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621 Energy

Custom-engineered, peak-performing systems, personalized service.
As a part-owner of 20 solar energy projects for Massachusetts nonprofits, 621 Energy has a unique “owner’s perspective” we bring to the implementation of all our solar PV projects, with special attention to maximizing the lifetime value of the project.
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Turnkey solar photovoltaic installation and project development of commercial, educational, non-profit and agricultural projects. Project financing available through Power Purchase Agreement, Loan or Lease.
An integral part of our mission is to invest our profits and time into providing solar solutions to the nonprofits that serve our local communities.
Year Established
Phone Number
Reasons Why You Should Work With Us
  1. We simplify solar

  2. Technical expertise

  3. Responsiveness and personal touch

Services Offered

  • Installation
  • Financing
  • Manufacturing
  • General Contracting
  • Solar Repair & Maintenance

Workmanship Warranty

10 years minimum all parts, 5 years labor


MA Construction Supervisor CS-106811


General Liability: $1M per occurrence & $2M aggregate
Umbrella: $1M
Workers Comp: $1M



Industry Certifications

  • North American Board of Certified Energy Practitioners

Manufacturer Certifications

  • PWRpartner

What Customers Are Saying

2 reviews
Average Rating 2 review(s)
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621 Energy a True Partner

First Congregational Church in Melrose selected 621 Energy after careful review of 6 quotes provided by EnergySage. 621 Energy was responsive to the needs (and sometimes delays) of a non-profit, worked with us to get the best offer to our capital campaign committee, and once a contract was signed moved quickly through a very rainy fall to install our system. They have proven to be a true partner to our organization.

Posted by ltimmermann on Mar 17, 2015
Manager, Archives & Research Center, The Trustees of Reservations

Energy Sage put me in touch with many possible vendors, but it was Bob Clarke of 621 Energy who was ready and able to make our installation possible. He knew what questions to ask, could easily explain what would be possible, and helped us succeed in getting our installation to happen - 40kw 5-pole mounted trackers.

Posted by Alison in Massachusetts on Jun 09, 2014
    • Commercial
    • Solar PV
    • 24.9 kW
    Elmcourt Hotel Solar Installation
    • House of Worship
    • Solar PV
    • 100.8 kW
    First Congregational Church of Melrose Goes Solar!
    • Farm
    • Solar PV
    • 27.5 kW
    Nonprofit Solar Financing!
    • Other
    • Solar PV
    • 22.95 kW
    Solar for Chimney Corners Camp Dining Hall in Becket, MA



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