Mallard BESS
257.3 MW storage in Collin, TX · In queue since June 2022 · Proposed COD July 2026
257.3 MW
Capacity
1
Components
Battery
3y 11m
In Queue
Facility Study
IA Status
COD target: 2026
Total Duration
4y 1m
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: 2026-07-14
The Mallard BESS project is a proposed 257.3 MW battery storage project located in Collin County, Texas. Developed by Mallard Energy Storage LLC, the project is interconnected within the ERCOT region and entered the ERCOT interconnection queue as entry 25INR0101 on June 2, 2022. The proposed commercial operation date is July 14, 2026, and the project's interconnection agreement status is currently in the Facility Study phase.
The project consists of 257.3 MW of battery storage capacity. The point of interconnection is the 818 Olinger 138kV substation. The Mallard BESS project is currently listed as active within the ERCOT interconnection queue.
Generated from interconnection queue and public data sources
State
TX
County
Collin
Grid Region
ERCOT (Texas)
Market
ISO/RTO Member
Developer
Mallard Energy Storage LLC
Utility
—
Entity
ERCOT
Service Type
—
Point of Interconnection
818 Olinger 138kV
Data Source
LBNL + Live
- ISO / RTO
- ERCOT
- Trading Hub
- HB_NORTH
- Hub Confidence
- LOW
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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