"More Americans are installing rooftop solar and buying less electricity from their utilities"
If you ask the people who run America's electric utilities what keeps them up at night, a surprising number will say solar power. Specifically, rooftop solar.
That seems bizarre at first. Solar power provides just 0.4 percent of electricity in the United States — a minuscule amount. Why would anyone care?
But utilities see things differently. As solar technology gets dramatically cheaper, tens of thousands of Americans are putting photovoltaic panels up on their roofs, generating their own power. At the same time, 43 states and Washington DC have "net metering" laws that allow solar-powered households to sell their excess electricity back to the grid at retail prices.