
UK: National Grid delivered a record year for electricity connections in 2025, plugging 2.4 GW of new generation into the transmission network. Six major projects were completed, with landmark renewable schemes at the heart of the programme, including Britain’s largest solar farm and its biggest battery energy storage system.
The work builds on the 3 GW of new connections achieved in 2024, which featured a new interconnector between Wales and Ireland. Over the last five years, National Grid has connected 12.6 GW of generation capacity across England and Wales.
In April, Britain’s largest solar array, the 373 MW Cleve Hill Solar Park, started exporting electricity after National Grid completed connection works at its Cleve Hill substation in Kent. Later in September, National Grid finished upgrades and commissioning at the Lackenby substation in North Yorkshire, preparing the site for RWE’s Sofia Offshore Wind Farm, one of the largest offshore wind projects in the world.
Battery storage was another major focus. Over the summer, Statera Energy’s Thurrock Storage project, the UK’s largest battery energy storage system, connected to National Grid’s Tilbury substation in Essex, adding 300 MW of flexible capacity for London and the South East. In total, more than 400 MW of additional battery storage connections were completed during 2025, with projects across West Yorkshire, North Yorkshire, Leicestershire, Merseyside and Greater Manchester.
National Grid also delivered nearly 0.5 GW of demand connections. In November, the company energised its new Little Horsted substation in East Sussex, enabling UK Power Networks to supply homes and businesses and meet rising demand. Elsewhere, upgrades at Willesden supported power supply for a new data centre.
By working closely with developers and its supply chain, National Grid is helping to decarbonise the power system while ensuring reliable electricity for homes and businesses.
Source: National Grid
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