The Midcontinent Independent System Operator Inc. on Dec. 3 proposed revisions to facilitate deeper integration of energy storage resources across its region. The grid operator proposed a new electric storage resource category providing unique modeling, offer parameters, operating limitations, and settlement provisions that recognize the characteristics of energy storage resources.

MISO said that the filing enables participation of electric storage resources in its capacity, energy and ancillary services markets. The proposal is technology neutral covering all technologies storage mediums, including batteries, flywheels, compressed air and pumped-hydro.

The proposal follows the Federal Energy Regulatory Commission’s Feb. 15 order that requires grid operators to establish a participation model for electric storage resources.