Solar is worth more on Long Island than anywhere else in U.S. The best place to generate cash from a solar farm in the U.S. isn’t California or sunny Florida—it’s Long Island. Last year, solar in New York City and Long Island earned an average of about $45 a megawatt-hour, compared with as little as $15 a megawatt-hour in Southern California, according to a report from Bloomberg NEF. (Crain's New York Business)