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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
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
No generation data available for this plant.
2023
$1,361/kW
Est. Construction Cost
Total estimated cost: $272.2M
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-03-26
View all articlesNo ask pi reports yet for this entity.
ask pi about Flatland StorageSalt River Project (SRP)
Grid Voltage
230.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP