On April 13, 2017 the Energy Storage Association (“ESA”) filed a complaint with FERC, alleging that PJM Interconnection, L.L.C. (“PJM”) had unilaterally implemented a series of changes to its Regulation market without FERC’s review and approval, in violation of the Federal Power Act (“FPA”). ESA contended that its members who participate in the Regulation market had “suffered significant and detrimental financial harm” as a result of PJM’s changes, and that ESA was filing its complaint “to compel PJM to give the Commission the opportunity to determine whether each of these changes are just and reasonable and not unduly discriminatory.”