What solar costs in Massachusetts
The middle half of Massachusetts households who put solar on the roof paid between $3.24 and $4.48 a watt, on 319 reported installations. There is no longer a federal credit to take off that.
The numbers
High electricity prices make solar pay faster, so a red figure in the third box is good news for a solar buyer and bad news every other month of the year.
Holding a quote above $29,920? Installers in Massachusetts price the same system very differently. Two more bids is the cheapest way to find out where yours sits.
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What the roof makes month by month in Boston
A 2.4 to 1 swing across the year, which is fairly typical. Expect to export in summer and import in winter, and check how your utility settles the difference.
Figures are for an 8 kW array at 20 degrees facing south, modelled from NSRDB radiation data at Boston.
What different sizes cost in Massachusetts
| Size | Panels | Price | Output | Year one saving | Payback |
|---|---|---|---|---|---|
| 4 kW | 10 | $14,960 | 5,052 kWh | $1,540 | 9.0 years |
| 5 kW | 13 | $18,700 | 6,315 kWh | $1,925 | 9.0 years |
| 6 kW | 15 | $22,440 | 7,578 kWh | $2,311 | 9.0 years |
| 7 kW | 18 | $26,180 | 8,841 kWh | $2,696 | 9.0 years |
| 8 kWtypical | 20 | $29,920 | 10,104 kWh | $3,081 | 9.0 years |
| 10 kW | 25 | $37,400 | 12,630 kWh | $3,851 | 9.0 years |
| 12 kW | 30 | $44,880 | 15,156 kWh | $4,621 | 9.0 years |
| 15 kW | 38 | $56,100 | 18,945 kWh | $5,776 | 9.0 years |
| 20 kW | 50 | $74,800 | 25,260 kWh | $7,702 | 9.0 years |
Payback is the same at every size because this table holds the price per watt flat at the Massachusetts median of $3.74: price and output both grow in step with the system, so their ratio does not change. Real quotes are not quite linear. Permitting, design and connection cost roughly the same on any roof, so a small system usually costs more per watt and a large one less, and pays back correspondingly later or sooner than shown.
The price is what Massachusetts households actually paid on host-owned systems installed in 2024-2025, as reported to state programmes and compiled by Berkeley Lab, gross of any incentive. Quote marketplaces publish the prices installers offer on their own platforms, which is a different measure from prices paid on contracts that closed, so the two need not match.
19 programmes in Massachusetts
The 30% federal credit ended for installations completed after 31 December 2025. These state, utility and local programmes are unaffected by that, and are now the only thing that reduces the price.
Programme index from DSIRE, N.C. Clean Energy Technology Center, NC State University, licensed CC BY-SA 4.0. “Partial” means it reaches only some utilities or counties. A listed programme can still be closed or out of budget, so check its own page before counting on it.
How Massachusetts ranks
Closest on payback: Hawaii (4.7 yrs), Maine (8.7 yrs), New York (9.7 yrs), Rhode Island (9.7 yrs).
Solar in Massachusetts, answered
How much do solar panels cost in Massachusetts?
An 8 kW system in Massachusetts, roughly 20 panels, costs about $29,920 before incentives. That is based on $3.74 per watt, the median Massachusetts households actually paid across 319 installations reported to Lawrence Berkeley National Laboratory for 2024-2025. The middle half of buyers paid between $3.24 and $4.48 per watt. There is no longer a federal tax credit to subtract from that figure.
Is there still a 30% solar tax credit in Massachusetts?
No. The federal Residential Clean Energy Credit under Internal Revenue Code section 25D was terminated by the One Big Beautiful Bill Act for expenditures made after 31 December 2025, and it did not step down first. A Massachusetts homeowner buying a system with cash or a loan today receives no federal tax credit. Under a lease or power purchase agreement the credit survives as section 48E but belongs to the company that owns the equipment, not to the household. Massachusetts still has 19 state, utility or local programmes covering rooftop solar.
How long do solar panels take to pay for themselves in Massachusetts?
About 9.0 years in Massachusetts. An 8 kW system costs roughly $29,920 and saves about $3,081 in its first year at the state's average residential rate of 30.49 cents per kilowatt-hour (EIA, July 2026). That calculation includes no federal tax credit, because the residential credit ended after 31 December 2025.
How much electricity does a solar panel produce in Massachusetts?
Each kilowatt of panels in Massachusetts produces about 1,263 kilowatt-hours a year, modelled at Boston facing south at a 20 degree tilt using NSRDB radiation data. An 8 kW system therefore makes roughly 10,104 kilowatt-hours a year. The national average is about 1,332 kilowatt-hours per kilowatt installed.
Is solar worth it in Massachusetts?
It depends less on sunshine than on your electricity price. In Massachusetts power costs 30.49 cents per kilowatt-hour (EIA, July 2026), which makes an 8 kW system pay for itself in about 9.0 years and clear roughly $68,599 over 25 years. Solar from your own roof works out at 12.6 cents per kilowatt-hour over its life, against 30.49 cents from the utility.
How many solar panels do I need in Massachusetts?
A typical Massachusetts installation is about 20 panels, which is 8 kW at the 400 watt module that is now standard and needs roughly 440 square feet of roof. To size it to your own use, divide your annual kilowatt-hours by 1,263, which is what each kilowatt of panels produces in Massachusetts each year.
Do solar panels work in winter in Massachusetts?
Yes, but output falls sharply. In Boston a kilowatt of panels makes about 139 kilowatt-hours in Jul and about 58 in Dec, a swing of 2.4 to 1 across the year. A system sized to cover your annual consumption will therefore run a surplus in summer and leave you buying power in winter, so how your utility settles that difference matters as much as the size of the array.
Three competing quotes beat any amount of comparing panel brands
Sales cost and margin are over a third of an installed price in Massachusetts, and they are the part that competition removes. A single quote from whoever reached you first is how people end up in the top quarter of what their neighbours paid.
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Prices and rules change. We will tell you when they do
Berkeley Lab publishes installed prices once a year, the EIA updates electricity rates every month, and Congress changed the tax treatment of all of this in 2025. One email when something on this site actually changes, and nothing else.
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