Average prices for capacity contracts in SPP have hovered between $3 and $5/kW-month for most of the past five years. New batteries in the RTO are clearing well above that range.

The first grid-scale batteries in SPP have secured $8-10/kW-month from capacity contracts, roughly twice the $4.7/kW market average.

Read on to find out how these bilateral contracts are forming the fixed-income foundation for new energy storage projects in SPP.

The first batteries in SPP are earning $8-10/kW in capacity revenue

Four of NextEra Energy’s storage projects came online in SPP in 2025 through the Surplus Queue. These projects are receiving monthly capacity payments from Oklahoma Municipal Utility, the Western Farmers Electric Cooperative, and Google.

Prices range from $7.98/kW-month for Breckinridge to $9.69/kW-month for Minco II. These batteries contract with Google Energy LLC, forming the beginning of NextEra’s partnership with the hyperscaler announced in December 2025.