Thames Water is Britain's largest water utility. It is the only English water company with over 80% of debt relative to its assets; Ofwat, the industry regulator, recommends 55% and the industry average is about 70%.
Under its previous owners, Macquarie, an Australian investment firm, Thames Water's borrowing ramped up significantly. A surge in borrowing costs and higher performance-related fines from Ofwat shook the model. In mid-2025 KKR, the private-equity giant, decided not to inject fresh cash after due diligence. The Ontario Municipal Employees Retirement System has written its 31.7% stake down to zero. Distressed-debt specialists Silver Point Capital and Elliott Management have swooped in.
Thames Water reported an annual pre-tax loss of £1.6bn ($2.2bn). It is cash-starved and may not be far from special administration, a type of insolvency. The government has said it hopes to avoid that outcome; if the company went bust, calls from the Labour backbenches for outright nationalisation might be difficult to ignore.
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