200 MW BESS testing in Pinal, AZ — Salt River Project
200 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
—
Operating Since
Coordinates
32.9192, -111.4989
County
Pinal, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Flatland Storage LLC | — | — |
| Owner(s) | Flatland Storage LLC | — | — |
| Status | Testing | — | — |
Flatland Storage is a 200 MW battery energy storage system located in Pinal County, Arizona. The facility, owned and operated by Flatland Storage LLC, utilizes batteries as its primary fuel source, designated by the code MWH. It consists of a single generator.
The plant operates within the Salt River Project balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. Flatland Storage ranks as the 33rd largest power plant in Arizona out of 47, and nationally it is ranked 313 out of 514.
Generated from EIA, GEM, and public data sources
NERC Region
WECC
Balancing Authority
Salt River Project
Grid Voltage
230 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
No generation data available for this plant.
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
View all articles