Millsing BESS
501.6 MW storage in Grimes, TX · In queue since February 2024 · Proposed COD October 2028
501.6 MW
Capacity
1
Components
Battery
2y 3m
In Queue
Facility Study
IA Status
COD target: 2028
Total Duration
4y 8m
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: 2028-10-15
The Millsing BESS project is a proposed 501.6 MW battery storage project located in Grimes County, Texas. The developer is listed as Millsing BESS. It is currently in the ERCOT interconnection queue as entry ERCOT-27INR0190, with a queue entry date of February 27, 2024, and a proposed commercial operation date of October 15, 2028. The project's interconnection agreement status is currently in the Facility Study phase.
The proposed project consists of 501.6 MW of battery storage capacity. The point of interconnection is the 44645 CNP Singleton 345kV substation. The Millsing BESS project has been mentioned in recent news coverage.
Generated from interconnection queue and public data sources
State
TX
County
Grimes
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Millsing BESS
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
44645 CNP Singleton 345kV
Data Source
LBNL + Live
- ISO / RTO
- ERCOT
- Trading Hub
- HB_SOUTH
- Hub Confidence
- MEDIUM
- Nearest Node (Estimated)
- LMO_ESR_RN
- POI Substation
- Singleton Substation
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.
Last updated 2026-03-26
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