1. Taking Aim at PJM’s 10-Hour Duration Capacity Rule for Energy Storage

    Taking Aim at PJM’s 10-Hour Duration Capacity Rule for Energy Storage

    The U.S. energy storage industry has been getting into arguments with grid operators over their plans to implement FERC Order 841, the mandate to integrate energy storage assets into the country’s wholesale energy markets. The biggest argument to date has been over PJM’s insistence on a 10-hour duration requirement for its capacity market. Last week, ESA and NRDC unveiled an analysis by Astrapé Consulting, using PJM data and industry-standard modeling, that indicates gigawatts' worth of energy storage in 2-hour, 4-hour and 6-hour durations could provide the same capacity value as power plants that run 24 hours a day.

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    1. The results of our analysis demonstrate that with energy storage deployments up to 4,000 MW, 4 hours of duration allows those resources to provide full capacity value relative to a resource without duration limits.
    2. This analysis is now before FERC, along with ESA's arguments that PJM is inappropriately trying to advance a rule that violates Order 841 and would contradict its own capacity market design that FERC previously approved.
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