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150 MW BESS operating in La Paz, AZ — California Independent System Operator
150 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2025
Operating Since
Coordinates
33.5829, -113.5769
County
La Paz, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Atlas IX LLC | — | — |
| Owner(s) | Atlas IX LLC | — | — |
| Status | Operating | — | — |
Atlas IX is a 150 MW battery energy storage system located in La Paz County, Arizona. The plant, identified by the EIA plant code 68324, is owned and operated by Atlas IX LLC. It consists of a single generator utilizing battery technology and is interconnected with the California Independent System Operator (CAISO) balancing authority within the Western Electricity Coordinating Council (WECC) region.
The plant's primary fuel source is electricity (MWH), which it uses to charge its batteries. Atlas IX is ranked as the 42nd largest power plant in Arizona out of 47, and nationally it is ranked 401st out of 514. Recent news coverage indicates three articles related to deals involving the plant.
Generated from EIA, GEM, and public data sources
ISO/RTO
CAISO
Market
ISO/RTO Member
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
−146 MWh
Net Charging
—
Annual Net Energy
—
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: $204.2M
Market Position
ISO/RTO Market
CAISO
LMP Node
—
Pricing Hub
TH_SP15_GEN-APND
Node Source
Plant coordinates only
No news articles linked yet for this plant.
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No ask pi reports yet for this entity.
ask pi about Atlas IXCalifornia Independent System Operator (CISO)
Grid Voltage
500.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP