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166 MW BESS operating in Owyhee, ID
166 MW
Nameplate Capacity
3
Generators
units
Batteries
Technology
2025
Operating Since
Coordinates
43.3515, -116.6609
County
Owyhee, ID
Nearby Plants
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Request a demo →| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Idaho Power Co | Idaho Power | — |
| Owner(s) | Idaho Power Co | IDACORP | — |
| Status | Operating | — | — |
Hemingway BESS is a battery energy storage system located in Owyhee County, Idaho. The plant has a total capacity of 166 MW and is comprised of 3 generators utilizing battery technology. It is owned by IDACORP and operated by Idaho Power Co. The plant began operating in 2025.
Hemingway BESS is the largest of 3 battery storage plants in Idaho, and ranks 362nd out of 514 such plants nationally. The facility has a storage duration of 4 hours. The plant operates within the Idaho Power Company balancing authority, and is located within the Western Electricity Coordinating Council (WECC) NERC region. The plant's primary fuel is listed as MWH, indicating it draws power from the grid to charge its batteries.
Generated from EIA, GEM, and public data sources
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
Idaho Power Company (IPCO)
Grid Voltage
34.5 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
−213 MWh
Net Charging
-6.5K MWh
Annual Net Energy
-0.5%
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: $225.9M
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
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