Roadrunner Reserve Phase 1

OperatingBESS

Ranked #30 of 58 BESS plants in AZ#160 of 963 nationally

200 MW BESS operating in Pima, AZ — Tucson Electric Power Company

EIA

200 MW

Nameplate Capacity

Generators

unit

Batteries

Technology

2025

Operating Since

Location

Coordinates

32.0718, -110.8162

County

Pima, AZ

Nearby Plants

UASTP I
Solar1.2 MW · 3.1 km
Tech Park Solar
Solar5 MW · 3.3 km
Cogenra - TEP
Solar1 MW · 3.4 km

Status

Latest milestoneribbon-cuttingArizona Daily Star · 2025-11-06

Expected COD2025-06pv magazine USA · 2023-10-30

Ownership & Operator

Field	EIA	GEM	Wikidata
Operator	Tucson Electric Power Co	Tucson Electric Power	—
Owner(s)	Tucson Electric Power Co	Fortis	—
Status	Operating	—	—

Ownership Chain

DeveloperTucson Electric PowerArizona Daily Star · 2025-11-06

About

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

EIA Plant Profile

Engineering & Generators

EPC contractorDEPCOM Powerpv magazine USA · 2023-10-30

Grid Context

Grid Region

Mountain West

Market

WEIM Participant

NERC Region

WECC — Western Electricity Coordinating Council

Balancing Authority

Generation

−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.

Financial Data

EIA Avg CostEIA Construction Cost AveragesMEDIUM

2023

Construction CostOperating CostPricing & Revenue

$1,361/kW

Est. Construction Cost

Total estimated cost: $272.2M

Technology Average·Based on EIA averages — not plant-specific financial reports

Pricing & Market Data

This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.

News & Articles (2)Beta