Clay Tye Farm
One physical site, registered with the market as 2 balancing units, 99 MW in Essex and Kent. 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 27 September 2026.
The site
| Registered power, live units | 99 MW |
| Balancing units | 2 |
| Charging zone | Essex and Kent |
| Owned by | HARMONY CTF 2 LIMITED |
| Traded by | Tesla Motors Limited |
What the site earned, all units together
| Line | 364 days to 27 September 2026 |
|---|---|
| Balancing mechanism, paid to discharge | £5.4m |
| Balancing mechanism, paid out to charge | −£3.5m |
| Response and reserve auctions | £1.2m |
| Capacity market | £1.1m |
| Three measured lines together | £4.1m |
Income per kilowatt across the whole site: £77.02/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_CLAYB-1 Tesla Motors Limited | 50 | £2.6m | −£1.6m | £544k | — |
| E_CLAYB-2 Tesla Motors Limited | 50 | £2.8m | −£1.8m | £628k | £1.1m |
What it is built from
| Battery system | Tesla, Megapack (with Autobidder) |
| Power conversion | Tesla (integrated in Megapack) |
| Entered operation | 2024-03 |
| Container count | 52 Megapacks; 198 MWh over 52 is 3.81 MWh each, the Megapack 2XL figure, so the count and the spec agree |
| Transformers | 26 x 4,200 kVA 33kV/480V-480V Wilson T2 MV transformers, one per two Megapacks; 2 x 150 kVA auxiliary earthing transformers |
| Connection voltage | 33 kV collection to a UKPN distribution connection documented: transformer schedule from the supplier |
From published documents, not from any register: supplier and contractor project pages, owner announcements and the trade press. Confidence: confirmed. Checked 2026-08-30. source 1 · source 2. Fields not shown are not published anywhere we have found, and we do not guess them.
Grouped on evidence, not on a name: shared unit code stem CLAYB, 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