Ashby Duffy CSG Solar Farm
Middlesex County, Massachusetts · EIA plant ID 61399 · Operator: LSE Cassiopeia LLC
Nameplate2MWSummer 2 MW
Generators1in service
Net generation3GWh12 mo to Dec 2025
Capacity factor19%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 | 0 | 2.4% | — |
| 2018 | 3 | 19.0% | — |
| 2019 | 3.2 | 20.5% | — |
| 2020 | 3.3 | 21.1% | — |
| 2021 | 3.2 | 20.2% | — |
| 2022 | 4.2 | 26.8% | — |
| 2023 | 3.1 | 19.6% | — |
| 2024 | 3.2 | 20.1% | — |
| 2025 | 3 | 19.3% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| DU183 | Solar Photovoltaic | PV | 1.8 | 1.8 | Dec 2017 | Operating | — | coming soon |
Owner / operator
Operator: LSE Cassiopeia LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| LSE Cassiopeia LLC | 100.0% | 2 MW |
Nearby plants
Within 80 km.
| Ashby Solar, LLC CSG | 2 MW | 6.1 km |
| Ashburnham Energy Storage Project | 3 MW | 8 km |
| Fitchburg Renewables | 4 MW | 8.9 km |
| 651 Chase Solar NG | 3 MW | 9.3 km |
| NESG Solar Holding Company 1, LLC | 3 MW | 9.4 km |
| Settlers Solar | 5 MW | 9.8 km |