Regional Waste Systems
Cumberland County, Maine · EIA plant ID 50225 · Operator: Ecomaine
Nameplate13MWSummer 12 MW
Generators1in service
Net generation87GWh12 mo to Aug 2026
Capacity factor86%other units, summer MW
Heat rate19,347Btu/kWhfossil units, electric fuel, HHV
First online1988
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.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 81.5 | 80.8% | — |
| 2002 | 79.2 | 78.6% | — |
| 2003 | 77.9 | 77.3% | — |
| 2004 | 83.1 | 81.2% | 21,804 |
| 2005 | 83.7 | 83.0% | 20,689 |
| 2006 | 85 | 83.2% | 20,286 |
| 2007 | 76.9 | 76.3% | — |
| 2008 | 72.5 | 71.8% | — |
| 2009 | 87.6 | 86.9% | — |
| 2010 | 88.6 | 87.9% | — |
| 2011 | 84.8 | 84.2% | — |
| 2012 | 87.2 | 86.3% | — |
| 2013 | 88.6 | 86.9% | 21,564 |
| 2014 | 88.1 | 86.6% | 22,244 |
| 2015 | 78.2 | 76.9% | 22,856 |
| 2016 | 91.6 | 90.2% | 19,789 |
| 2017 | 82.9 | 81.6% | 21,044 |
| 2018 | 84.2 | 83.0% | 21,478 |
| 2019 | 79.4 | 78.2% | 24,372 |
| 2020 | 86.2 | 84.2% | 22,155 |
| 2021 | 88.2 | 87.0% | 21,144 |
| 2022 | 39.3 | 38.5% | — |
| 2023 | 81.1 | 79.8% | 21,601 |
| 2024 | 82.3 | 80.7% | 18,960 |
| 2025 | 88.5 | 87.2% | 18,686 |
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 |
|---|---|---|---|---|---|---|---|---|
| TG1 | Municipal Solid Waste | ST | 13.3 | 11.5 | Jun 1988 | Operating | — | coming soon |
Owner / operator
Operator: Ecomaine. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Ecomaine | 100.0% | 13 MW |
Nearby plants
Within 80 km.
| Westbrook Energy Center Power Plant | 564 MW | 3.2 km |
| Larson | 5 MW | 3.5 km |
| S D Warren Westbrook | 70 MW | 3.6 km |
| South Portland ESS, LLC | — | 3.6 km |
| Cross Town Energy Storage | 175 MW | 5.9 km |
| Gorham Solar 1 (CSG) | 5 MW | 6.1 km |