Mannington

What it is

Who owns it and who trades it

How we know. Both project companies are controlled by GRP Battery Finco Ltd, which is controlled by GRP Battery Holdco Ltd. That holdco is shared: GRP III UK Holdings Ltd holds between half and three quarters of it, and KX Power Limited holds between a quarter and a half. GRP III UK Holdings names BlackRock, Inc. of New York as its person with significant control, notified in July 2020. The same house holds a much larger position in the connection queue through KXP Alpha I, II and III, each controlled by KX Power (UK) 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. Elexon's balancing mechanism unit register names the seller here and the name is checked against it on every build. How we tell them apart

Until 30 September 2025 this battery sold as EDFE-13 under EDF ENERGY CUSTOMERS LIMITED, taking −£7k inside this page's year. 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 at the price the agreement cleared at, before inflation uprating, so it is a floor. Method

Outside the balancing mechanism, derived from the meter

Elexon publishes what this unit's meter recorded every half hour. Take away the balancing volumes NESO accepted and what is left is the position the unit ran outside the balancing mechanism: its wholesale trading, its response and reserve delivery, and its losses, together. That position is valued here at the market index for each half hour. The volumes are measured. The price is a public benchmark, not this unit's trade. The product is derived, and is shown apart from the three measured lines above. 343 days to 12 September 2026, 38 of them still provisional in Elexon's settlement runs. Method and caveats

When it moved, against when power was dear

Across every half hour this unit was metered the market index averaged £93.26. What it sent out was worth £100.18 a megawatt hour at that same index, 1.07 times the average. What it took in was worth £82.96, 0.89 times. Selling above one and buying below one is a unit positioned into the dear half hours and out of the cheap ones. It measures the half hours it chose, not the price anyone paid it, which is not published.

Physical checks passed: the meter never exceeded the registered power by more than fifteen per cent, and the year's exports against imports are what a battery does.

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.