The solar panels on Exeter City Council buildings have generated more power than expected.
The hot summer means more power has been supplied in the eight months since they were fitted in March than was predicted for the whole year.
The panels are on, among others, the Civic Centre, Oakwood House offices and the museum's storage facility.
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Six-storey block planned for city centre location
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Government urged to go back to the drawing board
New apartment block plan for old Exmouth gas works
Plans have been submitted for 26 homes
Frustration over cancelled Exeter elections
Opponents unite to demand Exeter elections
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Devon politicians will head to the capital
