Utility Dive reported that the FERC commission unanimously directed grid operators to develop rules for storage to participate in the wholesale energy, capacity and ancillary services markets.  

Order 841 directs operators of wholesale markets — Regional Transmission Organizations (RTOs) and Independent System Operators (ISOs) — to come up with market rules for energy storage to participate in the wholesale energy, capacity and ancillary services markets that recognize the physical and operational characteristics of the resource. They have months to file tariffs that comply with the order and another year to implement those tariff provisions.

FERC specifies that those rules must:

• Ensure that a storage resource can provide all the services it is technically capable of providing,
• Ensure that an energy storage resource can be dispatched and can set market clearing prices as both a buyer and a seller,
• Account for the physical and operational characteristics of storage resources through bidding parameters or other means,
• Establish a minimum size for participation in RTO/ISO markets that does not exceed 100 kW, and
• Specify that the sale of electricity from the RTO/ISO markets to a storage resource that the resource resells must be at the wholesale locational marginal price.