More solar panels on the roof of a car park could cut bills by up to £58,000 every year, a council says.
Worcester City Council is to spend £521,000 installing the panels on the roof of St Martin's Gate car park in City Walls Road.
Joint council leader Marjory Bisset said the move would increase the amount of energy produced by nearly 450%.
It would mean up to 38 spaces would be lost from the 700-space car park.
But the council said the resulting loss of income would be minimal as the car park was only ever full in the run-up to Christmas.
Councillors earlier agreed to set aside £710,250 for the work and also for panels at Perdiswell Leisure Centre.
Kevin Moore, the city council's head of property, said the council was still applying for specific swimming pool funding from Sport England.