"In California, there is so much solar energy that grid operators have to switch off solar farms. One solution of dealing with the additional power generated is to share the renewable wealth across state borders – but in the West, it's sparking some not-so-neighborly opposition.

Nancy Traweek's job is to balance California's electrical grid at the California Independent System Operator, keeping the lights on for 30 million people. She relies on huge natural gas power plants that put out a steady stream of electricity.

But lately, Traweek's job has gotten harder because of solar and wind power. If clouds come in, solar power drops off.

"That needs to come from somewhere else immediately," she says."

Lauren Sommer and Stephanie Joyce report for NPR's All Things Considered June 6, 2016. [2]