Data last collected:
PowerPlantFactsEvidence report · prepared 19 October 2026https://powerplantfacts.com/entity/539
EIA plant 539
New Milford · Litchfield · CT
Rocky River (CT)
Operated by FirstLight Power Resources Services LLC
Published location
Where is Rocky River (CT)?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
41.582600, -73.434900
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 CT 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.
13,172
25,126
3-3,203
4-2
5231
6239
7791
8151
953
10147
11-1,290
12-901
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 | 3,172 |
| 2 | 5,126 |
| 3 | -3,203 |
| 4 | -2 |
| 5 | 231 |
| 6 | 239 |
| 7 | 791 |
| 8 | 151 |
| 9 | 53 |
| 10 | 147 |
| 11 | -1,290 |
| 12 | -901 |
2024 monthly net generation
| Month | Net generation |
|---|---|
| 1 | 3,172 MWh |
| 2 | 5,126 MWh |
| 3 | -3,203 MWh |
| 4 | -2 MWh |
| 5 | 231 MWh |
| 6 | 239 MWh |
| 7 | 791 MWh |
| 8 | 151 MWh |
| 9 | 53 MWh |
| 10 | 147 MWh |
| 11 | -1,290 MWh |
| 12 | -901 MWh |
Operating generators
| ID | Technology | Fuel | MW | Status |
|---|---|---|---|---|
| 3 | Hydroelectric Pumped Storage | WAT | 24 | OP |
| 1 | Hydroelectric Pumped Storage | WAT | 3.5 | OP |
| 2 | Hydroelectric Pumped Storage | WAT | 3.5 | OP |
Continue exploring
Similar-capacity plants in the same state
Identity, technology and limitations
EIA plant ID
539
Sector
IPP Non-CHP
Water source
Housatonic 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 Rocky River (CT) 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 Rocky River (CT)
Variation in the published months
Across 8 numeric monthly generation entries, 2 has the highest recorded value (5,126 MWh) and 9 the lowest (53 MWh). Their difference is 5,073 MWh. Missing months have not been treated as zero.
Reading the MW column
In the 3 numeric rows displayed in this table, MW ranges from 3.5 (1, 2) to 24 (3). The difference is 20.5 in the column's stated units. This summary covers the displayed rows and retains the table's period and scope.
Generator capacity in different operating conditions
| Generator ID | Technology | Nameplate MW | Summer MW | Winter MW | Minimum load MW |
|---|---|---|---|---|---|
| 1 | Hydroelectric Pumped Storage | 3.5 | 2.0 | 2.0 | 2.0 |
| 2 | Hydroelectric Pumped Storage | 3.5 | 2.0 | 2.0 | 2.0 |
| 3 | Hydroelectric Pumped Storage | 24.0 | 25.4 | 25.0 | 23.0 |
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.