Solar panels on the roof of the Geoff Moulder Leisure Complex in Boston are said to have proved a success - generating in excess of £10,000 more than predicted.
Figures released by Boston Borough Council show that since February 2012 to December last year, the system produced a total benefit of £60,787 compared to a predicted £49,319.
Installation cost just over £105,000 for 200 panels in 2012 - and the system is now estimated to pay for itself within six years.
Since installation it is estimated there has been a carbon saving of almost 70 tonnes.
The figures do not include extra solar power generated by a second installation last summer on the roof of the complex.
CounPeter Bedford, leader of the borough council, said: “We hear the phrase ‘no brainer’ being bandied about. But in this case it is proving to be no exaggeration.
“Use of a clean, renewable energy system such as the solar array at the Geoff Moulder Leisure Complex really has proved to be a no brainer.
“This is further evidence of action by the council to reduce its carbon footprint and save on energy costs by making best use of the latest available technology.
“That is precisely why we have proposed doing the same for the Princess Royal Sports Arena.”