The city of Portland is asking for proposals to install electricity-generating solar panels on the roofs of the Portland International Jetport and several other city-owned buildings.

Portland officials believe the rooftops may be good sites for photovoltaic panels and said in a news release Wednesday it is offering the rooftops to a company that would install the panels and sell the power to the city at or around the market price.

The city identified five buildings as potential sites for the panels: the jetport, the library storage facility on Riverside Street, Portland Arts and Technology High School on Allen Avenue, King Middle School on Deering Avenue and Bramhall Fire Station on Congress Street.

Since 2010, the city said in the release, Portland has reduced its energy costs by 30 percent and its greenhouse gas emissions by 16 percent as a result of more-efficient lighting, sensors, equipment and education.

Portland already has a number of small-scale solar installations for educational purposes on school buildings including Lincoln Middle School, Portland Arts and Technology High School, East End Elementary School, and King Middle School.

The deadline for proposals is Aug. 6. More information is posted on the city’s website.