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12 MW Batteries (10 MW) + Solar Photovoltaic (2 MW) operating in Pima, AZ
12 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
2017
Operating Since
Coordinates
32.1033, -110.8220
County
Pima, AZ
Nearby Plants
Forward-looking, asset-specific exposure analytics combining climate hazards, generation variability, and counterparty risk into a single decision-grade view. Powered by InfraRisk.
See the full risk decomposition + scenarios for this asset.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | RWE Clean Energy | RWE Renewables Americas | — |
| Owner(s) | Big Sky Wind, LLC | — | — |
| Status | Operating | operating | — |
The Iron Horse Battery Storage Hybrid is a 12 MW hybrid power plant located in Pima County, Arizona. The plant, which began operating in 2017, is owned and operated by Big Sky Wind, LLC. It utilizes both battery storage and solar photovoltaic technologies. The battery energy storage system (BESS) has a storage capacity of 2.5 MWh and a duration of 0.25 hours, employing lithium-ion battery chemistry (LIB). The solar array uses a fixed-tilt tracking system. The plant's balancing authority is Tucson Electric Power Company, and it operates within the Western Electricity Coordinating Council (WECC) NERC region.
In its latest year of operation, the Iron Horse Battery Storage Hybrid generated 4,650 MWh, resulting in a capacity factor of 4.4%. The plant ranks 66th out of 68 power plants in Arizona and 723rd out of 1205 nationally. Financial data indicates a power purchase agreement (PPA) price of $65.2 per MWh, as reported to FERC.
Generated from EIA, GEM, and public data sources
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
Tucson Electric Power Company (TEPC)
Grid Voltage
13.8 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.
352 MWh
Net Discharge
4.7K MWh
Annual Net Energy
4.4%
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.
Forward-looking generation outlook with probabilistic ranges across weather, demand, and policy scenarios. Powered by InfraSure's generation modeling stack.
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Historic financial signal for this asset — PPA, LCOE, market value where reported. The base for forward bankability and insurance analytics on the InfraSure platform.
Big Sky Wind, LLC · Data from 2018–2025
$65.2/MWh
PPA Price
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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This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
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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