Eku Energy Buys a 300 MW Battery Site at Didcot, Connected Straight to the Transmission Grid
Eku Energy announced on 31 July that it has bought a planned 300 MW / 600 MWh battery storage project near Didcot in Oxfordshire, its first transmission-connected battery in the UK.
What was announced
According to trade reports, the site sits about two miles north of Didcot and was bought from TBC Partners. It is planned as a two-hour system, so 300 MW of power for roughly two hours gives the 600 MWh figure. Financial terms were not disclosed.
The battery would connect by underground cable to the 400 kV Didcot substation, which National Grid has recently upgraded with new bays and transformers. Construction is due to start later in 2026, with grid connection scheduled for 2028. Those dates come from the reports of the deal, and projects like this can slip.
Why transmission connection matters
Most UK home batteries connect to the local distribution network, the wires that run down your street. This project would plug into the high-voltage transmission system instead, where it can respond to national balancing needs. That is a different job from the one a home battery does, but both are doing the same basic thing: soaking up electricity when there is plenty and releasing it when there is not.
For scale, our own arithmetic: 600 MWh is 600,000 kWh. A typical 10 kWh home battery would need to be repeated about 60,000 times to match it. A single site like this does not replace household storage, and household storage does not replace it. They sit at different points on the grid.
Good to know
Project capacity is quoted in MW (power) and MWh (energy). The same two units apply to a home battery in kW and kWh, just a thousand times smaller.
What it means for households
We could not find anything in the announcement that changes what a household pays or earns. Large batteries can help the system absorb surplus wind and solar, which is a long-term benefit to everyone, but the deal itself says nothing about bills.
If you are weighing up your own battery, the useful starting point is still your own usage. Our home battery calculator lets you test a size against your own numbers, and our explainer on how a home battery saves money covers what drives the savings.
Sources
- The Energyst: Eku Energy acquires transmission connected 300MW/600MWh Didcot BESS from TBC Partners
- Energy Global: Eku Energy acquires transmission-connected BESS from TBC Partners
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