200 MW BESS operating in Pima, AZ — Tucson Electric Power Company
200 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2025
Operating Since
Coordinates
32.0718, -110.8162
County
Pima, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Tucson Electric Power Co | Tucson Electric Power | — |
| Owner(s) | Tucson Electric Power Co | Fortis | — |
| Status | Operating | — | — |
Roadrunner Reserve Phase 1 is a 200 MW battery energy storage system (BESS) located in Pima County, Arizona. The plant, identified by plant ID 67905, began operating in 2025. It consists of a single generator utilizing battery technology with a duration of 4 hours. Tucson Electric Power Company operates the facility, while the parent company is Fortis, a Canadian firm.
The plant's primary fuel source is electricity (MWH). Roadrunner Reserve Phase 1 operates within the Tucson Electric Power Company balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. It is ranked as the 35th largest power plant in Arizona out of 47, and nationally it is ranked 322 out of 514.
Generated from EIA, GEM, and public data sources
NERC Region
WECC
Balancing Authority
Tucson Electric Power Company
Grid Voltage
138 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
−4.2K MWh
Net Charging
-20.8K MWh
Annual Net Energy
-2.4%
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.
No financial data available for this plant.
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
Last updated 2026-03-26
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