Happy Hollow CSG Hybrid
Solar and battery storage project in Worcester County, Massachusetts. 8.3 MW of nameplate capacity across 2 generators, operated by REA Investments, LLC.
Also known as Happy Hollow (CSG) Hybrid · EIA plant 62652
This project groups Happy Hollow CSG Hybrid (EIA 62652). 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
- October 2019First generator online
- Operator
- REA Investments, LLCEIA operator ID 63359
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 1 ISONE nodeResource nodes with prices
- Location
- Worcester County, MA42.6070, −72.0453
- EIA plant ID
- 62652EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Happy Hollow CSG Hybrid produces
Free · EIA-923Net generation, 2025
8.15 GWh
8,146 MWh, final
Capacity factor, 2025
19.1%
2024: 20.1%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2020 to 2025
7.9–8.6
GWh a year. Low 2021, 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 | Not reported | Not reported | 0 of 12 |
| 2018 | Not reported | Not reported | 0 of 12 |
| 2019 | 984 | Not reported | 3 of 12 |
| 2020 | 8,256 | 18.8% | 12 of 12 |
| 2021 | 7,871 | 18.0% | 12 of 12 |
| 2022 | 8,633 | 19.7% | 12 of 12 |
| 2023 | 7,968 | 18.2% | 12 of 12 |
| 2024 | 8,591 | 20.1% | 12 of 12 |
| 2025 | 8,146 | 19.1% | 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 |
|---|---|---|---|
| HHESS | Batteries | 3.3 | October 2019 |
| HHPV | Solar Photovoltaic | 5.0 | October 2019 |
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 REA Investments, 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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Power plants near Happy Hollow CSG Hybrid
More plants operated by REA Investments, LLC
Questions about Happy Hollow CSG Hybrid
How much power does Happy Hollow CSG Hybrid produce?
Happy Hollow CSG Hybrid reported 8,146 MWh (8.15 GWh) of net generation in 2025, a 19.1% capacity factor on 8.3 MW of nameplate capacity.
Where is Happy Hollow CSG Hybrid?
Happy Hollow CSG Hybrid is in Worcester County, Massachusetts, at 42.6070, −72.0453. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Happy Hollow CSG Hybrid?
EIA-860M for August 2026 lists REA Investments, LLC as the operator (EIA operator ID 63359). The operator is not always the owner.
Is Happy Hollow CSG Hybrid a solar or a battery storage plant?
Both. Solar capacity totals 5 MW and battery storage capacity totals 3.3 MW.
When did Happy Hollow CSG Hybrid start operating?
Its first generator began operating in October 2019, according to EIA-860M.
Does InfraMap have power prices for Happy Hollow CSG Hybrid?
Yes. InfraMap has ISONE day-ahead and real-time prices at 1 price node linked to Happy Hollow CSG Hybrid, 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
- 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