Revenues of water company to be cut by regulator Ofwat

Wednesday, 10 December 2025 13:05

By Sarah Taaffe-Maguire, business and economics reporter

The UK's biggest water supplier has been dealt another blow as the regulator decided to reduce its income.

Thames Water, which supplies 16 million people in England, has been told by the watchdog Ofwat its revenues will be cut by more than £187m.

It comes as the utility struggles under a £17.6bn debt pile and the government has lined up insolvency practitioners for its potential collapse.

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Overall, water firms face a sector-wide revenue reduction of nearly £309m as a result of Ofwat's determination. Thames Water's £187.1m cut is the largest revenue reduction.

This will take effect from next year and up to 2030 as part of water companies' regulator-approved five-year spending and investment plans.

The downward revenue revision has been made as Ofwat believes the companies will perform better than first thought and therefore require less money.

Better financial performance is ultimately good news for customers.

The change published on Wednesday is a technical update; the initial revenue projections published in December 2024 were based on projected financial performance but after financial results were published in the summer and Ofwat was able to apply these figures.

Thames Water and industry body Water UK have been contacted for comment.

Sky News