Pima Energy Storage System — Plant Summary
- EIA Plant ID
- 61197
- Capacity
- 10 MW
- Primary Fuel
- Battery Storage
- Technology
- Batteries
- Status
- Operating
- Location
- Pima, AZ
- Operating Since
- 2017
- Generators
- 1
- Operator
- Pima Energy Storage System
- Parent Company
- —
- Annual Generation
- -584 MWh
- Capacity Factor
- -0.7%
- Balancing Authority
- Tucson Electric Power Company
- ISO/RTO
- —
- NERC Region
- WECC
Pima Energy Storage System
OperatingBESS
Ranked #55 of 55 BESS plants in AZ#566 of 837 nationally
10 MW BESS operating in Pima, AZ — Tucson Electric Power Company
EIAWD
10 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2017
Operating Since
Location
Coordinates
32.2515, -110.9914
County
Pima, AZ
Nearby Plants
- Demoss PetrieNatural Gas85 MW · 0.1 km
- Amphitheater High School SolarSolar1 MW · 2.6 km
- Cogeneration 2Natural Gas5.5 MW · 4.2 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Pima Energy Storage System | — | — |
| Owner(s) | Pima Energy Storage System | — | — |
| Status | Operating | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
The Pima Energy Storage System is a 10 MW battery energy storage system (BESS) located in Pima County, Arizona. The facility began operating in 2017 and utilizes lithium-ion battery chemistry (LIB). It consists of a single generator and has a total storage capacity of 10 MWh, providing a duration of 1 hour at full output. The plant's primary fuel is listed as 'MWH', indicating it draws power from the grid to charge its batteries.
Pima Energy Storage System is owned and operated by Pima Energy Storage System. The facility is located within the Western Electricity Coordinating Council (WECC) NERC region and is under the balancing authority of Tucson Electric Power Company. According to state rankings, the plant is the 67th largest out of 68 power plants in Arizona. Nationally, it ranks as the 785th largest out of 1205 power plants.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
Tucson Electric Power Company
Grid Voltage
13.8 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
−46 MWh
Net Charging
-584 MWh
Annual Net Energy
-0.7%
Capacity Factor
Jan 2023 – Dec 2025
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
No financial data available for this plant.
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
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