Key Takeaways With global investments in clean energy on the rise, solar power has become one of the fastest-growing sources of electricity. This growing momentum is creating new opportunities for leading solar companies like First Solar ((FSLR) and Canadian Solar ((CSIQ). As interest in renewable energy expands, both companies present strong but distinct cases for investment. U.S.-based First Solar is known for its advanced thin-film photovoltaic solar modules. It focuses primarily on large-scale utility p ...