Pluto Energy Storage — Plant Summary
- EIA Plant ID
- 67328
- Capacity
- 75 MW
- Primary Fuel
- Battery Storage
- Technology
- Batteries
- Status
- Operating
- Location
- Maricopa, AZ
- Operating Since
- 2025
- Generators
- 1
- Operator
- Pluto Energy Storage, LLC
- Parent Company
- —
- Annual Generation
- -12,164 MWh
- Capacity Factor
- -3.7%
- Balancing Authority
- Arizona Public Service Company
- ISO/RTO
- —
- NERC Region
- WECC
Pluto Energy Storage
OperatingBESS
Ranked #42 of 55 BESS plants in AZ#364 of 837 nationally
75 MW BESS operating in Maricopa, AZ — Arizona Public Service Company
EIA
75 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2025
Operating Since
Location
Coordinates
33.4096, -112.4116
County
Maricopa, AZ
Nearby Plants
- Macys GoodyearSolar3.1 MW · 0.3 km
- Estrella Mountain PVSolar1.8 MW · 6.6 km
- Sierra Estrella Energy StorageBESS250 MW · 9.1 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Pluto Energy Storage, LLC | — | — |
| Owner(s) | Pluto Energy Storage, LLC | — | — |
| Status | Operating | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
Pluto Energy Storage is a 75 MW battery energy storage system (BESS) located in Maricopa County, Arizona. The facility, which began operating in 2025, is owned and operated by Pluto Energy Storage, LLC. It consists of a single generator utilizing battery technology with a duration of 4 hours. The plant's primary fuel is listed as MWH, indicating it draws power from the grid to charge its batteries. Pluto Energy Storage ranks as the 51st largest power plant in Arizona out of 68, and 552nd nationally out of 1205 facilities.
The facility operates within the Arizona Public Service Company balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. Financial data indicates a power purchase agreement (PPA) price of $13.96 per MWh, as reported in FERC Electric Quarterly Reports (EQR).
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
Arizona Public Service Company
Grid Voltage
69 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
−1.4K MWh
Net Charging
-12.2K MWh
Annual Net Energy
-3.7%
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.
Financial DataBeta
Source: FERC Electric Quarterly ReportsMEDIUM
$14.0/MWh
PPA Price
Pluto Energy Storage, LLC
Contract Seller
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
News & Articles (3)Beta
Deals·other
Global Awards
SMBC had an impressive year across the globe with leading-edge bank and advisory deals across the Americas and EMEA regions.
SMBC (other)
www.pfie.com·1 years ago
Grid·capacity addition
SRP inaugurates 340MW/1,360MWh BESS assets ahead of Arizona summer peak challenges
Event celebrated two battery storage systems in the service area of Arizona utility SRP, including the state's largest project of its type.
SRP (operator)
Energy-Storage.News·1 years ago
Grid·capacity addition
Two new battery storage projects coming online in Arizona
When both facilities are operational, nearly 1300 MW of battery and pumped hydro storage will be on Salt River Project's system.
Salt River Project (operator)
Power Engineering·1 years ago
Last updated 2026-03-14
View all articles