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Storage technologies provide flexible resources in the market

Electricity storage has the potential to provide significant flexibility in balancing the grid. The ISO has two resource models that provide opportunities for storage technologies to participate in the wholesale ancillary services market and energy market: pump storage and non-generator resource.


Non-Generator Resources (NGR) have the capability to serve as both generation and load and can be dispatched to any operating level within their entire capacity range.

Pump Storage resources act as load while using energy to pump water to higher elevation reservoirs, and then act like generators by creating energy when releasing water back to lower reservoirs.


Process and requirements

Participation in the ISO market requires a scheduling coordinator and ISO-certified revenue-quality meters. Bidding in ancillary services requires special certification and installation of direct telemetry. There are also requirements specific to each type of demand participation.

Market participants who wish to introduce storage resources can initiate the California ISO interconnection process through the Resource Interconnection Guide.