Gses 1 (GSET-07)

What it is

Who owns it and who trades it

How we know. 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.

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

Before 31 March 2025 this battery sold as EDFE-15 under EDF ENERGY CUSTOMERS LIMITED. The handover shows in the register as a new code, not a renaming, and the old page keeps its record.

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: 15 units of about 1 hour in England and Wales, metered, earned between £-0.22 and £26.98 per kilowatt a year with the balancing legs and the position outside the balancing mechanism together, £5.98 at the median. Applied to this unit's 45 MW that is £269k, in a range of −£10k to £1.2m. 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. They run for about the same length of time. Same market, same rules, same weather.

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.