Ashby Duffy CSG Solar Farm
Solar power plant in Middlesex County, Massachusetts. 1.8 MW of nameplate capacity across 1 generator, operated by LSE Cassiopeia LLC.
Also known as Ashby Duffy (CSG) Solar Farm · EIA plant 61399
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 1.8 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- December 2017First generator online
- Operator
- LSE Cassiopeia LLCEIA operator ID 61028
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- None linkedNo verified ISO node
- Location
- Middlesex County, MA42.6800, −71.8300
- EIA plant ID
- 61399EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Ashby Duffy CSG Solar Farm produces
Free · EIA-923Net generation, 2025
3.05 GWh
3,048 MWh, final
Capacity factor, 2025
19.3%
2024: 20.1%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2018 to 2025
3.0–4.2
GWh a year. Low 2018, high 2022
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | Not reported | Not reported | 0 of 12 |
| 2016 | Not reported | Not reported | 0 of 12 |
| 2017 | 32 | Not reported | 1 of 12 |
| 2018 | 2,996 | 19.0% | 12 of 12 |
| 2019 | 3,228 | 20.5% | 12 of 12 |
| 2020 | 3,336 | 21.1% | 12 of 12 |
| 2021 | 3,182 | 20.2% | 12 of 12 |
| 2022 | 4,220 | 26.8% | 12 of 12 |
| 2023 | 3,089 | 19.6% | 12 of 12 |
| 2024 | 3,178 | 20.1% | 12 of 12 |
| 2025 | 3,048 | 19.3% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| DU183 | Solar Photovoltaic | 1.8 | December 2017 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists LSE Cassiopeia LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Modeled curtailment
A range, not one number. The lower bound counts hours inside the production tax credit window; the upper bound is the no-credit case.
Expected vs reported generation
Monthly modeled expected output and physical potential next to EIA-923 reported output.
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Questions about Ashby Duffy CSG Solar Farm
How much power does Ashby Duffy CSG Solar Farm produce?
Ashby Duffy CSG Solar Farm reported 3,048 MWh (3.05 GWh) of net generation in 2025, a 19.3% capacity factor on 1.8 MW of nameplate capacity.
Where is Ashby Duffy CSG Solar Farm?
Ashby Duffy CSG Solar Farm is in Middlesex County, Massachusetts, at 42.6800, −71.8300. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Ashby Duffy CSG Solar Farm?
EIA-860M for August 2026 lists LSE Cassiopeia LLC as the operator (EIA operator ID 61028). The operator is not always the owner.
When did Ashby Duffy CSG Solar Farm start operating?
Its first generator began operating in December 2017, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- Project names from the USGS U.S. Large-Scale Solar Photovoltaic Database
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page