Warren Buffett controls Nevada’s legacy utility. Elon Musk is behind the solar company that’s upending the market. Let the fun begin. ... SolarCity’s success is partly because the government provides subsidies and enables an arrangement called net metering, which allows homeowners with panels to sell back to the grid any solar energy they don’t use. This helps offset their cost of power when the sun’s not shining. Like more than 40 other U.S. states, Nevada forces utilities to buy the excess energy at rates set by regulators—usually the same rate utilities charge (hence, the net in net metering). In Nevada, it’s worked well. So well, in fact, that NV Energy, the state’s largest utility, is fighting it with everything it’s got. ... In just a decade, solar has gone from an enviro’s dream to a serious lobby that will be fighting these kinds of battles nationwide for years. ... Power companies may not be winning any popularity contests, but they’re developing their own renewable energy to keep up with changing attitudes and to meet state mandates.