Otezla. show more of you. welcome back, "california li live", california reached a milestone this spring, producing enough renewable energy to meet demand, but as reported, there's a debate over who pays to maintain the grid. >> reporter: power of the sun is free. not the solar systems that harness it. and increasingly, there are financial winners and losers uc berkeley professor dorenstein studies the economics of renewable energy. >> all the data shows the customers putting in solar are dispro disproportionately wealthy, shifting costs on to those poorer than they are. >> homeowners have a...