Upstream BESS
461.6 MW storage in Johnson, TX · In queue since March 2023 · Proposed COD May 2026
461.6 MW
Capacity
1
Components
Battery
3 years
In Queue
Facility Study
IA Status
COD target: 2026
Total Duration
3y 2m
Interconnection request submitted to ISO/RTO
ERCOT uses a serial "connect and manage" approach — fastest among major ISOs.
Typical: 18–30 months (fastest major ISO)
Interconnection agreement not yet executed
Typical: 30–60 days (negotiation)
Proposed COD: 2026-05-29
State
TX
County
Johnson
Region
ERCOT
Developer
Upstream Storage LLC
Utility
—
Entity
ERCOT
Point of Interconnection
1902 Johnson Switch
Data Source
LBNL
ROUNDUP: Texas BESS updates from SolarMax, Energy Vault, Engie, and Spearmint
A roundup of BESS projects from SolarMax, Energy Vault, Engie, and Spearmint in the Electric Reliability Council of Texas (ERCOT) market.
ROUNDUP: Texas BESS updates from SolarMax, Energy Vault, Engie, and Spearmint
A roundup of BESS projects from SolarMax, Energy Vault, Engie, and Spearmint in the Electric Reliability Council of Texas (ERCOT) market.
ROUNDUP: Texas BESS updates from SolarMax, Energy Vault, Engie, and Spearmint
A roundup of BESS projects from SolarMax, Energy Vault, Engie, and Spearmint in the Electric Reliability Council of Texas (ERCOT) market.
ROUNDUP: Texas BESS updates from SolarMax, Energy Vault, Engie, and Spearmint
A roundup of BESS projects from SolarMax, Energy Vault, Engie, and Spearmint in the Electric Reliability Council of Texas (ERCOT) market.
Last updated 2026-03-26