Massachusetts Commercial Solar: Eversource SMART Program and C-PACE Financing
Massachusetts consistently ranks among the top commercial solar markets in the United States — not because of its sunshine (it has less than most states), but because of its high electricity rates, strong state incentive programs, and sophisticated financing ecosystem. For commercial property owners, the combination of the SMART program, net metering, federal ITC, and C-PACE financing creates one of the most compelling solar investment cases in the country.
The SMART Program: Massachusetts' Solar Incentive
The Solar Massachusetts Renewable Target (SMART) program provides a fixed per-kWh incentive payment for 10 years on qualifying solar installations. The incentive is paid by the utility (Eversource or National Grid) on top of net metering compensation, creating a predictable, bankable revenue stream that significantly improves project economics.
SMART incentive rates are set by capacity block — earlier blocks had higher rates, and rates decline as each block fills. Current SMART rates for commercial installations vary by utility territory and system size, but remain meaningful for project economics. The program has been extended and expanded multiple times, reflecting Massachusetts' commitment to solar development.
SMART adders are available for projects that include battery storage, serve low-income communities, or are located on certain preferred site types (brownfields, landfills, parking structures). These adders can increase the base SMART rate by 20–50%, significantly improving project economics for qualifying projects.
Eversource Commercial Rate Structures
Eversource serves the majority of eastern Massachusetts commercial customers under rate schedules that include significant demand charge components. The G-2 (General Service Medium) and G-3 (General Service Large) rates apply to most commercial properties, with demand charges that can represent 40–60% of the total bill for some customers.
Eversource's time-of-use rate options for commercial customers can significantly affect solar economics — on-peak generation during summer afternoons is more valuable than off-peak generation, and battery storage can be dispatched to maximize on-peak self-consumption and demand charge reduction.
Eversource has been investing in grid modernization and has improved commercial solar interconnection timelines in recent years, though interconnection costs and timelines still vary by location and system size.
Net Metering in Massachusetts
Massachusetts has a strong net metering program for commercial customers, with compensation at the full retail rate for excess generation up to the customer's annual consumption. Net metering credits can be carried forward month-to-month and applied against future bills.
Massachusetts also allows net metering credit aggregation, which allows a solar installation on one property to generate credits that are applied to electricity bills at other properties owned by the same entity. This is particularly valuable for commercial property owners with multiple locations.
The interaction between SMART program payments and net metering compensation requires careful analysis — the two programs have different payment structures and the combined value depends on your specific rate schedule and consumption pattern.
Massachusetts C-PACE: MassDevelopment
Massachusetts C-PACE is administered through MassDevelopment, the state's finance and development authority. The program covers solar, battery storage, energy efficiency, and other clean energy improvements, with financing terms up to 25 years.
MassDevelopment's C-PACE program has a streamlined approval process and strong lender participation, making it one of the more accessible C-PACE programs in the Northeast. The program is available statewide, not just in select counties.
The combination of SMART program payments, net metering credits, federal ITC, accelerated depreciation, and C-PACE financing can make Massachusetts commercial solar cash-flow positive from day one for many properties — a compelling case that requires careful modeling to quantify accurately.
Stacking Massachusetts Incentives: The Full Picture
A well-structured Massachusetts commercial solar project can capture: federal ITC (30% of project cost), accelerated depreciation (MACRS, worth approximately 20% of project cost in present value), SMART program payments (10-year fixed incentive), net metering compensation, demand charge reduction, and C-PACE financing (100% project financing, no upfront capital).
Properly stacking these incentives requires expertise in each program's rules, application timelines, and interaction effects. SMART program capacity fills in blocks — timing your project to capture available capacity is critical. C-PACE lender consent from existing mortgage holders must be secured early. ITC and depreciation require coordination with your tax advisor.
An independent consultant who works regularly in the Massachusetts market can navigate all of these moving parts, identify the optimal incentive stack for your property, and ensure your installer's proposal accurately reflects the full value of available programs.
The San Diego Solar Buyer's Checklist
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