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500 MW Batteries (250 MW) + Solar Photovoltaic (250 MW) planned in Placer, CA — California Independent System Operator
500 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
Planned: —
Planned Operation
Coordinates
35.7549, -121.4071
County
Placer, CA
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Vesper Energy Development LLC | — | — |
| Owner(s) | Vesper Energy Development LLC | — | — |
| Status | Planned | announced | — |
Athens Solar I (Hybrid) is a 500 MW hybrid power plant located in Placer County, California. The facility, which combines solar photovoltaic generation with battery storage, is owned and operated by Vesper Energy Development LLC. It interconnects to the grid within the California Independent System Operator (CAISO) balancing authority, part of the Western Electricity Coordinating Council (WECC) NERC region. The plant utilizes fixed-tilt solar tracking technology.
The plant's primary fuel source is electricity (MWH), reflecting its hybrid nature. Athens Solar I (Hybrid) consists of two generators utilizing both solar photovoltaic and battery technologies. In terms of capacity, Athens Solar I (Hybrid) ranks as the 9th largest solar facility out of 112 in California and 63rd nationally out of 514.
Generated from EIA, GEM, and public data sources
ISO/RTO
CAISO
Market
ISO/RTO Member
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
No generation data available for this plant.
2023
$1,544/kW
Est. Construction Cost
Total estimated cost: $772.0M
Market Position
ISO/RTO Market
CAISO
LMP Node
—
Pricing Hub
TH_ZP26_GEN-APND
Node Source
Plant coordinates only
Last updated 2026-03-26
View all articlesCalifornia Independent System Operator (CISO)
Grid Voltage
230.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP