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10 MW BESS operating in Starr, TX
10 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2023
Operating Since
Coordinates
26.3910, -98.8203
County
Starr, TX
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | SMT Rio Grande II LLC | — | — |
| Owner(s) | SMT Rio Grande II LLC | — | — |
| Status | Operating | — | — |
SMT Rio Grande II LLC is a battery energy storage system (BESS) located in Starr County, Texas. The plant, owned and operated by SMT Rio Grande II LLC, has a total capacity of 10 MW. It began operating in 2023 and utilizes lithium-ion batteries (LIB) as its storage chemistry. The facility consists of a single generator and has a total storage capacity of 10 MWh, providing a duration of 1 hour at full power.
The plant operates within the Electric Reliability Council of Texas (ERCOT) balancing authority and the Texas Reliability Entity (TRE) NERC region. SMT Rio Grande II LLC is ranked as the 247th largest power plant in Texas out of 313 facilities, and nationally it is ranked 757th out of 1205 plants. The plant's primary fuel source is listed as MWH, indicating that it draws power from the grid to charge its batteries.
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
12.47 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
−24 MWh
Net Charging
-357 MWh
Annual Net Energy
-0.4%
Capacity Factor
Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.
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2023
$1,361/kW
Est. Construction Cost
Total estimated cost: $13.6M
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Point of Interconnection
Nearest Substation
Rio Grande City 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
Shared substation inference
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.
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