3Colton
Worcester County, Massachusetts · EIA plant ID 66320 · Operator: Madison Energy Holdings LLC
Nameplate3MWSummer 3 MW
Generators1in service
Net generation5GWh12 mo to Dec 2025
Capacity factor16%solar units, summer MW
Heat rate—thermal plants only
First online2023
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), solar 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) |
|---|---|---|---|
| 2023 | 1.6 | 10.4% | — |
| 2024 | 5.1 | 16.9% | — |
| 2025 | 4.9 | 16.4% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 3COLT | Solar Photovoltaic | PV | 3.4 | 3.4 | Jul 2023 | Operating | — | coming soon |
Owner / operator
Operator: Madison Energy Holdings LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Madison Energy Holdings LLC | 100.0% | 3 MW |
Nearby plants
Within 80 km.
| Millbury MA #1092 | 1 MW | 1.8 km |
| Wheelabrator Millbury Facility | 48 MW | 2.8 km |
| Worcester Landfill | 7 MW | 4.4 km |
| Grafton Solar | 2 MW | 5.1 km |
| Syncarpha Millbury Hybrid (CSG) | 9 MW | 5.6 km |
| DG Tufts Science LLC CSG | 1 MW | 5.6 km |