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10 MW BESS operating in Pima, AZ — Tucson Electric Power Company
10 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2017
Operating Since
Coordinates
32.2515, -110.9914
County
Pima, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Pima Energy Storage System | — | — |
| Owner(s) | Pima Energy Storage System | — | — |
| Status | Operating | — | — |
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
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
−46 MWh
Net Charging
-584 MWh
Annual Net Energy
-0.7%
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.
2017
$1,587/kW
Est. Construction Cost
Total estimated cost: $15.9M
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-03-14
View all articlesNo ask pi reports yet for this entity.
ask pi about Pima Energy Storage SystemTucson Electric Power Company (TEPC)
Grid Voltage
13.8 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP