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189.9 MW Batteries (10 MW) + Solar Photovoltaic (180 MW) operating in Upton, TX — Electric Reliability Council of Texas, Inc.
189.9 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
2018
Operating Since
Coordinates
31.2625, -102.2795
County
Upton, TX
Nearby Plants
Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Upton County Solar 2 LLC | Vistra | — |
| Owner(s) | Upton County Solar 2 LLC | Vistra | — |
| Status | Operating | operating | — |
Castle Gap Solar Hybrid is a 189.9 MW hybrid power plant located in Upton County, Texas. The plant, which began operating in 2018, is owned by Vistra and operated by Upton County Solar 2 LLC. It utilizes both solar photovoltaic technology and battery energy storage. The facility consists of two generators and is fueled by energy from renewable sources (MWH). The solar component uses single-axis tracking. The battery energy storage system (BESS) has a capacity of 42 MWh, providing 4.24 hours of duration and using lithium-ion battery (LIB) chemistry.
The plant operates within the Electric Reliability Council of Texas (ERCOT) balancing authority. In the most recent year with available data, Castle Gap Solar Hybrid generated 384,210 MWh, achieving a capacity factor of 23.1%. Castle Gap Solar Hybrid is ranked as the 136th largest power plant in Texas out of 224, and 333rd nationally out of 514. Financial data is available for this plant from LBNL, though specific figures are not provided.
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
22.7K MWh
Latest Month
384.2K MWh
Annual Generation
23.1%
Capacity Factor
Data from 2018–2024
$22.8/MWh
Energy Value
Point of Interconnection
Nearest Substation
Upton County Solar 1 Substation · 138 kV
Substation Distance
0 km
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ERCOT
LMP Node
CASL_GAP_UN1
Pricing Hub
HB_WEST
Alt. Hub / Zone
LZ_WEST
Location Type
Resource Node
Node Source
Curated node match
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