Issue link: https://nebusinessmedia.uberflip.com/i/1535898
wbjournal.com | June 2, 2025 | Worcester Business Journal 17 Proud supporters of Amy's first steps Largest clean energy companies Ranked by number of local employees Company Local employees/ companywide Type of business Products and services Top executive(s)/ year founded 1 Babcock Power Services, Babcock Power Environmental 26 Forest St., Suite 300, Marlborough 01752 508-852-7100 • babcockpower.com 500 (1) N/A Solar, biomass and waste-to-energy Technology, equipment and engineering services Wade Shephard president & CEO, Babcock Power Services & Babcock Power Environmental Michael Leclair president & CEO, Babcock Power Inc. 1913 1 Milton CAT (2) 100 Quarry Drive, Milford 01757 508-634-3400 • miltoncat.com 500 (1) 1,000 Caterpillar machines for power generation and energy storage Includes MC2 Renewable Energy Services, a full-service renewable energy division within Milton CAT Chris Milton president & CEO 1960 3 Aspen Aerogels Inc. (3) 30 Forbes Road, Northborough 01532 508-691-1111 • aerogel.com 159 554 Development and manufacturing of aerogels for clean energy and electrification solutions PyroThin products for electric vehicles and carbon aerogel initiative to increase performance of lithium-ion battery cells Don Young president & CEO 2001 4 Ameresco Inc. (3) 111 Speen St., Suite 401, Framingham 01701 866-263-7372 • ameresco.com 157 1,498 Cleantech integrator and renewable energy asset developer, owner & operator Energy efficiency, renewable generation & energy supply, infrastructure upgrades, energy software & services George Sakellaris president & CEO 2000 5 Ostrow Electric Co. (3) 9 Mason St., Worcester 01609 508-754-2641 • ostrowelectric.com 121 202 Electrical infrastructure from bidding to design-build and engineering Photovoltaic systems for rooftop & large- scale ground mount, wind turbine generators Matthew Ostrow president 1939 6 Commonwealth Fusion Systems (CFS) (3) 117 Hospital Road, Devens 01434 781-606-1233 • cfs.energy 114 650 Fusion energy systems Alcator C-Mod compact, high-magnetic field tokamak, high-temperature superconducting (HTS) magnets for fusion energy generation Bob Mumgaard CEO 2018 7 Solect Energy 89 Hayden Rowe St., Hopkinton 01748 508-598-3511 • solect.com 110 N/A Commercial solar developer and operator with 800+ installations, 700+ current operations and maintenance customers, and 160+ MW of solar energy installed. Design, installation, optimization and maintenance of commercial solar & storage solutions Kenneth Driscoll CEO 2009 8 AMSC (4) 114 E. Main St., Ayer 01432 978-842-3000 • amsc.com 100 (5) 337 Technologies for grid and wind segments Wind turbine system designs licensed under Windtec Solutions with products & services for wind turbine manufacturers Daniel McGahn president & CEO 1987 9 Ascend Elements (6) 133 Flanders Road, Westborough 01581 508-936-7701 • ascendelements.com 95 300 Battery materials manufacturing & recycling Custom lithium-ion battery materials, cathode precursor (pCAM) and lithium carbonate, from recycled batteries & manufacturing scrap; lithium-ion battery recycling services to manufacturers & electric vehicle OEM's Linh Austin president & CEO 2015 10 Donahue & Sons 123 Cut Off Road, Barre 01005 508-380-2082 • donahuesons.com 61 61 Operation and maintenance of solar installations Vegetation management, solar panel washing, solar panel snow removal, critical infrastructure repair Tom Donahue president 2010 10 Endless Energy New England Inc. 261 Cedar Hill St., Suite 100, Marlborough 01752 508-357-2354 • goendlessenergy.com 61 78 Certified Mass Save contractor, HVAC, insulation, plumbing, electrical HVAC systems installation & service, home energy assessments, weatherization & insulation, load management, e-vehicle charging stations, service upgrades Matt Kidd president Amanda Perkins chief operating officer 1980 12 Ambri (7) 53 Brigham St., Suite 8, Marlborough 01752 617-714-5723 • ambri.com 60 65 Manufacturer Grid-scale battery storage for renewable energy David Bradwell CEO 2010 13 Modern Energy 24 Rockdale St., Worcester 01606 508-449-0449 • modernenergynow.com 45 42 Renewable energy & Electrification Design & installation of commercial variable refrigerant flow (VRF) heat pumps, residential mini split heat pumps; insulation, solar PV & LED lighting upgrades John Pitcavage Jeff Vlk co-founders 2017 14 ThinkLite Air LLC 117 West Central St., Suite 201, Natick 01760 617-500-6689 • thinklite.com 34 N/A Indoor air monitoring and purification solutions Indoor air quality monitor with automated alerts, LED light panel and medical-grade air purifier, large space portable medical- grade air purifier Dinesh Wadhwani founder & CEO 2009 Source: Each company via survey as of Q2 2025. Notes: Unable to confirm local employee count by press time for Westborough's LG Energy Solution Vertech Inc., with 150 local employees reported on WBJ's 2023 survey, or Electric Hydrogen, with 300 companywide employees and facilities in Devens and Natick. N/A=not available. (1) Local employee count falls within a range of 500 to 999, according to Mass. Executive Office of Labor and Workforce Development. (2) Includes MC2 Renewable Energy Services, a full-service renewable energy division within Milton CAT (3) Data from WBJ's 2024 survey (4) Formerly known as American Superconductor Corp. (5) Local employee count falls within a range of 100 to 249, according to Mass. Executive Office of Labor and Workforce Development. (6) Formerly Battery Resourcers (7) Emerged from Chapter 11 bankruptcy in July 2024; data is from WBJ's survey, as of March 21, 2024. -Compiled by: Stephanie R. Meagher, research@nebusinessmedia.com ENERGY & SUSTAINABILITY F O C U S