Data last collected:
PowerPlantFactsEvidence report · prepared 19 October 2026https://powerplantfacts.com/entity/2193
EIA plant 2193
Great Falls · Cascade · MT
Rainbow (MT)
Operated by NorthWestern Energy (MT Hydro)
Published location
Where is Rainbow (MT)?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
47.534400, -111.204500
Open the interactive map ↗Map data © OpenStreetMap contributors
Capacity is not generation. Nameplate MW describes equipment; annual MWh describes recorded output. Proposed and retired units are not added to operating capacity.
Equipment mix
Operating capacity by technology
Grouped from this plant’s represented generator records. Use the MT plant index for regional peers.
See the evidence
Electricity output across the year
Monthly net generation shows the seasonal shape of this plant's represented output. A negative value is retained when the source reports net consumption.
132,864
230,238
329,588
415,265
534,075
639,950
722,926
827,644
926,588
1023,744
1122,842
1223,243
MWh net generation · 2024 final edition · EIA 923 represented operating rows. 12 of 12 supplied rows shown; 0 missing values omitted. Months with no reported numeric value are omitted, not treated as zero.
Read the chart as a table
| Record | MWh net generation |
|---|---|
| 1 | 32,864 |
| 2 | 30,238 |
| 3 | 29,588 |
| 4 | 15,265 |
| 5 | 34,075 |
| 6 | 39,950 |
| 7 | 22,926 |
| 8 | 27,644 |
| 9 | 26,588 |
| 10 | 23,744 |
| 11 | 22,842 |
| 12 | 23,243 |
2024 monthly net generation
| Month | Net generation |
|---|---|
| 1 | 32,864 MWh |
| 2 | 30,238 MWh |
| 3 | 29,588 MWh |
| 4 | 15,265 MWh |
| 5 | 34,075 MWh |
| 6 | 39,950 MWh |
| 7 | 22,926 MWh |
| 8 | 27,644 MWh |
| 9 | 26,588 MWh |
| 10 | 23,744 MWh |
| 11 | 22,842 MWh |
| 12 | 23,243 MWh |
Operating generators
| ID | Technology | Fuel | MW | Status |
|---|---|---|---|---|
| RAI9 | Conventional Hydroelectric | WAT | 59 | OP |
Continue exploring
Similar-capacity plants in the same state
Identity, technology and limitations
EIA plant ID
2193
Sector
Electric Utility
Water source
Missouri River
Data edition
2024-final
Use this record
Questions this evidence can answer
01What exactly is this record?
Use the name, place, date and identifiers above to confirm that you have the right Rainbow (MT) power plant: capacity and generation | PowerPlantFacts record.
02What does the evidence establish?
Read the reported values with their units, coverage dates and source notes. Keep observed facts separate from estimates or interpretation.
03What should I verify next?
Follow the primary-source links and check the limitations before using this evidence for a decision, comparison or citation.
A closer look at Rainbow (MT)
Variation in the published months
Across 12 numeric monthly generation entries, 6 has the highest recorded value (39,950 MWh) and 4 the lowest (15,265 MWh). Their difference is 24,685 MWh. Missing months have not been treated as zero.
Generator capacity in different operating conditions
| Generator ID | Technology | Nameplate MW | Summer MW | Winter MW | Minimum load MW |
|---|---|---|---|---|---|
| RAI9 | Conventional Hydroelectric | 59.0 | 64.0 | 64.0 | 1.0 |
EIA-860 2024 final source. Ratings describe capacity, not actual generation or availability. Missing ratings are not zero.
Source: US Energy Information Administration Form EIA-860 2024 plant and operable-generator workbooks; archive 2024. US EIA-authored information is generally public domain; cite EIA, preserve third-party exceptions, changes and no-endorsement context. Source-specific derived data.