621 Energy, LLC

What 621 Energy, LLC does

621 Energy, LLC is a Massachusetts-based solar photovoltaic developer and installer founded in 2011 and headquartered in Concord, MA. The company designs, finances, builds, owns, operates, and services commercial-scale solar PV systems — including rooftop, ground-mount, carport, and dual-axis tracking configurations — for businesses and nonprofit organizations across Massachusetts, with selected projects in Connecticut and Arizona. Its technology stack combines SolarEdge DC optimizers and inverters for module-level monitoring and maximum-power-point tracking with AllEarth Renewables dual-axis trackers that use GPS to follow the sun and produce roughly 35% more electricity than fixed-tilt systems. The company owns and co-owns an estimated 20 solar projects for Massachusetts nonprofits, which it cites as the basis for its "owner's perspective" operating model, and benchmarks system performance against Boston-area commercial rooftops (kWh/kWp range 758–1,417).

The firm's revenue model spans one-time turnkey project development fees and a portfolio of recurring-revenue financing structures, including Power Purchase Agreements, Operating Leases (7-year), Site Leases (20-year), Hybrid Leases (nonprofit-specific), Capital Leases (7-year, $1 buyout), and direct purchase. It also offers a Community Shared Solar subscription product, Operations & Maintenance contracts (SolrenView monitoring, monthly kWh analysis, daily reliability monitoring), and standalone consulting services including feasibility studies, commissioning, and remote/off-grid advisory work (e.g., Grand Canyon West). Project sizes range from approximately 14 kW residential-scale to nearly 500 kW commercial installations, with anchor customers including Massachusetts General Hospital (476 kW), Hoosac Valley Middle/High School (495 kW), Melrose Bank, Becket-Chimney Corners YMCA, and The Trustees of Reservations. Go-to-market is sales-led and direct, supported by case studies and a website project gallery; no marketing automation, no disclosed headcount, no funding rounds, and no M&A activity are reported.

Name

621 Energy, LLC

Legal name

621 Energy, LLC

Website

https://621energy.com

Company type

Private

Founded year

2011

Operating status

Operating

Headcount range

1–10 employees

Short description

621 Energy, LLC is a Massachusetts-based commercial solar developer founded in 2011 that designs, finances, installs, owns, and services rooftop, ground-mount, carport, and dual-axis PV systems for businesses and nonprofit organizations, primarily in Massachusetts with selected projects in Connecticut and Arizona.

Ownership category

akta.pro rank

Product category

Commercial Solar PV Development and Installation

NAICS

Solar Electric Power Generation (221114), Electric Power Generation (22111)

SIC

Electric Services (4911), Cogeneration Services & Small Power Producers (4991)

akta.pro primary industry

Solar EPC & Construction (Utility-Scale, Rooftop, Balance of System) (EUAMABAB)

akta.pro secondary industries

Solar Project Development & IPP (Utility-Scale & Rooftop) (EUAMABAA), Solar Financing, Leasing & Ownership Platforms (Tax Equity, PPA, Securitization) (EUAMABAJ), Operations, Maintenance & Asset Management (O&M, Vegetation, Spares, SCADA) (EUACAGAH)

Keywords

• Commercial solar development
• Solar PV installation
• Solar financing solutions
• Operations and maintenance
• Solar consulting services

Headquarters

HQ city

Concord

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Marketing or Sales

Revenue model

1. Power Purchase Agreement (PPA): 621 Energy or an investment partner finances, builds, owns, and maintains the system. The host purchases clean solar electricity at a low and stable rate below the local utility price. The host pays only for electricity generated and may purchase the system in the future.
2. Solar Lease Options: Operating Lease: 7-year fixed lease payments (100% tax-deductible), after 7 years host may purchase for 15% of cost. Site Lease: 20-year contracted lease payments for use of roof/parking lot/land. Hybrid Lease: 16% investor discount for nonprofits with ownership after 6 years when tax benefits are consumed.
3. Capital Lease / Loan Financing: 621 Energy offers Capital Lease through financing partners with 7-year term, UCC filing on equipment, $1.00 buyout at end. Customer can depreciate full value, utilize ITC, and deduct interest portion of lease payments.
4. Turnkey Project Development: 621 Energy develops a turnkey project for the owner for a fee, or develops a project financed through partnership arrangement with owner and investors.
5. Consulting Services: Provides energy consulting and solar advisory services including utility bill analysis, PV system feasibility studies, commissioning/re-commissioning, and monitoring of PV system performance.

Pricing tiers

Go-to-market motion1 record

Distribution channels5 records

Marketing channels4 records

Core offering

621 Energy, LLC is a Massachusetts-based solar developer that builds, owns, operates, and services commercial-scale solar photovoltaic (PV) systems for businesses and nonprofit organizations. The company delivers end-to-end solar solutions spanning project development, turnkey engineering and installation, multiple financing structures (PPA, operating/site/hybrid lease, capital lease, loan), and ongoing operations, maintenance, and consulting services. Physical product offerings include rooftop, ground-mounted, carport, and dual-axis tracking PV systems installed across Massachusetts, Connecticut, and Arizona.

Product overview

621 Energy, LLC is a Massachusetts-based solar installation and services company offering a comprehensive portfolio of solar PV solutions. The core offerings include Project Development, Turnkey Installation, Financing Solutions (PPAs, leases, and loans), Operations & Maintenance, and Solar and Energy Consulting Services. The company also offers Community Shared Solar programs. Product portfolio encompasses rooftop PV systems (ballasted, standing seam metal, and shingled roof mounts), ground-mounted systems, carport systems, and dual-axis tracking systems. All projects are supported by web-based monitoring solutions including SolrenView and SolarEdge module-level optimization. Since founding in 2011, the company has served businesses and nonprofit organizations across Massachusetts, with special focus on nonprofits through its mission-driven approach.

Differentiator

Problem solved

Functional benefit

Products and services

• Project Development Collaborative development of high-performing solar PV projects on customer buildings or land, including property evaluation, solar resource assessment, system sizing, financial analysis, permitting, and state/utility incentive applications such as net metering and SMART.
• Turnkey Installation Complete installation of commercial solar PV systems using proven engineering, project management, and installation processes, delivered on schedule and within budget with NABCEP-certified PV Installation Professionals overseeing each project.
• Operations and Maintenance Ongoing solar PV maintenance including real-time web-based monitoring, monthly kWh performance analysis, daily reliability monitoring, troubleshooting, repairs, and scheduled maintenance such as electrical connection inspection and inverter servicing.
• Solar and Energy Consulting Services Energy consulting including utility bill analysis, usage evaluation, identification of energy conservation opportunities, PV feasibility studies, commissioning and re-commissioning of PV systems, and ongoing performance monitoring on daily, weekly, or monthly cadences.
• Power Purchase Agreement (PPA) Long-term contract allowing the host to purchase solar-generated electricity at a pre-determined rate below the local utility price, with 621 Energy or an investment partner financing, owning, and maintaining the system. Host pays only for electricity generated and may purchase the system in the future.
• 3rd Party Solar Lease Options Suite of third-party solar lease structures including a 7-year Operating Lease (100% tax-deductible with option to purchase for 15% of cost), a 20-year Site Lease for roof/parking lot/land use, and a Hybrid Lease tailored for nonprofits over 50 kW that delivers a 16% investor discount and transfers ownership to the nonprofit after 6 years once tax benefits are consumed.
• Loan or Capital Lease Financing Capital Lease and fixed-rate term loan financing through partner lenders, typically with a 7-year term, UCC filing on equipment only, and a $1.00 buyout at end of term. Customer depreciates full system value, utilizes the Investment Tax Credit, and deducts the interest portion of lease payments.
• Community Shared Solar Community solar subscription program allowing multiple participants to share the benefits of a local 621 Energy-developed solar array. Panel shares are sized to match annual electricity bills, and monthly dollar-value credits offset participating customers' electric bills.

Quantifiable outcome

• Melrose Bank: 52% reduction in electricity consumption, 36-ton carbon reduction annually (equivalent to 7.5 cars)
• +5 more outcomes

Named customers10 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Two partnerships are on record, tiered minor.

• JM Electrical, Inc.minorImplementation/ SI/ Consulting PartnerPartnered with 621 Energy on the Hoosac Valley Middle/High School project. JM Electrical performed all electrical installation for the 495 kW ground-mounted solar PV project.
• PearLuna GroupminorStrategic or Co-development PartnerWorked in partnership with 621 Energy to provide consulting services for Grand Canyon West solar project. Produced Preliminary Design Report for solar generating facility at Hualapai Reservation in Arizona.

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Pivot Energy: National community solar and C&I solar developer with active presence in Massachusetts and other Northeast states; competes directly for the same nonprofit and institutional customer pipeline.
• Nexamp: Massachusetts-based community solar and C&I solar developer with turnkey project development, financing, and O&M capabilities — the most direct head-to-head competitor for 621 Energy in the MA commercial and community solar market.
• BlueWave Solar: Massachusetts-based solar project developer and IPP focused on community solar and C&I installations; competes for the same nonprofit, municipal, and commercial customer base in the Northeast.
• Borrego Solar: New England-headquartered commercial and utility-scale solar EPC and developer offering turnkey design, installation, financing, and O&M — comparable in scope and customer segments to 621 Energy but with greater scale.

Broad incumbents

• Sunrun: National residential and small-commercial solar lease and PPA provider; a broad incumbent with comparable financing-led customer acquisition approach, though tilted toward residential.
• SolarCity (Tesla Energy): Now operating as Tesla Energy, the largest U.S. residential and C&I solar developer; broad incumbent competing across multiple commercial solar segments and geographies including the Northeast.

Regional players

• ReVision Energy: Northern New England-based (Maine/New Hampshire) solar installer serving commercial, institutional, and residential customers with turnkey solutions — comparable business model and customer mix, but operating in a different primary geography.

Others

• AllEarth Renewables: Vermont-based manufacturer of the dual-axis solar trackers that 621 Energy installs; a key supplier partner and an adjacent business in the Northeast distributed-solar ecosystem.
• Mass Solar Initiative / Energy New England: Regional clean energy aggregation and program administrator serving Massachusetts municipal and nonprofit customers; an adjacent ecosystem participant that influences 621 Energy's customer pipeline and incentive structure.

Emerging players

• Quinta Energy (previously Clean Energy Collective): Community solar development and management platform; an emerging player in the community solar space that competes for subscriber aggregation in states like Massachusetts.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/621-energy-llc

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about 621 Energy, LLC