Tyngsborough Solar
Middlesex County, Massachusetts · EIA plant ID 61598 · Operator: Citizens Enterprises Corporation
Nameplate3MWSummer 3 MW
Generators1in service
Net generation3GWh12 mo to Dec 2025
Capacity factor14%solar units, summer MW
Heat rate—thermal plants only
First online2017
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) |
|---|---|---|---|
| 2017 | 3.6 | 16.0% | — |
| 2018 | 4.2 | 18.3% | — |
| 2019 | 4.3 | 19.1% | — |
| 2020 | 4 | 17.7% | — |
| 2021 | 4.4 | 19.4% | — |
| 2022 | 4.6 | 20.0% | — |
| 2023 | 4 | 17.5% | — |
| 2024 | 4 | 17.7% | — |
| 2025 | 3.2 | 14.3% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| PV1 | Solar Photovoltaic | PV | 2.6 | 2.6 | Jan 2017 | Operating | — | coming soon |
Owner / operator
Operator: Citizens Enterprises Corporation. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Citizens Solar Holdings V, LLC | 100.0% | 3 MW |
Nearby plants
Within 80 km.
| Blodgett Solar CSG | 10 MW | 1 km |
| Westford Solar Park | 4 MW | 4.3 km |
| BWC Stony Brook, LLC Hybrid | 2 MW | 5 km |
| Dunstable Solar 1, LLC | 9 MW | 5.8 km |
| Nashua Plant | 2 MW | 9.3 km |
| Groton BESS 1 | 2 MW | 10.1 km |