by Jeff St. John
December 15, 2015

Back in 2013, the California Public Utilities Commission set in motion a mandate that calls for the state’s big three investor-owned utilities to procure 1.3 gigawatts of energy storage by the end of the decade. Overnight, it transformed California into the world’s largest market opportunity for grid-scale and behind-the-meter batteries -- at least on paper.

But it also presented regulators and utilities with an unprecedented challenge -- setting up a regime to deploy relatively unproven technologies at megawatt scale, while building the...