GMP Solar - Williston
Chittenden County, Vermont · EIA plant ID 60875 · Operator: Green Mountain Power Corp
Nameplate5MWSummer 5 MW
Generators1in service
Net generation6GWh12 mo to Aug 2026
Capacity factor15%solar units, summer MW
Heat rate—thermal plants only
First online2016
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), 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) |
|---|---|---|---|
| 2016 | 0.1 | 2.0% | — |
| 2017 | 6.8 | 16.5% | — |
| 2018 | 6.9 | 16.8% | — |
| 2019 | 7.2 | 17.5% | — |
| 2020 | 7.2 | 17.4% | — |
| 2021 | 6.8 | 16.6% | — |
| 2022 | 7.2 | 17.4% | — |
| 2023 | 6.8 | 16.4% | — |
| 2024 | 6.9 | 16.7% | — |
| 2025 | 6.2 | 15.0% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GMPSW | Solar Photovoltaic | PV | 4.7 | 4.7 | Nov 2016 | Operating | — | coming soon |
Owner / operator
Operator: Green Mountain Power Corp. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| GMP VT Solar LLC | 100.0% | 5 MW |
Nearby plants
Within 80 km.
| Essex VT BESS 1 | — | 2 km |
| Essex Junction 19 | 16 MW | 2.1 km |
| Whitcomb Solar Farm | 2 MW | 3.5 km |
| 158th Fighter Wing Solar Farm | 1 MW | 4.2 km |
| Chittenden County Solar Partners | 2 MW | 4.7 km |
| Gorge 18 | 3 MW | 5.9 km |