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Tideway who are constructing and will operate the sewer is a separate company from Thames Water. Thames via customer bills is paying 1.2bn, Tideway then raised £1.7 billion of debt and £1.3 billion of equity. Of the debt, about £1 billion came from bond sales and £700 million of debt comes from a European Investment Bank loan. Customers bills then keep paying tideway to operate it via bills.
Yes and no, yes asset maintenance, replacement and creation is paid for by bill payers but the cost is spread over the bill for decades, the money to pay for the investment is funded via debt