Money manager Noel Rahn had no experience in renewable energy when he launched Edina-based Geronimo in 2005. Last year, his company won a state contract to develop Minnesota’s largest solar power installation, a $250 million project that will reach across 16 counties. (Known as Aurora, it is being built by Italian renewable energy powerhouse Enel Green Power SpA, a Geronimo investor.) Rahn launched Geronimo as a wind-power company, driven by his belief that landowners like himself weren’t being treated fairly by wind developers. Geronimo now has almost $2 billion worth of wind projects under construction in six Midwestern states. In 2013, Geronimo moved into solar, where it sees hot opportunities thanks to customer demand and low panel prices. The company is planning to add more than 3,000 megawatts to its portfolio in the coming year.