Support project-development studies for electrochemical ultra-long-duration energy storage in the UK. Proposals should assess technology and engineering design, costs, markets, manufacture, supply chains and a development plan for systems supplying grid power for at least 100 continuous hours with a working life of at least 25 years. Phase 1 requests must be £350,000–£700,000 for projects lasting three to nine months, starting by 1 January 2027 and ending by 30 September 2027. The competition is open and closes on 30 September 2026 at 11:00 UK time. The £3 million headline figure is the total competition budget, not an individual award.
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