Rattlesnake Ridge Battery Storage — Plant Summary
- EIA Plant ID
- 67300
- Capacity
- 11.8 MW
- Primary Fuel
- Battery Storage
- Technology
- Batteries
- Status
- Operating
- Location
- Weld, CO
- Operating Since
- 2024
- Generators
- 1
- Operator
- United Power, Inc
- Parent Company
- Ameresco
- Annual Generation
- -1,032 MWh
- Capacity Factor
- -1.0%
- Balancing Authority
- Western Area Power Administration - Rocky Mountain Region
- ISO/RTO
- —
- NERC Region
- WECC
Rattlesnake Ridge Battery Storage
OperatingBESS
Ranked #6 of 15 BESS plants in CO#504 of 837 nationally
11.8 MW BESS operating in Weld, CO — Western Area Power Administration - Rocky Mountain Region
EIA
11.8 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2024
Operating Since
Location
Coordinates
40.1974, -104.6080
County
Weld, CO
Nearby Plants
- SR Platte Solar FarmSolar16 MW · 7.2 km
- Mountain Peak Power StationNatural Gas162.6 MW · 7.5 km
- Keenesburg Battery StorageBESS11.8 MW · 7.6 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | United Power, Inc | Ameresco | — |
| Owner(s) | Ameresco | Ameresco | — |
| Status | Operating | — | — |
Ownership Chain
About
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
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
Western Area Power Administration - Rocky Mountain Region
Grid Voltage
13.2 kV
Regulatory Status
RE
Entity Type
Cooperative
Sector
Electric Utility
Generation
−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.
Financial Data
No financial data available for this plant.
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
News & Articles (10)Beta
Industry·corporate
Why data centers will need a ‘bring your own power’ strategy
If the AI boom is not handled correctly, we will put grid stability and public trust at odds with tech-led growth, writes Ameresco CEO George Sakellaris.
Ameresco (operator)George Sakellaris (executive)
Utility Dive·6 days ago
General
Nucor Kingman Mill Installs 50MW/200 MWh Battery Energy Storage System Developed by Ameresco
Nucor Corporation (NYSE:NUE) is one of the best infrastructure stocks to buy with huge upside. On October 17, Ameresco Inc. (NYSE:AMRC)...
Yahoo Finance·5 months ago
General
Arizona industrial steel manufacturer to power electric arc furnace with solar and storage
Steel producer Nucor tapped Ameresco for a 50 MW / 200 MWh battery energy storage system to stabilize its electricity demand.
pv magazine USA·5 months ago
General
Ameresco, Alliant Energy, begin operating record-breaking BESS projects in Arizona, Wisconsin
Ameresco has put Arizona's largest behind-the-meter battery energy storage system (BESS) into operation, meanwhile Alliant Energy has begun...
Energy-Storage.News·5 months ago
Last updated 2026-03-21
View all 10 articles