MISO to revise market tariffs to allow full participation of energy storage
Federal regulators continue to explore how electric storage can participate in wholesale markets, and have directed the Midcontinent ISO to file tariff changes. The commission denied IPL’s petition on two of three points, also declining to find the grid operator’s tariff unjust and unreasonable with respect to the current dispatch protocols for regulation service.
But FERC did say the tariff “unnecessarily restricts competition” by preventing storage from providing all the services that they are technically capable of providing. The order calls in the grid operator to explore the participation of all forms of storage, “regardless of the technology, in all MISO markets that they are technically capable of participating in, taking into account their unique physical and operational characteristics.”
IPL filed its complaint in October, complaining the MISO tariff was unjust in how it treated storage, in particular
the utility’s grid-scale lithium ion Harding Street Station Battery Energy Storage System. The 20 MW, 20 MWh project went into service in May, but the company has complained that while the batteries are valuable, there is no regulatory path for IPL to get paid.