Williamsville Hybrid CSG
Solar and battery storage project in Worcester County, Massachusetts. 8.3 MW of nameplate capacity across 2 generators, operated by 147 Williamsville Solar 1, LLC.
Also known as Williamsville Hybrid · Williamsville Hybrid (CSG) · EIA plant 63805
This project groups Williamsville Hybrid CSG (EIA 63805). EIA reports them as separate plants.
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 8.3 MWSolar 5.0 · Battery storage 3.3
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- September 2021First generator online
- Operator
- 147 Williamsville Solar 1, LLCEIA operator ID 63490
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 1 ISONE nodeResource nodes with prices
- Location
- Worcester County, MA42.4695, −72.0698
- EIA plant ID
- 63805EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Williamsville Hybrid CSG produces
Free · EIA-923Net generation, 2025
7.65 GWh
7,654 MWh, final
Capacity factor, 2025
17.6%
2024: 20.5%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2022 to 2025
7.0–8.9
GWh a year. Low 2023, high 2024
| 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 | Not reported | Not reported | 0 of 12 |
| 2018 | Not reported | Not reported | 0 of 12 |
| 2019 | Not reported | Not reported | 0 of 12 |
| 2020 | Not reported | Not reported | 0 of 12 |
| 2021 | 1,294 | Not reported | 4 of 12 |
| 2022 | 8,473 | 19.4% | 12 of 12 |
| 2023 | 6,968 | 16.2% | 12 of 12 |
| 2024 | 8,938 | 20.5% | 12 of 12 |
| 2025 | 7,654 | 17.6% | 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 account · ISONEEmissions
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 |
|---|---|---|---|
| WBESS | Batteries | 3.3 | September 2021 |
| WIL | Solar Photovoltaic | 5.0 | September 2021 |
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 147 Williamsville Solar 1, 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 Williamsville Hybrid CSG
How much power does Williamsville Hybrid CSG produce?
Williamsville Hybrid CSG reported 7,654 MWh (7.65 GWh) of net generation in 2025, a 17.6% capacity factor on 8.3 MW of nameplate capacity.
Where is Williamsville Hybrid CSG?
Williamsville Hybrid CSG is in Worcester County, Massachusetts, at 42.4695, −72.0698. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Williamsville Hybrid CSG?
EIA-860M for August 2026 lists 147 Williamsville Solar 1, LLC as the operator (EIA operator ID 63490). The operator is not always the owner.
Is Williamsville Hybrid CSG a solar or a battery storage plant?
Both. Solar capacity totals 5 MW and battery storage capacity totals 3.3 MW.
When did Williamsville Hybrid CSG start operating?
Its first generator began operating in September 2021, according to EIA-860M.
Does InfraMap have power prices for Williamsville Hybrid CSG?
Yes. InfraMap has ISONE day-ahead and real-time prices at 1 price node linked to Williamsville Hybrid CSG, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
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)
- ISONE day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
- 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