# Castle Gap Solar Hybrid

ERCOT asset profile · https://askthegrid.com/assets/facilities/castle-gap-solar-hybrid

Vistra Corp · Upton County · ERCOT

Castle Gap Solar Hybrid is a hybrid solar and battery storage facility with 189.9 MW of EIA-reported operating capacity in Upton County, Texas, registered as EIA Plant ID 60123. Upton County Solar 2 LLC is the registered plant entity or operator. Project filings list 485,000 solar panels and 90 inverters for the facility.

## Profile

- **Grid role:** Utility-scale solar generation in ERCOT's energy-only market.
- **Physical build:** Castle Gap Solar Hybrid (EIA 60123) — a two-unit solar + battery hybrid: solar generation ~189.9 MW AC (EIA record), DC net capacity reported 234 MW, single-axis tracking, crystalline silicon PV; approximately 485,000 PV modules reported in project summaries; 90 KACO BP 2200 TL3 solar inverters (2.0 MW each) specified in the interconnection agreement; on-site battery energy storage: 9.9 MW / 42 MWh (LIB) storage, enclosure type reported as 'CS' in storage details. Sources below provide the cited counts and electrical ratings; OEM module supplier is not identified in the available corpus, and no OEM product pages for installed equipment were found there.

## Metrics

- **Reported capacity:** 189.9 MW — EIA-reported operating capacity; nameplate, seasonal, AC/DC, and unit ratings may differ.
- **Technology:** Solar + battery storage — Primary generation technology.
- **Registry anchor:** Plant 60123 — Upton County Solar 2 LLC · Upton County · ERCOT
- **Operating status:** Operating — Castle Gap Solar Hybrid is operating.
- **Equipment:** 485,000 panels / 90 inverters — Installed equipment documented in public project records.
- **Resource stack:** 2 resources — CASL_GAP_ESR1 · CASL_GAP_UNIT1

## Facts

- **Reported capacity:** 189.9 MW — Batteries; Solar Photovoltaic. · confidence: high
- **Operating status:** operating — Castle Gap Solar Hybrid is operating. · confidence: medium
- **Location:** Upton County — ERCOT · confidence: high
- **Operator:** Upton County Solar 2 LLC · confidence: high
- **Asset role:** solar — ERCOT · Upton County

## Related parties

- **Operator:** Upton County Solar 2 LLC — Owner / developer associated with Castle Gap Solar Hybrid. ([source](https://upton-county-solar-2-llc.square.site/))

## Sources

- [Combo & Single Model ESR Names](https://www.ercot.com/files/docs/2025/02/14/single-model-esr-names.xlsx) — ercot.com · regulatory — Feb 14, 2025 — The Single Model Energy Strorage Resource Names. Model ESR Name = "Substation Code" CASL_GAP BATTERY1 CASL_GAP_LD1 ESR1 CASL_GAP_ESR1 45687
- [Forecasted Capacity](https://www.ercot.com/files/docs/2023/03/08/SARA_Spring2023.xlsx) — ercot.com · regulatory — Mar 8, 2023 — CASL_GAP_UNIT1 UPTON SOLAR. ERCOT used 90th percentile weather occurring at the time of the.
- [Upton County Solar 2, Llc: Home](https://upton-county-solar-2-llc.square.site/) — upton-county-solar-2-llc.square.site · other — Upton County Solar 2, Llc Shopping. Accepted here CashApp Apple Pay Google Pay Visa Mastercard American Express Discover JCB … © 2026 Powered by Square
- [Luminant Inks Deal With SunEdison To Bring More Solar...](https://seia.org/news/luminant-inks-deal-sunedison-bring-more-solar-power-texas-grid/) — seia.org · other — SunEdison's new 800-acre Castle Gap facility in Upton County, The complex will have 485,000 solar panels when it is completed next year.
- [Luminant Solar Project Expands Diverse Mix of Generation](https://www.prnewswire.com/news-releases/luminant-solar-project-expands-diverse-mix-of-generation-300138372.html) — prnewswire.com · other — Sep 8, 2015 — Luminant has agreed to buy 116 megawatts generated by a SunEdison large-scale solar plant in Upton County, Texas.

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Canonical page: https://askthegrid.com/assets/facilities/castle-gap-solar-hybrid
Website: [Vistra Corp](https://www.vistracorp.com/)
Profile published: 2026-07-17T03:34:07.120Z
Source: Ask the Grid — https://askthegrid.com/