 The energy sector of Ohio is composed of thousands of companies and cities representing the oil , natural gas , coal , solar , wind energy , fuel cell , biofuel , geothermal , hydroelectric , and other related industries . Oil and natural gas accounts for $ 3 @.@ 1 billion annually in sales while ethanol generates $ 750 million . The state is second nationally in solar energy industry manufacturing as Toledo is considered a national solar hub , nicknamed " Solar Valley . " It is recognized internationally as the " Fuel Cell Corridor " , and Hamilton is poised to become the biggest municipal provider of renewable energy in the Midwest , and one of the largest in the country , with over 70 % . In 2008 , the state led the country in alternative energy manufacturing according to Site Selection Magazine , while the natural gas industry has experienced growth due to the Great Shale Gas Rush . 
