DTE Electric wants MISO to update storage tariffs, rules

As energy storage comes online in wholesale markets, grid operators are being tasked with rethinking market rules and structures designed for older technologies—and which may harm newer types of resources.

DTE Electric and Indianapolis Power & Light are two utilities pushing FERC and MISO to examine storage tariffs, saying the grid operator’s rules are insufficient and require revision.

IPL’s 20 MW, 20 MWh Harding Street storage facility went into service last year, but there is no regulatory path for IPL to get paid. The company says current market design means that lithium-ion batteries wanting to participate in the MISO market would be forced to operate in a way that would degrade their batteries quicker than usual.

And while the Harding Street project was developed to participate in the organized ancillary services market for regulation, the battery “been placed administratively behind the meter because current market mechanisms – designed only for synchronous generators – severely diminish the benefits to all customers on the grid by directing the device to slow down to mimic synchronous generators.”
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