nuclear-news

UK Nuclear output sinks to 40-year low

Lastest stats from DESNZ show the pressures of the transition in terms of generation, demand and fuel mix

Energy Live News 30th July 2026

UK nuclear generation fell to its lowest level since the 1980s last year, forcing greater reliance on gas even as renewable output reached another record.

Official DESNZ figures show nuclear generation dropped 12% in 2025 to 35.9TWh because of refuelling, planned maintenance and unplanned outages across the ageing fleet. The decline helped push the low-carbon share of electricity generation down slightly to 64.3%.

The fall comes at a difficult time for Britain’s power system.

Electricity demand increased 1.2% to 323TWh while the Government is preparing for much sharper growth from electric heating, transport, industrial electrification and data centres.

New nuclear projects are not expected to arrive quickly enough to replace all the output lost as older stations close. That creates a growing gap between the existing fleet and future projects including Hinkley Point C, Sizewell C and planned small modular reactors………………………………………………………

Renewable generation rose 5.9% to a record 153TWh and supplied 52.1% of UK electricity. It was only the second year in the published series that renewables provided more than half of generation………………………………………

Data centres are becoming an increasingly important part of that picture. DESNZ estimates they consumed 4.5TWh of grid electricity in 2024, up from 1.3TWh in 2020.

That represents an increase of 246% in four years and helps explain Ofgem’s concern in the surge in speculative data centre connection applications………………………………………………https://www.energylivenews.com/2026/07/30/nuclear-output-sinks-to-40-year-low-as-power-demand-rises/

August 2, 2026 - Posted by Christina Macpherson | ENERGY, UK