Why is Thames Water in financial trouble, and what did the 2025 water review propose?
Britain's biggest water company has been called close to collapse since 2023, and the argument is about debt, dividends and who pays.
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Which one is it?
Thames Water is in financial trouble mainly because it carries a very large debt, and the argument is about how it got there and who should pay. Thames Water is the UK's largest water and wastewater services company. It has been criticised for paying substantial to shareholders while taking out loans, and had over £20 billion in debts as of January 2026. From June 2023 it was repeatedly said to be close to financial collapse.
The critics' account focuses on the years after 2006, when RWE sold the company for £8 billion to a consortium led by Macquarie. During the 11 years of Macquarie's ownership ending in 2017, debts increased from £4.14 billion to £10.5 billion as Macquarie borrowed against the company's assets to increase dividend payments, and £2.8 billion was paid to shareholders. The other side of the ledger is investment: after the sale the company announced the largest-ever capital investment programme of any UK water company, and by 2022 it said, with high , it had to invest all its profits back into the business just to maintain the status quo.
Regulators have acted. In July 2024 Ofwat put the company into , and in May 2025 it fined Thames Water £122.7 million, including £18.2 million for breaches relating to dividend payments. Thames Water warned in August 2024 that its survival required bills to rise by 59% over five years, which Ofwat rejected.
The wider review came in July 2025. The Independent Water Commission, chaired by Sir Jon Cunliffe, recommended merging four regulators into one new Regulator for Water, and the government announced that it would abolish Ofwat and bring water functions from four regulators into one.
Try it
A simple model of rising debt
y = 100 · 1.05ˣ
Challenge · Debt went from £4.14bn to £10.5bn in 11 years, about 2.5 times. Find the yearly growth factor that makes 100 reach about 250.
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0/3
Recap
Debt, dividends and investment are the three-way tug of war, and the 2025 review proposed one new regulator.
💡 A trick to remember it · Bills, owners, lenders: three hands tugging one rope, with a regulator as the referee.
Surprising fact · In May 2025 Ofwat fined the company £122.7 million, including £18.2 million for breaches linked to dividend payments.
Connects to
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- 🚇 How did Brunel's iron shield let miners dig under the Thames when engineers said it was impossible?
Sources (3)
No source, no claim. Every fact in this lesson (21 claims) cites at least one of these.