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200 MW BESS operating in Maricopa, AZ — Arizona Public Service Company
200 MW
Nameplate Capacity
2
Generators
units
Batteries
Technology
2024
Operating Since
Coordinates
33.7131, -112.3242
County
Maricopa, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | AES Clean Energy | — | — |
| Owner(s) | AES Clean Energy | — | — |
| Status | Operating | — | — |
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
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
−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.
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 2026-03-14
View all articlesNo ask pi reports yet for this entity.
ask pi about WestwingArizona Public Service Company (AZPS)
Grid Voltage
230.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP