Millennium Energy Storage
102.59 MW storage in Martin, TX · In queue since May 2023 · Proposed COD April 2027
102.59 MW
Capacity
1
Components
Battery
3 years
In Queue
Facility Study
IA Status
COD target: 2027
Total Duration
3y 11m
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: 2027-04-30
The Millennium Energy Storage project is a proposed 102.59 MW battery storage project in Martin County, Texas. Developed by Rocky Mountain Energy Development, LLC, the project entered the ERCOT interconnection queue as ERCOT-25INR0431 on May 3, 2023. Its proposed commercial operation date is April 30, 2027, and its interconnection status is currently in the Facility Study phase.
The development project consists of 102.59 MW of battery capacity. Recent news coverage indicates industry interest in the project.
Generated from interconnection queue and public data sources
State
TX
County
Martin
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Rocky Mountain Energy Development, LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
Tap 138kV 23837 Buffalo - 23839 Triangle
Data Source
LBNL
- ISO / RTO
- ERCOT
- Trading Hub
- HB_WEST
- Hub Confidence
- MEDIUM
- POI Substation
- Buffalo Gap 2 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.
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