The Cuyahoga County Council's vote scheduled for Tuesday would lock in an agreement with Cleveland Public Power.
Some of the power would come from six wind turbines that are planned to be built in Lake Erie.
It would be the nation's first freshwater offshore wind project. Plans call for the turbines to be operating by 2018.
The power-purchase agreement also calls for some of the electricity to come from a solar farm that would be built on a brownfield in the Cleveland area.
Cleveland.com reports the 10-year contract would cost about $68 million and could be extended over 25 years.