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.
MP frustrated over Torbay Hospital funding
Conservative and Labour governments both blamed for under-investment
Plans for affordable homes on Exeter County Hall site
Step forward expected
Teenager jailed for train station rape
He also sexually assaulted a girl on a train
Anger over planned Plymouth road closure
Traffic would be diverted to congested Deep Lane Junction
Cyclist in serious condition following hit and run
Bovey Tracey road closed for several hours
