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UK power capacity to nearly double by 2035 as renewables surge

GlobalData forecasts a big build-out, but grid delays could slow the benefits for households

16 October 2026 ยท Eleanor Whitfield ยท Fuse Energy

Capacity set to surge

The UK's installed power capacity is forecast to almost double between 2025 and 2035, according to a new GlobalData report. Renewables are expected to make up 73% of the generation fleet by the end of that period, led by offshore wind, solar PV and onshore wind. Renewable sources should also deliver roughly two-thirds of gross power output.

Renewables take the lead

Offshore wind is central to the UK's clean power strategy, the report states. Gas-fired plants will stay in the mix for flexible balancing while nuclear adds firm low-carbon output. Rising electricity demand from electrified transport, heating and industry is the main driver behind the expansion.

Grid delays remain the sticking point

The biggest barrier is the grid itself. Connection queues and slow transmission upgrades mean many ready projects face hold-ups. National Energy System Operator, transmission owners and Ofgem are working on reforms, yet the analyst notes the real task is now turning the pipeline into operating assets. We recently covered the Energy Secretary's call for an overhaul over exactly these grid and price issues.

What households can do now

Bigger renewable output should eventually ease pressure on bills, but only if the network catches up. Compare current tariffs on our energy pages to lock in the best deal while the system changes.

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