SPP-GEN-2026-SR11
258 MW storage in Mill Creek, OK · In queue since January 2026
258 MW
Capacity
0
Components
4 months
In Queue
—
IA Status
Total Duration
4 months
Interconnection request submitted to ISO/RTO
SPP uses the Definitive Interconnection System Impact Study (DISIS) cluster process.
Typical: 36–48 months (improving)
Interconnection agreement not yet executed
Typical: 30–60 days (negotiation)
Commercial operation date not yet determined
SPP-GEN-2026-SR11 is a proposed 258 MW battery storage project located in Mill Creek County, Oklahoma. The project is in the Southwest Power Pool (SPP) interconnection queue, with an entry date of January 26, 2026. The designated point of interconnection (POI) is the Johnson County 345kV Substation.
The project's service type is listed as ER/NR, and it is currently in active status within the SPP queue. Oklahoma Gas & Electric (OGE) is the utility associated with the project.
Generated from interconnection queue and public data sources
State
OK
County
Mill Creek
Grid Region
SPP (Southwest Power Pool)
Market
ISO/RTO Member
Developer
—
Utility
OGE
Entity
SPP
Service Type
ER/NR
Point of Interconnection
Johnson County 345kV Substation
Data Source
Live · SPP
- ISO / RTO
- SPP
- Trading Hub
- SPP South Hub
- Hub Confidence
- MEDIUM
This project's market context is estimated from its Point of Interconnection. Hub and node assignments are approximate and based on geographic inference from the POI substation name.
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