A worked example: 8 kW in Massachusetts
An 8 kW system — about 19 × 425-watt panels — at Massachusetts's assumed installed cost of $2.80–$3.60 per watt runs roughly $22,400–$28,800 before incentives. At about 1,160 kWh of production per installed kW, it would generate around 9,280 kWh per year. Valuing self-consumed electricity at the assumed $0.30/kWh retail rate and exports conservatively, first-year savings land near $2,294 — a simple payback of roughly 10–13 years.
There is no federal tax credit in that math: the Section 25D residential credit ended for systems installed after December 31, 2025. State or utility incentives, where they exist, would shorten payback from here.
Average cost of solar panels in Massachusetts by system size
Most Massachusetts quotes land between 6 and 12 kW. At the state's assumed $2.80–$3.60 per watt, here is what each size costs to install, what it produces, and how long it takes to pay for itself on electricity savings alone — no incentives applied.
| System size | Panels | Installed cost | Annual production | Est. payback |
|---|---|---|---|---|
| 6 kW | 15 | $16,800–$21,600 | 6,960 kWh | 10–13 yrs |
| 8 kW | 19 | $22,400–$28,800 | 9,280 kWh | 10–13 yrs |
| 10 kW | 24 | $28,000–$36,000 | 11,600 kWh | 10–13 yrs |
| 12 kW | 29 | $33,600–$43,200 | 13,920 kWh | 10–13 yrs |
Size should follow your electricity usage, not a round number — these are reference points, not a recommendation. Note that cost per watt rises on smaller systems, because permitting, labor and the inverter do not shrink with the array.
What solar costs per kWh in Massachusetts
Spread across a 25-year life, with 0.5%/yr panel degradation and no financing cost, solar electricity in Massachusetts works out to roughly 10.2¢–13.2¢ per kilowatt-hour. The Massachusetts retail rate this page assumes is 30.0¢. That gap — not the sticker price — is what determines whether solar pays here, and it is why a sunnier state with cheap electricity can be a worse investment than a cloudier one with expensive electricity. See how every state compares on cost per kWh.
Net metering and export rates in Massachusetts
Massachusetts offers retail-rate net metering for typical residential systems, with credits that carry forward month to month.
Export rules are worth reading as an incentive, because they set what every kilowatt-hour you do not use on site is worth — see how Massachusetts compares with every other state on net metering.
Massachusetts solar incentives
Massachusetts offers a 15% state income tax credit up to $1,000, the SMART performance incentive in eligible utility territories, and sales/property tax exemptions.
The most valuable program is 15% state tax credit plus the smart performance incentive. With no federal credit for 2026 installs, state and utility programs are now the whole picture — see the full Massachusetts incentives guide.
What changes a Massachusetts solar quote?
Equipment, roof condition, electrical upgrades, permitting, labor, system size, batteries and financing can all change the installed price. Savings also depend on the specific utility rate, how much solar electricity the home uses directly, and what the utility pays for exports.
Frequently asked questions
What is the average cost of solar panels in Massachusetts?
The average installed cost in Massachusetts runs $2.80–$3.60 per watt before incentives, which puts a 6 kW system at $16,800–$21,600, an 8 kW at $22,400–$28,800, and a 10 kW at $28,000–$36,000. Spread over a 25-year life, that works out to about 10.2¢–13.2¢ per kilowatt-hour, against a Massachusetts retail rate assumed at 30.0¢.
How much does it cost to install solar panels in Massachusetts?
Installation is not priced separately — the $2.80–$3.60 per watt above is a turnkey figure covering panels, inverter, racking, labor, permitting and interconnection. What moves it most in MA is roof complexity, whether the main panel needs upgrading, and whether a battery is included. Expect a site visit to change any online estimate, including this one.
How much do solar panels cost in Massachusetts?
Using an assumed installed cost of $2.80–$3.60 per watt, a typical 8 kW home system in Massachusetts costs roughly $22,400–$28,800 before incentives. Smaller and larger systems scale roughly with size, though small systems cost more per watt.
Is solar worth it in Massachusetts?
With Massachusetts electricity around $0.30/kWh and production around 1,160 kWh per installed kW per year, an 8 kW system could save roughly $2,294 in year one, for a simple payback of about 10–13 years with no federal credit. Whether that is "worth it" depends on your rate plan, export compensation, roof, and how long you plan to stay in the home.
How many solar panels do I need in Massachusetts?
It depends on your electricity usage, not your roof. At Massachusetts's assumed 1,160 kWh per installed kW, a 6 kW system (about 15 panels at 425 watts) generates roughly 6,960 kWh a year, and a 10 kW system (about 24 panels) roughly 11,600 kWh. Compare that against your annual kWh from a utility bill — our calculator sizes it from your monthly bill in about a minute.
Does Massachusetts have net metering?
Massachusetts offers retail-rate net metering for typical residential systems, with credits that carry forward month to month.
What solar incentives does Massachusetts offer in 2026?
Massachusetts offers a 15% state income tax credit up to $1,000, the SMART performance incentive in eligible utility territories, and sales/property tax exemptions. Note that the federal Section 25D residential credit ended for systems installed after December 31, 2025, so state, local and utility programs are now the main incentives for purchased systems.
Is there still a federal solar tax credit in Massachusetts?
No — the 30% federal residential clean energy credit (Section 25D) ended for systems installed after December 31, 2025 under the One Big Beautiful Bill Act. Leased or PPA systems may still benefit indirectly because the system owner can claim the commercial 48E credit through 2027.
Use this as a starting point
This page provides broad state assumptions, not a current market survey or binding quote. Before purchasing, verify applicable incentives, utility rules, installer licensing, warranties and financing terms.
Where these numbers come from
State assumptions are informed by public data and reviewed periodically (September 2026):