Solar in Massachusetts costs about $3.02 per watt, so the 8.74 kW system Massachusetts homeowners typically install runs about $26,400 before incentives. That price is above average, but 30¢ to 34¢ power and near-retail net metering bring simple payback before incentives to about 7.5 years statewide (5.9 to 8.1 years by utility) if Eversource, National Grid or Unitil is your utility, and 20 years of SMART 3.0 payments come on top.
Check what your Massachusetts roof could earn
In Massachusetts your utility decides whether SMART payments and net metering apply. Your ZIP code shows local prices and installers.
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Bill credits, monthly checks and a battery payment: what a Massachusetts roof earns
Most solar incentives happen once. In Massachusetts, a system on a big-utility grid keeps paying. It cuts your bill, earns a monthly SMART check, and a battery can earn a third payment.
SMART 3.0 is a capacity race, not a deadline raceProgram Year 2026 has a 600 MW AC statewide cap. Once it fills, the program closes to new applicants until the next Program Year.
Eversource, National Grid, Unitil or a light plant: the question before any quote
Forty-one Municipal Light Plants (MLPs) serve all or part of 50 cities and towns, including Belmont, Braintree, Reading and Taunton. Which side of that line you live on decides most of the math.
Eversource, National Grid or Unitil
Near-retail net metering on systems up to 25 kW AC, SMART 3.0 payments for 20 years, and ConnectedSolutions for enrolled batteries.
A Municipal Light Plant
MLPs aren’t required to offer net metering or SMART. If yours doesn’t, most of the income on this page doesn’t apply.
How to checkLook at who sends your electric bill. If it is your town’s light department, ask it about net metering before you request quotes.
What a 9 kW Massachusetts system brings in each year
Here is the full income stack for a 9 kW system making about 10,000 kWh a year. SMART pays on top of your net metering credits, straight from Eversource, National Grid or Unitil.
SMART payments are taxableThey count as income for both federal and Massachusetts tax. Any return figure that skips this is inflated. Run the after-tax numbers, especially in a higher bracket.
If you sell the houseSMART payments are tied to the system, not the owner. The new owner takes over the remaining term.
About 7.5 years to break even: the Massachusetts payback
This is simple payback before incentives for the typical Massachusetts system, bought outright with no battery, from our per-utility figures of October 19, 2026.
Typical 8.74 kW system, bought outright
For a purchased system, simple payback before incentives is about 7.5 years statewide, weighted by how many homes each utility serves. Each utility’s figure values every kWh at its own price with the fixed monthly charge taken out, and counts no upkeep, price rises, SMART or state tax credit. Shade and a town light plant can stretch it; light plants are not in our figures. For the long-term view, see Are Solar Panels Worth It in Massachusetts?
A battery adds income, and its own costEnrolled in ConnectedSolutions, a battery adds about $1,200 to $1,375 a year before tax. The battery’s price has to come out of that too, so it does not shorten payback the way the payment suggests.
What $3.02 a watt buys in Massachusetts, 5 kW to 12 kW
The EcoGen Index prices a typical 8.74 kW Massachusetts system at $26,395. Installer quotes usually run $3.00 to $3.40 per watt, so the ranges below are quote ranges. To see how Massachusetts stacks up, browse our national cost of solar overview.
Quote ranges at $3.00 to $3.40 per watt installed, before incentives. Real quotes vary by roof, equipment and installer.
Less sun means more panels per kWhMassachusetts averages 3.8 to 4.2 peak sun hours a day, lower than most states. A system here needs more panels to make the same yearly output, which is one reason gross costs run higher.
The Massachusetts incentive stack that replaced the 30% credit
No federal credit on systems you buy or finance in 2026The One Big Beautiful Bill Act ended the 30% Residential Clean Energy Credit (Section 25D) for systems installed after December 31, 2025. On a lease, the installer claims the 30% Section 48E commercial credit and may pass some of it to you through a lower monthly rate.
15% of system cost, capped at $1,000 (MGL Ch. 62, § 6(d)). Purchase or loan only, not leases or PPAs. Carry it forward up to 3 years if your tax is under $1,000.
$0.03 per kWh for 20 years, paid by National Grid, Eversource or Unitil. The rate is locked at enrollment.
Exports earn the supply, distribution, transmission and transition rates. Credits roll over month to month with no yearly expiry. Systems up to 25 kW AC (cap-exempt threshold raised in February 2025).
$275 per kW of average summer performance for enrolled batteries on your utility’s approved list: Tesla, Enphase, SolarEdge, FranklinWH, Generac, Sonnen and Emporia.
No 6.25% sales tax on solar equipment. It applies automatically, and your quote should reflect it.
The added home value is exempt from property tax for 20 years under MGL Ch. 59, § 5, for systems up to 25 kW.
For every program in detail, see our Complete Guide to Massachusetts Solar Incentives.
Snow racking, SMART paperwork and pre-1980 houses: the Massachusetts price drivers
Equipment is only part of the price. A few Massachusetts factors shape what you actually pay.
+What pushes a Massachusetts quote up
- Snow load engineeringSteeper pitch, snow-shedding mounts and a structural check of your roof. Panels certified for New England conditions may have different specs.
- SMART 3.0 interconnectionThe application runs through both the utility and DOER. Installers who aren’t registered SMART 3.0 partners cause delays that cost you months of payments.
- PermittingTown timelines vary a lot, and utility review adds time. Installers build that into quotes.
- Older homesMany homes predate 1980. Non-standard framing may need a structural assessment, and a 100-amp panel usually needs a 200-amp upgrade.
Panel upgrade: $1,500 to $4,000
−What pulls it down
- Sales tax exemptionNo 6.25% sales tax on the equipment.
About $1,750 on a $28,000 system - Near-retail net meteringThe credit has held firm here while other states pulled back.
- High power ratesAt 30¢ to 34¢ per kWh, each watt of hardware returns roughly double what it does in lower-rate states.
Who collects the SMART check: cash, loan or lease in Massachusetts
How you pay decides who gets the SMART income. Buy the system and it comes to you. Lease it and it goes to the installer.
Pay cash
You own the system
Upfront
The full price, about $26,400 for the typical 8.74 kW system at the Index price.
Monthly
Nothing. You keep 100% of net metering savings.
Credits
$1,000 state credit, no sales tax, SMART checks paid to you.
Watch out for
No 25D credit, so the upfront cost is higher than before 2026.
The best long-term return.
Solar loan
You own the system
Upfront
Little or nothing, through MassSave partner programs and third-party lenders.
Monthly
A loan payment, higher than pre-2026 projections without a 25D lump sum.
Credits
$1,000 state credit, SMART checks paid to you.
Watch out for
Make sure the payment is truly lower than your current bill before you sign.
Ownership and SMART income without cash.
Lease or PPA
The installer owns the system
Upfront
$0.
Monthly
A monthly fee or a price per kWh.
Credits
The installer claims the 30% Section 48E credit (active through 2027) and passes some of it on.
Watch out for
SMART income goes to the installer, and the state tax credit doesn’t apply.
No upfront cost, no SMART income for you.
Before you sign a leaseAsk the installer to show how the SMART 3.0 base rate ($0.03 per kWh) is reflected in your per-kWh price. If it isn’t, you are subsidizing their SMART income. For $0-down options, see How to Get Free Solar Panels in Massachusetts.
Four Massachusetts homes where the income stack falls short
Not every Massachusetts home is a good fit. Think twice if one of these is true:
- Your utility is a Municipal Light Plant. MLPs don’t have to offer net metering or SMART, so most of the income above may not apply.
- Your roof needs replacing within 5 to 7 years. Removing and reinstalling the panels typically adds $3,000 to $6,000, which solar warranties won’t cover.
- Trees shade the roof in the afternoon. Suburban canopy can cut output by 30% to 40% on a roof that looks fine.
- Your monthly bill is under $100. The system will be small, savings narrow and payback longer. The incentives still help, but there’s less to work with.
Five questions that test a Massachusetts installer’s SMART know-how
The regulatory side of Massachusetts solar is more involved than in most states. Before you sign, ask:
- Are you a registered SMART 3.0 installer? Ask for the DOER registration number. An installer not currently on 225 CMR 28.00 shouldn’t handle your enrollment.
- Do you manage the annual Program Year Report filings? SMART has ongoing reporting. Errors cost homeowners their monthly payments.
- Do you hold both a Construction Supervisor License (CSL) and a Home Improvement Contractor (HIC) registration? Massachusetts requires both for installs involving structural work.
- Do you offer ConnectedSolutions battery enrollment? The installer needs an active relationship with National Grid’s or Eversource’s demand response programs.
- Do you provide a snow load production guarantee? A system without the right pitch can sit under snow for weeks. Get it in writing.
For more on choosing an installer, see Top Solar Companies in Massachusetts.
Get Massachusetts quotes before the SMART cap fills
SMART 3.0 closes to new applicants once its 600 MW cap is reached. Enter your ZIP code to compare installers and model your own savings.
- Quotes built for your roofEach quote is designed around your home and your bills.
- Check the providerVerify licensing, insurance and warranty terms before signing.
- No cost, no pressureComparing quotes is free, and you are never obliged to sign.
More Massachusetts solar guides
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Frequently asked questions
Do solar panels work in Massachusetts winters?
Yes, with the right design. Cold temperatures actually improve panel efficiency. The main issue is snow coverage. A properly pitched system with snow-shedding racking clears quickly after a storm. Any production estimate that doesn’t account for seasonal snow cover is too optimistic.
What is the payback period for solar in Massachusetts?
About 7.5 years statewide for a typical system you own, as simple payback before incentives, and 5.9 to 8.1 years by utility: 8.1 at Eversource, 7.0 at National Grid, 6.1 at Nantucket Electric and 5.9 at Unitil. A battery enrolled in ConnectedSolutions earns about $1,200 to $1,375 a year on top, but the battery’s own cost comes out of that, so it does not shorten payback on its own. MLP customers should verify their utility’s net metering policy before using these figures.
What happens to my SMART payments if I sell my home?
SMART payments are tied to the system, not the owner. If you sell, the new homeowner takes over the payments for the remaining term, which can be a selling point. Your installer should document this clearly in your Statement of Qualification paperwork.
Do I need planning permission to install solar in Massachusetts?
Most residential installations don’t require planning permission beyond a standard building permit. Historic districts are the main exception. If your home is in a designated historic area, additional review may be required, and timelines may be extended.
Can I get solar if I have a homeowners association (HOA)?
Massachusetts General Laws Chapter 40A prohibits HOAs from banning solar installations outright or imposing requirements that make installation unreasonably difficult. Your HOA can have input on aesthetics, but cannot block a properly permitted system.
How we calculate these costs
The $3.02 per watt is Massachusetts’ figure in the EcoGen Solar Cost Index (September 2026 Edition): the installed price per watt, built from the Department of Energy’s cost benchmark adjusted for local labor wages, run through our cost model, calibrated against current marketplace quotes and checked against installed prices from Berkeley Lab. It is 4.5% above the $2.89 national figure and tied 38th lowest of 51. The typical system size is Berkeley Lab’s 2025 median for Massachusetts single-family installs (8,306 systems); the typical cost is that size times the price per watt. Payback is simple payback before incentives for a purchased system with no battery, from our per-utility figures of October 19, 2026 (EIA prices, August 2025 to July 2026). Real quotes vary by roof, equipment and installer.
Sources (7)
- DOER, 225 CMR 28.00, SMART 3.0 Program Regulations: mass.gov
- Eversource, 2025 Rate Filing (MDTE Docket): eversource.com
- National Grid, 2025 Rate Hike Filing: nationalgridus.com
- National Grid / Eversource, ConnectedSolutions VPP Program: nationalgridus.com
- IRS, Section 25D Termination (OBBB Act): irs.gov
- EIA, Massachusetts State Energy Profile: eia.gov
- DSIRE, Massachusetts Solar Programs: programs.dsireusa.org
