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Commercial Solar EPC in Massachusetts

Ferrius Energy is a commercial solar EPC and battery storage contractor headquartered in Saugus, Massachusetts, delivering engineering, procurement, construction, and O&M for rooftop, carport, ground-mount, and storage projects across the Commonwealth. In Massachusetts the project that pencils is the one that gets three things right together: SMART 3.0 tariff revenue, net metering treatment, and the utility interconnection path.

This page is our working summary of how commercial and industrial solar actually gets built in Massachusetts in 2026: which utility territory you are in, how the incentives stack, where schedules slip, and what a building owner, CFO, or developer should ask before signing an EPC contract.

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Last reviewed: September 2026. SMART rates, net metering rules, and utility fees change; confirm current figures with Massachusetts DOER, the DPU, and your distribution company before relying on them.

Where we work in Massachusetts

We are based on the North Shore in Saugus, which puts Greater Boston, Cambridge, and the Route 128 and I-95 corridors within a short drive of our team. We also scope and build projects in Worcester County, the Pioneer Valley around Springfield, the South Shore, and the rest of the state. We do not maintain separate branch offices; every Massachusetts project is run from Saugus.

The market differs more by utility territory and building type than by city. A 400 kW rooftop on a Worcester distribution warehouse and a 400 kW rooftop on a Cambridge lab building face the same SMART rate, but not the same structural review, the same crane logistics, or the same feeder capacity. What changes from one municipality to the next is permitting practice and fire department expectations for storage, which we cover below.

  • Boston and Cambridge. Dense sites, occupied buildings, limited staging, and frequent roof replacement coordination. Carports and large rooftops are the typical formats.
  • North Shore and Greater Boston suburbs. Industrial parks, retail centers, hotels, and condominium associations near our Saugus base.
  • Worcester and Central Massachusetts. Large-footprint warehouses and manufacturing, plus ground-mount land that brings SMART Mitigation Fee and siting questions.
  • Springfield and Western Massachusetts. Manufacturing loads and a mix of Eversource West and municipal light plant territory, where interconnection costs can run higher.
Scope

What we deliver as your Massachusetts solar contractor

Ferrius carries engineering, procurement, construction, and long-term operations in house, so the team that models your SMART revenue is the same team that files your interconnection application and stamps the drawings. That matters in Massachusetts because the incentive, the utility process, and the design are tightly linked: a change in AC size can move you across a SMART rate band, a Section 48E threshold, and an interconnection review track at the same time.

Commercial and industrial solar

Rooftop systems for warehouses, manufacturing, offices, retail, hospitality, and institutions, sized against your load profile and roof life. See commercial solar installation.

Solar farm development and EPC

Ground-mount and community solar from site control through PTO, including land use screening for SMART eligibility. See solar farm EPC.

Commercial battery storage

Standalone and solar-paired BESS designed for demand charge reduction, ConnectedSolutions, Clean Peak, and the SMART storage adder. See battery storage systems.

Operations and maintenance

Monitoring, inspections, and corrective work that protect 20 years of SMART production revenue. See solar O&M.

SMART 3.0: current regulatory status

The Solar Massachusetts Renewable Target program, now in its 3.0 version under 225 CMR 28.00, is the production-based tariff that usually dominates a Massachusetts commercial solar model. As of late September 2026 it is open, it is paying, and its regulations are being finalized:

SMART 3.0 milestones, per Massachusetts DOER
DateMilestone
May 19, 2026DPU approves the revised SMART 3.0 tariff (Docket 25-175)
June 26, 2026DOER files revised emergency regulations for 225 CMR 28.00
July 8, 2026DPU approves company-specific SMART 3.0 tariffs for Eversource, National Grid, and Unitil
August 7, 2026Public hearing on the emergency regulations
September 11, 2026DOER files final revised regulations with the Secretary of State
September 25, 2026 (expected)Publication of the final regulations in the Massachusetts Register

Program Year 2026 runs through December 31, 2026 with 600 MW AC subject to the capacity cap. Base rates for a 20-year term are $0.2807 per kWh for systems above 25 to 250 kW AC, $0.2430 above 250 to 500 kW AC, $0.2317 above 500 to 1,000 kW AC, and $0.1790 above 1,000 to 5,000 kW AC. A project may claim one location-based adder (for example building mounted, canopy, or landfill) and one off-taker-based adder, with a narrow brownfield exception. Behind-the-meter systems above 25 up to 250 kW AC are exempt from the cap.

Modeling point. For behind-the-meter systems above 25 kW AC, SMART pays the base rate plus adders minus the Value of Energy, not a gross payment on top of bill savings. The 20-year term starts at the Final Statement of Qualification and is not backdated to commercial operation. Our full breakdown is in the SMART 3.0 guide for commercial projects.

Ground-mounted systems above 250 kW AC that are not on previously developed land face a weighted land use Mitigation Fee, and some sites (BioMap Core Habitat, protected open space, wetland resource areas) are ineligible. For a solar farm developer in Massachusetts, that screening belongs before site control, not after.

Utility territory: Eversource, National Grid, Unitil, and municipal light plants

Your distribution company determines your SMART capacity pool, your interconnection queue, and in some cases whether the state programs apply at all. PY2026 SMART capacity is allocated 294.06 MW to Eversource, 270.9 MW to National Grid, and 35.04 MW to Unitil.

Investor-owned utilities

Eversource (split into East and West service areas), National Grid, and Unitil operate under DPU jurisdiction. Their SMART tariffs, net metering tariffs, and interconnection tariffs follow statewide rules, although study timelines and upgrade costs vary sharply by substation and feeder.

Municipal light plants

Dozens of Massachusetts cities and towns, including several near our Saugus base, are served by municipal light plants (MLPs) rather than an investor-owned utility. DOER has stated that MLP territories are not eligible for SMART, and the DPU net metering rules apply to the investor-owned distribution companies, so each MLP sets its own interconnection requirements and net metering or buyback policy. In practice, an MLP project is modeled on self-consumption, the light plant's own rate design, and demand charge reduction rather than SMART revenue. We confirm the MLP's current policy in writing before sizing.

Net Metering

Net metering caps and 60% versus 100% crediting

Massachusetts net metering (220 CMR 18.00) classifies facilities by size: Class I up to 60 kW, Class II above 60 kW to 1 MW, and Class III above 1 MW to 2 MW for private facilities or up to 10 MW for public entities. Separate caps apply to private and public facilities in each utility territory; per the state net metering guide, private caps totaled roughly 778.6 MW and public caps roughly 889.8 MW as of December 2024.

New private solar facilities generally receive Market Net Metering Credits equal to 60 percent of net excess kilowatt-hours valued at the sum of the basic service, distribution, transmission, and transition charges. Facilities of municipalities and other governmental entities receive credits at 100 percent. Class I systems of 25 kW or less are cap exempt, and facilities that serve on-site load with interconnection agreements from January 1, 2021 onward can also qualify outside the caps.

For most commercial owners the practical conclusion is to size the array to on-site consumption. Exported energy earns a discounted credit, so a system that runs large relative to load erodes the return. We run 8,760-hour load matching against your interval data before we fix the AC size.

Interconnection: group studies and Capital Investment Projects

Interconnection is the most common schedule risk for a commercial solar EPC project in Massachusetts, and above a few hundred kilowatts it is often a material cost line. Systems under simplified review move quickly. Larger systems, or projects on saturated feeders, go to impact studies and increasingly to distribution group studies.

Group studies evaluate clusters of distributed generation applications on the same part of the grid together, and the resulting shared upgrades are organized as Capital Investment Projects (CIPs) under the DPU's provisional program. Eversource publishes CIP fees by group; its current Massachusetts figures range from about $224 to $387 per kW in eastern Massachusetts groups and about $498 per kW in a western Massachusetts group. Eversource notifies customers 10 business days after a study is complete, followed by a 40 business day window on the CIP proposal.

The state tracks process improvements through the Interconnection Improvement Reporting Group and DPU Docket 25-48. Our step-by-step walkthrough is in the Massachusetts solar interconnection guide.

Why timing matters now. Under Section 48E as amended by OBBBA, solar facilities that began construction on or before July 4, 2026 are not subject to the 2027 placed-in-service deadline (subject to continuity rules). Facilities that begin construction after July 4, 2026 must be placed in service by December 31, 2027. An open-ended group study can therefore put the federal credit at risk.

Local permitting in Massachusetts

Building permits run through each municipality under the state building code (780 CMR), with electrical permits and inspections handled locally. Roof-mounted commercial systems usually need a structural letter or analysis from a Massachusetts-registered engineer. Ground-mount projects can also involve zoning or site plan review, the local Conservation Commission when wetland buffers are nearby, and a decommissioning plan. Under the Dover Amendment (M.G.L. c. 40A, section 3), municipalities may not unreasonably prohibit or regulate solar installations, though they can impose conditions tied to public health, safety, or welfare.

Battery storage is where local practice varies most. Fire departments review siting, clearances, and emergency response plans for BESS, and several towns now publish their own guidance. We engage the fire department early rather than at permit submission.

Commercial battery storage in Massachusetts: ConnectedSolutions and Clean Peak

Storage earns in Massachusetts from stacked value streams, and the order in which you prioritize them determines the dispatch strategy.

  • Demand charge reduction. Shaving monthly peak kW on commercial tariffs. See how to reduce peak demand charges.
  • ConnectedSolutions. A utility demand response program that pays commercial battery owners for discharging during summer peak events. Payment rates and event rules are set in the Mass Save program materials; confirm the current season's terms with your utility. Our explainer: ConnectedSolutions for commercial batteries.
  • Clean Peak Energy Standard. A DOER program that awards Clean Peak Energy Certificates to qualified resources, including storage, that supply energy or reduce demand during seasonal peak windows. Certificate values and multipliers are set in DOER guidelines.
  • SMART energy storage adder. $0.04 per kWh for PY2026 on paired solar that meets the storage requirements.

For sizing logic and payback ranges, see commercial BESS cost and ROI.

Economics

What commercial solar costs in Massachusetts

DOER's market survey for SMART PY2026 rate setting collected installed-cost data from 51 Massachusetts market participants across 267 project data points. Median gross costs for commercial rooftop ran from $2.12 to $2.85 per watt DC depending on size band, with ground mount above 1 MW at a $2.75 median and solar canopies at $3.42 to $4.19. State modeling for PY2026 put simple payback at 6.5 to 9 years for commercial rooftop systems.

The after-tax number is what matters. Section 48E provides a 6 percent base credit, rising to 30 percent for projects with net output under 1 MW AC or that meet prevailing wage and apprenticeship requirements. Solar assets use 5-year MACRS, and 100 percent bonus depreciation was made permanent in 2025. See how Section 48E and SMART stack, commercial solar cost per watt, and commercial solar payback.

Massachusetts median installed cost, DOER PY2026 survey, dollars per watt DC
ConfigurationSize (kW AC)Median
RooftopAbove 25 to 250$2.78
RooftopAbove 250 to 500$2.12
RooftopAbove 500 to 1,000$2.33
RooftopAbove 1,000 to 5,000$2.85
Ground mountAbove 1,000 to 5,000$2.75
Solar canopyAbove 500 to 1,000$3.42

Industries we serve in Massachusetts

Load shape and ownership structure matter as much as roof area. Industrial and warehouse solar and manufacturing solar pair large roofs with daytime process loads. Cold storage and supermarkets carry high, steady refrigeration demand. Hotels and healthcare facilities need installation plans that work around occupants. Condominium associations, schools and universities, and nonprofits each face distinct tax and approval questions, and solar carports can capture the SMART canopy adder.

Questions

Frequently asked questions

Is the Massachusetts SMART program open for commercial solar in 2026?

Yes. SMART 3.0 Program Year 2026 runs through December 31, 2026 with 600 MW AC subject to the cap. The DPU approved company-specific tariffs for Eversource, National Grid, and Unitil on July 8, 2026, DOER filed final revised regulations on September 11, 2026, and DOER expects them to be published in the Massachusetts Register on September 25, 2026.

Can I get SMART if my building is served by a municipal light plant?

Generally no. DOER has stated that municipal light plant territories are not eligible for SMART, and each light plant sets its own interconnection and net metering or buyback policy. Projects in those territories are usually modeled on self-consumption and demand savings, and the light plant's current policy should be confirmed in writing.

What is the difference between 60 percent and 100 percent net metering credits?

New private solar facilities generally receive Market Net Metering Credits on 60 percent of net excess kilowatt-hours, valued at the basic service, distribution, transmission, and transition charges. Facilities owned by municipalities and other governmental entities receive credits at 100 percent. For most private owners this means sizing the array to on-site load.

How long does commercial solar interconnection take in Massachusetts?

It depends on size and feeder. Small systems under simplified review move quickly, while larger projects can enter impact studies or distribution group studies that lead to Capital Investment Project fees. Eversource's current published CIP fees range from about $224 to $498 per kW depending on the group. We request feeder information before committing to a schedule.

Does Ferrius Energy work outside Greater Boston?

Yes. We are headquartered in Saugus and scope projects statewide, including Worcester, Springfield, and the South Shore, as well as in the seven other states we serve. All Massachusetts work is managed from our Saugus office.

Sources

  • Massachusetts DOER, SMART 3.0 Program Details. mass.gov
  • Massachusetts DOER, SMART Program Year 2026 Annual Report. mass.gov
  • Massachusetts DOER, SMART market survey aggregated results. mass.gov
  • Massachusetts DOER, SMART Program Municipalities Q&A. mass.gov
  • Massachusetts DOER, Net Metering Guide. mass.gov
  • 220 CMR 18.04, Calculation of Net Metering Credits. law.cornell.edu
  • Massachusetts DPU, Utility Interconnection in Massachusetts. mass.gov
  • Eversource, Massachusetts Distribution Group Studies. eversource.com
  • Massachusetts DOER, Clean Peak Energy Standard. mass.gov
  • National Grid, ConnectedSolutions for Massachusetts business customers. nationalgridus.com
  • 26 U.S.C. 48E, Clean Electricity Investment Credit. uscode.house.gov
  • IRS, Clean Electricity Investment Credit. irs.gov
Keep Reading

Related pages and guides

SMART 3.0

Massachusetts SMART 3.0 rates and adders →

Interconnection

Massachusetts interconnection guide →

EPC delivery

Commercial solar EPC services →

Storage revenue

ConnectedSolutions for commercial batteries →

Financing

Commercial solar financing options →

Service area

All eight states we serve →

Talk to Our Engineering Team →