Ofgem pushes ahead with long-duration storage plan

3 July 2026

Energy regulator Ofgem has moved forward with plans to expand long-duration electricity storage (LDES), publishing a list of 16 projects shortlisted to progress under its cap and floor regime.

The proposals mark the transition from eligibility checks to the next stage of selection, with a formal consultation now open before final decisions are made later this year. The scheme is designed to support technologies capable of storing electricity for eight hours or more, helping to balance a grid increasingly powered by wind and solar.

The shortlisted portfolio spans pumped storage hydro, compressed air energy storage, lithium-ion batteries and vanadium redox flow batteries, with projects located across Scotland, England and north Wales. Ofgem says the developments could cut system costs by easing pressure on transmission and distribution networks and reducing the need for additional infrastructure investment.

The regulator has emphasised that LDES will play a key role in ensuring security of supply during periods of low renewable output, such as calm or overcast weather conditions.

Akshay Kaul, director general for infrastructure at Ofgem, says:

“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 August 7, 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.