Papago Energy Storage

OperatingBESS

Ranked #22 of 58 BESS plants in AZ#103 of 963 nationally

300 MW BESS operating in Maricopa, AZ — Arizona Public Service Company

EIA

300 MW

Nameplate Capacity

Generators

unit

Batteries

Technology

2025

Operating Since

Location

Coordinates

33.4836, -113.0378

County

Maricopa, AZ

Nearby Plants

Papago PV
Solar150 MW · 0.4 km
Desert Sand BESS
BESS600 MW · 2.0 km
Harquahala Generating Project
Natural Gas1277.1 MW · 7.1 km

Status

Project statusOperationalPOWER Magazine · 2025-07-08

Latest milestoneCOD achievedSolarQuarter · 2025-07-09

Expected CODQ2 2025pv magazine USA · 2023-08-17

Ownership & Operator

Field	EIA	GEM	Wikidata
Operator	RE Papago LLC	—	—
Owner(s)	RE Papago LLC	—	—
Status	Operating	—	—

Ownership Chain

No GEM tracker match for this plant — ownership chain unavailable.

DeveloperRecurrent EnergySolarQuarter · 2025-07-09

About

Papago Energy Storage is a 300 MW battery energy storage system (BESS) located in Maricopa County, Arizona. The facility, owned and operated by RE Papago LLC, commenced operations in 2025. It utilizes batteries as its primary fuel source, designated by the code "MWH," and consists of a single generator. The BESS has a duration of 4 hours.

The plant operates within the Arizona Public Service Company balancing authority and is part of the Western Electricity Coordinating Council (WECC) NERC region. Papago Energy Storage is ranked as the 24th largest power plant in Arizona out of 47, and nationally it holds the 166th position out of 514 plants.

Generated from EIA, GEM, and public data sources

EIA Plant Profile

Engineering & Generators

EPC contractore-Storagepv magazine USA · 2023-08-17

Grid Context

Grid Region

Mountain West

Market

WEIM Participant

NERC Region

WECC — Western Electricity Coordinating Council

Balancing Authority

Generation

0 MWh

Net Discharge

0 MWh

Annual Net Energy

0.0%

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

EIA Avg CostEIA Construction Cost AveragesMEDIUM

2023

Construction CostOperating CostPricing & Revenue

$1,361/kW

Est. Construction Cost

Total estimated cost: $408.3M

Technology Average·Based on EIA averages — not plant-specific financial reports

Pricing & Market Data

This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.

News & Articles (5)Beta