Ofgem has provisionally selected 16 long duration electricity storage (LDES) projects in the UK for support.

LDES are energy storage systems that can store and release electricity for long periods, helping balance the supply and demand of electricity, especially when using renewable energy sources like wind and solar, which can be unpredictable.  

A ‘minded‑to-decision’ list has been published, with Ofgem setting out which projects have been provisionally selected to receive support across four technologies – pumped storage hydro (PSH), compressed air energy storage (CAES), lithium-ion batteries and vanadium redox flow batteries (VRFB).

The projects are spread across Scotland and England, with one proposed VRFB project selected in North Wales.

The report gives support to three pumped hydro projects: Loch Kemp Storage, Coire Glas, and Earba, in North Scotland, storing 660, 1,440 and 1,800 MW of electricity respectively.

In North East England, Ofgem has backed TeesCAES, a compressed air energy storage system storing 50 MW.

Ofgem will now gather stakeholder views on the proposed decisions to ensure they deliver the best outcomes and value for money for business and consumers.

Akshay Kaul, director general for infrastructure at Ofgem, said: “Ofgem is creating the right infrastructure for renewable energy to thrive and improve our energy security and reduce reliance on global gas markets.

“It’s fantastic to see such a wide range of technologies coming forward.  This takes us a step closer towards the long-duration energy storage we need in a clean power system to maintain secure supply during periods of cold, hot, still or cloudy weather when solar or wind power output may be low.”

The consultation will remain open until 7 August, with final determinations expected later this year. Unsuccessful projects may have the opportunity to participate in further selection windows – the design of which Ofgem expect to consult upon later this year – or proceed as merchant projects.

For the full list of projects, click here