Top 10 global utility companies

Based in Chicago, Illinois, Exelon is a Fortune 100 company and one of the largest electricity organisations in America. 

The company is a stalwart investor in renewable energy. However, despite being located in the 'windy city', Exelon's renewable fuel of choice is nuclear. With full or partial ownership of 23 reactors, the company owns a total capacity of 35,000MW.