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100 MW BESS operating in Webb, TX
100 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2026
Operating Since
Coordinates
27.4561, -99.4173
County
Webb, TX
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Seven Flags BESS LLC | — | — |
| Owner(s) | Seven Flags BESS LLC | — | — |
| Status | Operating | — | — |
Seven Flags BESS LLC, plant ID 66689, is a 100 MW battery energy storage system (BESS) located in Webb County, Texas. The facility is owned and operated by Seven Flags BESS LLC. It consists of a single generator utilizing batteries as its primary fuel source, measured in MWh. The plant operates within the Electric Reliability Council of Texas, Inc. (ERCOT) balancing authority, falling under the TRE NERC region.
Seven Flags BESS LLC is ranked as the 217th largest plant in Texas out of 224, and nationally it is ranked 509th out of 514. Public information indicates that the plant has been the subject of 7 news articles, with 5 focusing on deals and 2 on industry-related topics.
Generated from EIA, GEM, and public data sources
ISO/RTO
ERCOT
Market
ISO/RTO Member
NERC Region
TRE — Texas Reliability Entity
Balancing Authority
Electric Reliability Council of Texas, Inc. (ERCO)
Grid Voltage
138.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
No generation data available for this plant.
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2023
$1,361/kW
Est. Construction Cost
Total estimated cost: $136.1M
Forward revenue, DSCR bands, and refinancing risk projected under price, demand, and policy scenarios. Powered by InfraSure's asset cashflow stack.
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Point of Interconnection
Nearest Substation
Wormser Road Substation · 138 kV
Substation Distance
< 10 km
Operator
American Electric Power
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ERCOT
LMP Node
—
Pricing Hub
HB_SOUTH
Node Source
OSM spatial match
Substation identified. Node ID not yet resolved against ISO roster.
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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