NatPower UK delivers 100% success rate with full portfolio of 9.5GW LDES moving into Ofgem Phase 2.
NatPower UK delivers 100% success rate with full portfolio of 9.5GW LDES moving into Ofgem Phase 2.
NatPower’s projects represent nearly 50% of all Li Battery Storage capacity successfully through the Eligibility stage of Ofgem’s LDES Cap and Floor Scheme, reinforcing the company’s position as a national leader in long-duration energy storage
(London, UK – 19 November 2025) NatPower UK has achieved a major national milestone with all ten of its Long Duration Energy Storage (LDES) projects successfully submitted to the final appraisal Phase of Ofgem’s LDES Cap & Floor Scheme. Totalling 9.5GW and 76GWh, the portfolio now moves into Ofgem’s final cost benefit analysis phase, prior to award in Spring 2026. With nearly 50% of all Li Battery Storage capacity through to the final stage, NatPower confirms it’s position as the national leader in long duration storage.
This progress comes at a crucial time for the country. The UK currently operates around 8GW of energy storage, while at least 50GW of flexible capacity will be needed by 2035 to balance the UK’s renewable power generation, cut renewables curtailment costs for consumers and maintain system stability. NatPower’s portfolio directly responds to this national requirement at the scale needed, offering one of the most advanced and investible long-duration storage programmes in Britain.
NatPower’s total portfolio, which includes additional long duration battery storage plants not put in the Ofgem Cap & Floor scheme, comprises 13 plants with a total of 12.5GW and 100GWh of power storage.
The portfolio is designed to deliver significant benefits for households and businesses by storing renewable power that would otherwise be curtailed during times of excess generation, reducing consumer energy bills by around £3.5 billion annually in wind curtailment costs alone. The sheer size and technical characteristics of NatPower’s portfolio will also allow the UK to eliminate the reliance on costly and carbon-intensive gas peaker plants and support the UK’s shift towards self generated energy production, greatly increasing energy security and stabilising electricity prices, so the country is no longer exposed to inflationary price shocks coming from external events such as Russia’s invasion of Ukraine, with a cleaner, more affordable and more secure power system.
NatPower’s programme shall bring £10 billion in private investment to the UK’s economy, adding £6.5 billion in economic growth across the UK. It will create 2,200 construction jobs and up to 300 long-term skilled roles, strengthening local supply chains and supporting the country’s industrial and economic resilience. In addition, attracting additional international investment in other key areas requiring stable, clean power such as data centres,
Over their lifetime, the projects shall generate £2.5 billion in tax contributions and provide £1 billion to local communities to transform them into the most sustainable communities in the Country and directly bring them the economic benefits of the Green and Blue Economy.
Environmental stewardship is built into the portfolio from the outset. As we commit to achieving over and above the legally required biodiversity net gain of 10% – with a target of up to 100% on every site, where possible.. This ensures that critical energy infrastructure also drives long-term improvements in nature recovery and environmental quality.
These projects represent a significant contribution to the nation’s grid resilience and energy security, being an insurance policy to avoid black-outs like the one recently occurred in Spain, which would cost £1.8 billion per day to UK Plc
Stefano D.M. Sommadossi, CEO of NatPower UK, said:
“Achieving a full success rate across all ten of our LDES submissions is an outstanding result and a proud moment for everyone involved. These projects will help cut energy costs, reduce emissions, improve energy security and deliver long-lasting benefits for communities across the UK. We are immensely grateful to the colleagues, partners and advisors whose commitment and expertise made this milestone possible. We remain determined to help build the energy system Britain needs for the decades ahead.”