Great Britain · the operating fleet
Jamesfield
One physical site, registered with the market as 2 balancing units, 49 MW in Eastern Grampian and Tayside. The market settles each unit on its own; this page adds them back up. Everything is read from published data for the 364 days to 16 October 2026.
The site
| Registered power, live units | 49 MW |
| Balancing units | 2 |
| Charging zone | Eastern Grampian and Tayside |
| Owned by | HARMONY JF LIMITED |
| Ultimately | TagEnergy confirmed |
| Traded by | Tesla Motors Limited |
What the site earned, all units together
| Line | 364 days to 16 October 2026 |
|---|---|
| Balancing mechanism, paid to discharge | £460k |
| Balancing mechanism, paid out to charge | −£3.0m |
| Response and reserve auctions | £475k |
| Capacity market | £558k |
| Three measured lines together | not netted |
Income per kilowatt across the whole site: £30.57/kW/yr on the three measured lines, before charging costs and before wholesale trading, which nobody publishes. Each unit's own page carries its estimate and its percentiles.
The units
| Unit | MW | Discharge | Charge | Standing ready | CM |
|---|---|---|---|---|---|
| E_JAMBB-1 Tesla Motors Limited | 30 | £270k | −£1.8m | £259k | £558k |
| E_JAMBB-2 Tesla Motors Limited | 19 | £190k | −£1.2m | £216k | — |
Grouped on evidence, not on a name: shared unit code stem JAMBB, all 2 units within 0.1 km. Portfolio families that share a code stem across distant sites, such as an aggregator's fleet, are never grouped. Methods