Solar City, a company that designs, installs, and leases out solar power systems to home and business owners, announced that it will bring renewable electricity to some 30 Wal-Mart stores in California and Arizona. Chief executive and founder of Solar City, Lyndon Rive [pronounced like “five”] spoke with TechCrunch about helping Wal-Mart go greener, what his company looks for in solar technology providers, and why the United States is simply not a solar leader -- yet.