Westwing — Plant Summary
- EIA Plant ID
- 67855
- Capacity
- 200 MW
- Primary Fuel
- Battery Storage
- Technology
- Batteries
- Status
- Operating
- Location
- Maricopa, AZ
- Operating Since
- 2024
- Generators
- 2
- Operator
- AES Clean Energy
- Parent Company
- —
- Annual Generation
- -21,745 MWh
- Capacity Factor
- -1.2%
- Balancing Authority
- Arizona Public Service Company
- ISO/RTO
- —
- NERC Region
- WECC
Westwing
OperatingBESS
Ranked #31 of 55 BESS plants in AZ#181 of 837 nationally
200 MW BESS operating in Maricopa, AZ — Arizona Public Service Company
EIA
200 MW
Nameplate Capacity
2
Generators
units
Batteries
Technology
2024
Operating Since
Location
Coordinates
33.7131, -112.3242
County
Maricopa, AZ
Nearby Plants
- Beehive Energy StorageBESS250 MW · 10.8 km
- Lake Pleasant WTPSolar6.5 MW · 14.0 km
- Northwest RegionalLandfill Gas3.2 MW · 14.5 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | AES Clean Energy | — | — |
| Owner(s) | AES Clean Energy | — | — |
| Status | Operating | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
Westwing is a 200 MW battery energy storage system (BESS) located in Maricopa County, Arizona. The plant began operating in 2024 and is owned and operated by AES Clean Energy. The facility utilizes batteries as its primary fuel source (designated as 'MWH' in some datasets) and consists of two generators. The BESS has a duration of 4.08 hours.
Westwing operates within the Arizona Public Service Company balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. It is ranked as the 37th largest power plant out of 47 in Arizona, and 299th nationally out of 514. The plant's operation has been noted in at least two news articles, both of which focus on grid-related aspects.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
Arizona Public Service Company
Grid Voltage
230 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Interconnection Queue1 projectBeta
WithdrawnBattery200 MWWestLBNL
Generation
−2.2K MWh
Net Charging
-21.7K MWh
Annual Net Energy
-1.2%
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 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 (5)Beta
General
Charging Up: Meet Mitalee Gupta, director of commercial operations at LS Energy Solutions
Plus, climatetech career moves at AES Clean Energy, NREL, Longroad, Generate, Sila Nano and more.
Canary Media·3 years ago
Grid·outage
APS, TEP ask customers to cut power use until 8 p.m. to avoid possible blackouts
Arizona Public Service Co. and Tucson Electric Power asked customers to reduce how much electricity they use from 3-8 p.m. to prevent...
Arizona Public Service Co. (operator)APS (operator)
The Arizona Republic·5 years ago
Grid·outage
APS gets first of replacement transformers
The first of seven replacement transformers has arrived at the Westwing substation northwest of Phoenix, the site of a disastrous fire last July 4 that...
APS (operator)
East Valley Tribune·6 years ago
General
Fire out; residents still urged to conserve power
PHOENIX -- Fires at an electric substation in western Maricopa County burned themselves out, officials said Tuesday.
East Valley Tribune·14 years ago
Last updated 2026-03-26
View all 5 articles