Vitreous LabsEnergy transparency

Maldon

36 MW, about 36 MWh (1 hour, from the capacity market de-rating class) in Essex and Kent. Everything on this page is read from published data for the 364 days to 27 September 2026, or is labelled as an estimate.

What it is

Registered power36 MW response and reserve auction registration
Storage duration1 hour capacity market de-rating class
Charging zoneEssex and Kent
Connection siteMaldon
PostcodeCM9 6LJ
Balancing mechanism unitV__AFEEL002 a virtual unit registered by the company that trades it; its balancing actions are not yet counted on this site
Reserve auction codesEDFE-17 until 10 July 2025; AG-EDF01C from 19 July 2025 the same battery under a new code, usually a new company trading it; its money here is both codes together

Who owns it and who trades it

Traded byEDF ENERGY CUSTOMERS LIMITEDruns several sitesauction results, unchecked
Owned byMALDON BESS LIMITED
Owner established fromcapacity market registered holder
UltimatelyEku Energy confirmed source

How we know. Eku's own project page for Maldon.

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 is built from

Battery systemTrina Storage (also services and maintains); ESM Power a partner
Entered operation2024-09 (commissioned; first auction 4 September 2024 agrees)

From published documents, not from any register: supplier and contractor project pages, owner announcements and the trade press. Confidence: confirmed. Checked 2026-08-31. source 1 · source 2. Fields not shown are not published anywhere we have found, and we do not guess them.

What it earned

Line364 days to 27 September 2026
Balancing mechanismnot yet counted
Response and reserve auctions auction implied£3.3m
Capacity market£302k
Three lines together£3.6m

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

Elexon publishes no metered output for this battery. Its balancing registration, V__AFEEL002, is a virtual unit registered by the company that trades it, and this site reads no meter for it, so nothing outside the balancing mechanism can be derived for it. We give it no estimate either. It was paid £92.96 per kilowatt a year in the response and reserve auctions, which means it spends most of its time held in those services rather than trading. The 4 batteries with a published meter that were paid £60 or more per kilowatt a year in the auctions made between −£15.34 and −£2.16 per kilowatt a year outside them, balancing included: they buy power only to cover their losses while they are held. Borrowing a figure from batteries that trade would overstate this one. Method

Where it stands

All three measured lineswhole fleet, £/kW/yr96th percentile229 units

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.

BatteryMWHoursMeasured, per kW
Maldonthis battery361h£101.4/kW/yr
Port of Tyne Energy Storage350.7h£62.2/kW/yr
Fareham Reserve 2361h£37.6/kW/yr
Loudwater331h£32.9/kW/yr
Potmans Lane351h£22.6/kW/yr
Conrad (FLITWICK)361h£16.9/kW/yr

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.