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12 MW Batteries (10 MW) + Solar Photovoltaic (2 MW) operating in Pima, AZ — Tucson Electric Power Company
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
| 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
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.
Big Sky Wind, LLC · Data from 2018–2025
$65.2/MWh
PPA Price
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-03-26
View all articlesNo ask pi reports yet for this entity.
ask pi about Iron Horse Battery Storage HybridTucson Electric Power Company (TEPC)
Grid Voltage
13.8 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP