Data last collected:
PowerPlantFactsEvidence report · prepared 19 October 2026https://powerplantfacts.com/entity/547
EIA plant 547
Northfield · Franklin · MA
Northfield Mountain
Operated by FirstLight Power Resources, Inc. - MA
Published location
Where is Northfield Mountain?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
42.610683, -72.471643
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 MA 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.
1-16,074
2-20,943
3-21,898
4-17,217
5-20,822
6-18,188
7-29,951
8-28,788
9-16,169
10-24,774
11-29,942
12-26,110
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 | -16,074 |
| 2 | -20,943 |
| 3 | -21,898 |
| 4 | -17,217 |
| 5 | -20,822 |
| 6 | -18,188 |
| 7 | -29,951 |
| 8 | -28,788 |
| 9 | -16,169 |
| 10 | -24,774 |
| 11 | -29,942 |
| 12 | -26,110 |
2024 monthly net generation
| Month | Net generation |
|---|---|
| 1 | -16,074 MWh |
| 2 | -20,943 MWh |
| 3 | -21,898 MWh |
| 4 | -17,217 MWh |
| 5 | -20,822 MWh |
| 6 | -18,188 MWh |
| 7 | -29,951 MWh |
| 8 | -28,788 MWh |
| 9 | -16,169 MWh |
| 10 | -24,774 MWh |
| 11 | -29,942 MWh |
| 12 | -26,110 MWh |
Operating generators
| ID | Technology | Fuel | MW | Status |
|---|---|---|---|---|
| 1 | Hydroelectric Pumped Storage | WAT | 292 | OP |
| 2 | Hydroelectric Pumped Storage | WAT | 292 | OP |
| 3 | Hydroelectric Pumped Storage | WAT | 292 | OP |
| 4 | Hydroelectric Pumped Storage | WAT | 292 | OP |
Continue exploring
Similar-capacity plants in the same state
Identity, technology and limitations
EIA plant ID
547
Sector
IPP Non-CHP
Water source
Connecticut 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 Northfield Mountain 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 Northfield Mountain
Generator capacity in different operating conditions
| Generator ID | Technology | Nameplate MW | Summer MW | Winter MW | Minimum load MW |
|---|---|---|---|---|---|
| 1 | Hydroelectric Pumped Storage | 292.0 | 292.0 | 292.0 | 125.0 |
| 2 | Hydroelectric Pumped Storage | 292.0 | 292.0 | 292.0 | 125.0 |
| 3 | Hydroelectric Pumped Storage | 292.0 | 292.0 | 292.0 | 125.0 |
| 4 | Hydroelectric Pumped Storage | 292.0 | 292.0 | 292.0 | 125.0 |
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.