Wheelabrator Millbury Facility
Worcester County, Massachusetts · EIA plant ID 50878 · Operator: Wheelabrator Environmental Systems
Nameplate48MWSummer 40 MW
Generators1in service
Net generation288GWh12 mo to Aug 2026
Capacity factor82%other units, summer MW
Heat rate—thermal plants only
First online1987
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), other 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.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 325 | 92.7% | — |
| 2002 | 328.4 | 93.7% | — |
| 2003 | 321.1 | 91.6% | — |
| 2004 | 328.4 | 93.5% | — |
| 2005 | 329.4 | 94.0% | — |
| 2006 | 328.5 | 93.8% | — |
| 2007 | 317.1 | 90.5% | — |
| 2008 | 321 | 91.4% | — |
| 2009 | 316.2 | 90.3% | — |
| 2010 | 318.7 | 91.0% | — |
| 2011 | 314.7 | 89.8% | — |
| 2012 | 322.6 | 91.8% | — |
| 2013 | 324.3 | 92.5% | — |
| 2014 | 321.9 | 91.9% | — |
| 2015 | 325.2 | 92.8% | — |
| 2016 | 315 | 89.6% | — |
| 2017 | 293.5 | 83.8% | — |
| 2018 | 319.5 | 91.2% | — |
| 2019 | 310.4 | 88.6% | — |
| 2020 | 313.2 | 89.1% | — |
| 2021 | 320.6 | 91.5% | — |
| 2022 | 318.6 | 90.9% | — |
| 2023 | 314 | 89.6% | — |
| 2024 | 318 | 90.5% | — |
| 2025 | 319.2 | 91.1% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Municipal Solid Waste | ST | 47.6 | 40 | Sep 1987 | Operating | — | coming soon |
Owner / operator
Operator: Wheelabrator Environmental Systems. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Wheelabrator Environmental Systems | 100.0% | 48 MW |
Nearby plants
Within 80 km.
| Worcester Landfill | 7 MW | 2 km |
| 3Colton | 3 MW | 2.8 km |
| Millbury MA #1092 | 1 MW | 3 km |
| Syncarpha Millbury Hybrid (CSG) | 9 MW | 5.6 km |
| Clark University | 2 MW | 5.6 km |
| AbbieVie, Inc. - Worcester, MA | 3 MW | 6 km |