in the response and reserve auctions, so the seller is the participant NESO's auction results name, and Elexon's register carries no entry to check it against. How we tell them apart

What it earned

Balancing is offer revenue and does not net off the cost of the power. The response and reserve figure is the value implied by the published auction results, award quantity times clearing price times the length of the delivery window, and not a settled payment. Capacity market income is the cleared price raised for inflation where the auction set a base period, split by month on EMRS's weights. Method

Outside the balancing mechanism, estimated from metered peers

Elexon publishes no metered output for this registration, an auction unit rather than a balancing mechanism unit, so nothing can be derived for it. What can be said is what its peers did: 8 units of about unknown hours in England and Wales, metered, earned between £-11.99 and £3.12 per kilowatt a year with the balancing legs and the position outside the balancing mechanism together, £-0.08 at the median. Applied to this unit's 16 MW that is −£1k, in a range of −£192k to £50k. An estimate from other batteries, never this one's figure. Method

Where it stands

Percentiles, so 90 means better than nine in ten of the cohort named beside it, on that measure alone, over the same 364 days. Rates are pounds per kilowatt per year, annualised over the days the unit has been on the system, the same figures the performance league ranks on. A high position in the taken-in table is not a fault: a constraint asset is paid to charge, and charging is its job.

The nearest comparables

The five nearest in size in England and Wales, and this battery among them, ranked by what each was paid for every kilowatt it holds over the 364 days to the same date. How long this battery can run for is not published, so duration is not used to choose them. Same market, same rules, same weather.

The response line is negative, and that is what the published auction results say. The high direction response services, where a battery commits to absorbing power rather than exporting it, have been clearing below zero, so a unit holding those contracts pays for the position instead of being paid for it.

See it on the map

Open the operating map here

Every figure on this page traces to a published file. If something here is wrong about your asset, the methods section says how to tell us.