Flatland Storage — Plant Summary
- EIA Plant ID
- 68529
- Capacity
- 200 MW
- Primary Fuel
- Battery Storage
- Technology
- Batteries
- Status
- Testing
- Location
- Pinal, AZ
- Operating Since
- —
- Generators
- 1
- Operator
- Flatland Storage LLC
- Parent Company
- —
- Balancing Authority
- Salt River Project
- ISO/RTO
- —
- NERC Region
- WECC
Flatland Storage
TestingBESS
Ranked #27 of 55 BESS plants in AZ#151 of 837 nationally
200 MW BESS testing in Pinal, AZ — Salt River Project
EIA
200 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
—
Operating Since
Location
Coordinates
32.9192, -111.4989
County
Pinal, AZ
Nearby Plants
- Coolidge Generation StationNatural Gas726 MW · 0.5 km
- Brittlebush SolarSolar200 MW · 1.1 km
- Homer Solar Energy CenterSolar90 MW · 3.1 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Flatland Storage LLC | — | — |
| Owner(s) | Flatland Storage LLC | — | — |
| Status | Testing | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
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
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
Salt River Project
Grid Voltage
230 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
No generation data available for this plant.
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.
News & Articles (10)Beta
Grid·capacity addition
Tesla Megapack project in Arizona: 200 MW of battery storage
The Flatland Energy Storage Project in Arizona uses Tesla's Megapack technology for 200 MW of battery storage. Find out how it is driving...
Tesla (other)
Shop4Tesla·1 years ago
Grid·capacity addition
Arizona Powers Ahead With 200 MW Tesla Battery Storage Project
Arizona is taking a significant step toward a sustainable energy future with the development of a 200 megawatt (MW) Tesla Battery Energy Storage System (BESS).
Tesla (other)
Drive Tesla Canada·1 years ago
General
Salt River Project and Flatland Storage plan 200-MW BESS in Arizona
The Flatland Energy Storage Project will be a 200-MW/800-MWh battery energy storage system located near Coolidge, Arizona.
Solar Power World·1 years ago
Grid·capacity addition
Arizona is getting 200 MW of Tesla battery storage to meet rising energy demand
Arizona's grid is getting a huge 200 MW Tesla lithium-ion battery energy storage system to support the state's growing energy demand.
Tesla (other)
Electrek·1 years ago
Last updated 2026-03-26
View all 10 articles