The Trump administration's moves threaten $121 billion in new solar and wind power, two energy sources that are the biggest contributors to new capacity in the U.S.

Base Power is skipping the PJM's troubled interconnection queue by placing its batteries at people's homes, offering backup services in exchange.

While there was probably a moment when Slate’s leadership had to green-light the switch from one battery type to another, the momentum toward that decision had been building for years.