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11.8 MW BESS operating in Weld, CO — Western Area Power Administration - Rocky Mountain Region
11.8 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2024
Operating Since
Coordinates
40.1974, -104.6080
County
Weld, CO
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Rattlesnake Ridge Energy Storage LLC | Ameresco | — |
| Owner(s) | Ameresco | Ameresco | — |
| Status | Operating | — | — |
Rattlesnake Ridge Battery Storage is a battery energy storage system located in Weld County, Colorado. The plant, which began operating in 2024, has a total capacity of 11.8 MW and utilizes batteries as its primary fuel source, specifically lithium-ion batteries (LIB). The storage capacity of the battery system is 47 MWh, providing a duration of approximately 3.98 hours. It is owned by Ameresco and operated by United Power, Inc.
The facility consists of a single generator and operates within the Western Electricity Coordinating Council (WECC) NERC region. Its balancing authority is the Western Area Power Administration - Rocky Mountain Region. Rattlesnake Ridge Battery Storage is ranked as the 10th largest of 18 battery storage facilities in Colorado, and 728th nationally out of 1205 such facilities.
Generated from EIA, GEM, and public data sources
Grid Region
Mountain West
Market
Bilateral Market
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
Western Area Power Administration - Rocky Mountain Region (WACM)
Grid Voltage
13.2 kV
Regulatory Status
RE — Regulated
Entity Type
—
Sector
Electric Utility
−179 MWh
Net Charging
-1.0K MWh
Annual Net Energy
-1.0%
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.
2023
$1,361/kW
Est. Construction Cost
Total estimated cost: $16.1M
This plant is in a bilateral market territory without organized wholesale pricing. Nodal pricing data is not available.
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