In Bloomberg Businessweek, Noah Buhayar recently wrote about the differing agendas of Warren Buffett and Elon Musk pertaining to the solar energy market.
Musk owns SolarCity (and Tesla); Buffett's company owns NV Energy, a major utility in Nevada. They disagree about how much net-metering should be 'subsidized' in the state of Nevada.
Buffett's company owns 7% of the country’s wind generation and 6% of its solar generation.