Merck Rahway Power Plant
Union County, New Jersey · EIA plant ID 10224 · Operator: Merck & Co Inc
Nameplate21MWSummer 21 MW
Generators4in service
Net generation41GWh12 mo to Aug 2026
Capacity factor22%gas/coal/oil units, summer MW
Heat rate4,374Btu/kWhfossil units, electric fuel, HHV
First online1977Runs as intermediate
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 41.3 | — | — |
| 2002 | 39.8 | — | — |
| 2003 | 47.6 | 63.2% | 8,453 |
| 2004 | 45.6 | 26.9% | 4,776 |
| 2005 | 51.4 | 30.3% | 4,776 |
| 2006 | 44.6 | 25.6% | 4,776 |
| 2007 | 41.9 | 26.2% | 4,776 |
| 2008 | 37.4 | 28.1% | 4,776 |
| 2009 | 34.6 | 26.7% | 4,776 |
| 2010 | 37 | 28.5% | 4,776 |
| 2011 | 37.2 | 28.7% | 4,776 |
| 2012 | 29.5 | 22.7% | 4,776 |
| 2013 | 25.7 | 19.9% | 4,633 |
| 2014 | 30.4 | 23.4% | 4,633 |
| 2015 | 14.9 | 11.5% | 4,633 |
| 2016 | 4.2 | 3.3% | 4,374 |
| 2017 | 16.5 | 12.1% | 4,374 |
| 2018 | 35.3 | 20.6% | 4,374 |
| 2019 | 43.3 | 23.4% | 4,489 |
| 2020 | 48.4 | 26.1% | 4,494 |
| 2021 | 43.1 | 23.2% | 4,382 |
| 2022 | 37.3 | 20.3% | 4,374 |
| 2023 | 42.3 | 23.0% | 4,374 |
| 2024 | 35.1 | 19.1% | 4,374 |
| 2025 | 39.3 | 21.4% | 4,374 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| GEN8 | Natural Gas Steam Turbine | ST | 5 | 5 | Jan 1977 | Operating (Out of service) | — | coming soon |
| GEN9 | Natural Gas Steam Turbine | ST | 10.8 | 10.8 | Jan 2004 | Operating | — | coming soon |
| GEN9A | Natural Gas Steam Turbine | ST | 4.5 | 5.1 | Dec 2017 | Operating | — | coming soon |
| SOLAR | Solar Photovoltaic | PV | 0.5 | 0.4 | Dec 2005 | Operating | — | coming soon |
| GEN7 | Petroleum Liquids | ST | 4 | 3.8 | Jan 1968 | Retired Nov 2007 | — | coming soon |
Owner / operator
Operator: Merck & Co Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Merck & Co Inc | 100.0% | 21 MW |
Nearby plants
Within 80 km.
| Union County Resource Recovery | 45 MW | 1.6 km |
| Linden Hawk Rise Solar CSG | 4 MW | 2.1 km |
| IGS Solar I - EWR6 | 2 MW | 3.7 km |
| DG Infineum | 2 MW | 3.8 km |
| IGS Solar I - EWR5 | 2 MW | 3.8 km |
| IOS - ERW9 | 5 MW | 4.1 km |