Solar Panel Installation Cost in Boston, MA

Boston is served mostly by Eversource Energy (formerly NSTAR) with some areas under National Grid. Despite being in New England, Massachusetts is one of the best states for solar economics in the entire country. The reason is not sunshine. It is a combination of very high electricity rates, generous state programs, and SREC-like value through the SMART program.

What makes Boston work for solar: • Eversource rates are among the highest in the US, ranging from $0.25 to $0.35 per kWh depending on your supply contract • Massachusetts SMART program (Solar Massachusetts Renewable Target) pays you per kWh generated over 10 years • 15% state solar tax credit (capped at $1,000) • Net metering with virtual net metering option • Property tax exemption for 20 years • Sales tax exemption on solar equipment • The federal 30% ITC expired December 2025

Boston gets about 4.2 to 4.6 peak sun hours per day. That is not great. But when you are displacing $0.30 per kWh electricity and getting SMART payments on top, the math works out better than in many southern cities with cheaper power.

Boston averages 4.2 to 4.6 peak sun hours per day. A 7 kW system produces about 8,200 to 9,800 kWh per year.

New England weather factors: • Snow coverage reduces production in winter (3 to 7% annual loss) • Nor'easters can dump heavy wet snow that takes longer to slide off panels • Boston's coastal position means fog and marine haze reduce production on some days • Cool temperatures improve panel efficiency when the sun is shining

The economics compensate for the weather: displacing $0.30+ per kWh electricity adds up fast, and SMART payments provide additional income that most states do not offer.

Boston solar incentives:

Eversource / National Grid: • Net metering at or near retail rate. Massachusetts net metering rules are among the strongest in the country • Combined rates of $0.25 to $0.35 per kWh make every kWh of solar very valuable • Virtual net metering allows community solar participation

SMART Program: • Massachusetts's primary solar incentive in 2026 • Provides fixed per-kWh payments for 10 years based on your system's generation • Payment rates vary by utility territory, system size, and program block • For Eversource territory, SMART rates have been in the $0.05 to $0.12 per kWh range (check current block availability) • This is in addition to net metering credits, so you earn both

Massachusetts state incentives: • 15% state income tax credit for solar (capped at $1,000). Small but stackable • Property tax exemption: 100% for 20 years from installation date • Sales tax exemption on solar equipment • Alternative Portfolio Standard (APS) certificates have some value but less than SRECs

Federal: 30% ITC expired December 2025.

Boston installation notes:

Permitting: Boston's Inspectional Services Department handles solar permits. Massachusetts has a standardized solar permitting process that most cities follow. Processing takes 1 to 3 weeks.

Historic districts: Large parts of Boston (Back Bay, Beacon Hill, South End, Charlestown) are historically designated. Solar installations in these areas need approval from the Boston Landmarks Commission. Panels facing the street may be restricted. Many homeowners place panels on rear-facing roofs.

Triple-deckers: Boston's iconic triple-decker homes are common in Dorchester, Roxbury, and South Boston. Solar on triple-deckers works well because the flat or low-slope roofs provide good exposure, and the building owner can offset electricity for all units. Condo situations complicate ownership.

Installer market: Massachusetts has one of the most mature solar markets in the US. Boston Solar, SunBug Solar, Sunrise Solar Solutions, and national brands all compete here. The market is competitive so prices tend to be reasonable despite the high cost of living.