In 2026 Q2, SPP saw eight batteries totaling 820 MW reach their stated commercial operation dates, lifting the battery fleet to 1.4 GW across 15 projects.

The region's 53 GW battery queue remains the third largest in the US. Meanwhile, the first transition cycle of SPP's Consolidated Planning Process (CPP) is now underway. The reform is reshaping how congested clusters from previous years move through the queue.

This report examines which batteries reached commercial operation, what the near-term pipeline holds, and what's driving the updated buildout projection through 2031.

Read last quarter’s report here.

Key takeaways

• 820 MW across eight projects reached their stated commercial operation dates in Q2 2026, the largest quarterly total in SPP's history, up from 252 MW in our previous update. Only the 36 MW Cunningham project has so far appeared in EIA-860M operational data.
• 1.3 GW of IA-agreed capacity targets commercial operation between Q3 2026 and Q1 2027, concentrated in Q4 2026. The 594 MW GREC replacement is the single largest project in the near-term pipeline.
• 65% of battery capacity in the queue is co-located. Solar co-location leads at 24.5 GW, followed by wind at 5.9 GW.
• Updated buildout projections reaches 21 GW by 2031. Completion rates are now measured from SPP's own queue history, then extended with Modo's economic capacity expansion forecast.

Eight projects raise SPP battery capacity by 820 MW

Eight battery projects with stated commercial operation dates in Q2 2026 total 820 MW.

​NextEra’s Hitchland (200 MW, Gruver, Texas) is the largest site added this quarter.