People have more reasons than ever to turn to solar energy. Aside from reducing their carbon footprint and saving money on their electricity bill, consumers can actually earn returns on their solar panels! With 72.2 gigawatt hours worth of solar energy generation (up from 891 gigawatt hours in 2009), mass adoption is right around the corner. Given the consumer trends and growing push for sustainable energy, solar stocks could be solid long-term investments. Some of best-performing solar companies include Vivint Solar (VSLR), Enphase Energy (ENPH), Solaredge Tech (SEDG) and Vivopower International (VVPR).