by Jeff St. John
January 14, 2016

The U.S. energy storage sector may be booming, but it’s still far from mature. Developers of grid-scale battery projects remain dependent on a handful of markets that offer the right economics and incentives. And when one of those key markets undergoes a significant change in how it values energy storage, that can lead to some outsized impacts to short-term growth.

In the past few months, we’ve seen just this kind of thing happen with mid-Atlantic grid operator PJM and its frequency regulation market. Over the past few years, many of the...