The FTSE 100-listed water company said last year’s record heatwave added an extra £22mln to its cost base.
However, Severn Trent still reported a 7.8% rise in pre-tax profits to £563mln in the 12 months ended 31 March (2018: £527mln), helped by lower tax rates and cheaper interest repayments. Group turnover rose 4.2% to £1.77bn (2018: £1.69bn).
In line with its policy to raise its dividend by the retail price index (RPI) inflation plus 4%, the company upped its final pay-out by 7.9% to 56.02p.
“This has been a year where our teams have really stepped up, whether in response to customer needs in the face of one of the hottest and driest summers we've seen or by being named by Ofwat as one of the top companies in the sector when we received fast-track status for our future plans,” said the firm's chief executive Liv Garfield.
Severn Trent shares edged 0.7% higher to 1,934p in early deals on Tuesday.