The short version
- Typical system here: 7.5 – 9.5 kW, about $18,750 – $33,250 before incentives.
- Serving utility: Eversource.
- Export credit: Incentive programme plus net metering.
- Production: about 1,100 – 1,400 kWh a year per kW installed.
| Peak sun hours per day | 3.9 – 4.6 |
|---|---|
| Annual kWh per kW installed | 1,100 – 1,400 |
| Typical system size | 7.5 – 9.5 kW |
| Residential rates | around 22–34¢ per kWh |
| Export credit regime | Incentive programme plus net metering |
| Serving utility | Eversource |
Why the utility matters more than the city
Eversource sets your export credit, your fixed monthly charges and your interconnection process. Two identical roofs on either side of a service-territory boundary can have quite different payback for that reason alone, which is why a quote built on a statewide average is worth less than one built on your actual tariff.
Alongside export credit, the state runs a capacity-based incentive that steps down in blocks as more solar is installed. Which block you land in depends on when your project is submitted, so two neighbours a few months apart can see different economics.
Programme blocks fill. If a quote leans on an incentive to make the numbers work, confirm the block is still open before signing anything.
What a system costs in Boston
Pricing here sits within the national band of $2.50–$3.50 per watt before incentives, so a typical 7.5 – 9.5 kW system lands around $18,750 – $33,250. Labour rates, permitting fees and whether your electrical panel needs upgrading move that figure more than the panel brand does — the full breakdown is in what solar panels cost.
When it does not pay here
- A roof with under about ten years left. Replacing it later means paying to remove and reinstall the array.
- Heavy shade for much of the day — micro-inverters help at the margin, they do not manufacture sunlight.
- A bill under roughly $80 a month. There is not enough there to offset.
- Moving within about five years. You will likely recover some of it in the sale price, not reliably all of it.
More on that in what to watch for in a solar quote and roof age and solar.
Common questions about solar in Boston
How much do solar panels cost in Boston?
A typical Boston home needs about 7.5 – 9.5 kW, which lands around $18,750 – $33,250 before incentives at the $2.50–$3.50 per watt most US homeowners see. Your roof, your consumption and whether you need a panel upgrade move that more than the equipment brand does.
Which utility serves Boston?
Eversource serves most of Boston. That matters more than the state does: your export credit, your fixed charges and your interconnection process all come from the utility, not from Massachusetts as a whole. Confirm your own account before sizing anything.
How much sun does Boston get?
Around 3.9 – 4.6 peak sun hours a day, which works out to roughly 1,100 – 1,400 kWh a year for every kilowatt installed after normal system losses.
Is solar worth it in Boston?
Massachusetts runs a declining-block incentive and residential rates here are around 22–34¢ per kWh. That makes it a reasonable proposition for a home with an unshaded roof and a bill above roughly $100 a month, and a poor one for a small bill or a heavily shaded roof.
General information for Boston homeowners, not financial, tax or engineering advice. Figures are planning ranges. Utility service territories and export tariffs change — confirm yours against your bill and your utility's current tariff before relying on any of it.