Solar in Boston, MA: 2026 Cost, Savings & Payback
Calculate 2026 solar panel cost, payback, and 25-year bill savings in Boston, Massachusetts. Based on 3.8 peak sun hours/day, 27.8¢/kWh average electricity rate, Eversource Energy utility context, and current IRS guidance for the ended federal residential clean energy credit.
Solar in Boston, MA: quick answer
A typical 6kW solar system in Boston costs about $18,780 before local or state incentives. For 2026 installs, the federal residential clean energy credit is modeled as $0, so the estimated cost remains about $18,780 before any local incentive. It produces about 6,658 kWh per year from 3.8 peak sun hours/day, saves about $1,850 per year, and reaches payback in about 10.2 years.
2026 6kW Cost
$18,780
Monthly Savings
$154
Production / kW
1,110 kWh
Panel Count
~15
3.8
Peak Sun Hours/Day
27.8¢
Avg Rate (¢/kWh)
10.2 yr
Payback Period
$54k
25-Year Savings
Boston Solar Overview
Calculate Your Boston Solar Savings
Boston average: $142/mo
South-facing roofs produce the most energy
Add $8,000-$12,000 for whole-home battery backup
Annual Production
kWh/year
Annual Savings
per year
Net System Cost
after 2026 federal credit
Payback Period
break-even time
Bill Offset and Export Assumptions
Current Annual Bill
$1,704
Estimated Usage
6,134 kWh
Bill Offset
92%
Used On Site
92%
Exported production is discounted in this planning model instead of being treated as a guaranteed one-for-one bill credit. For Boston, verify the current Eversource Energy export-credit method and any fixed monthly charges before relying on the payback number.
25-Year Total Savings
$53,559
Monthly Savings
$131
2026 Federal Credit
$0
Cumulative Savings vs System Cost
Cost Breakdown
| Item | Boston | National Avg |
|---|---|---|
| Gross System Cost (6kW) | $18,780 | $17,100 |
| 2026 Federal Residential Credit | -$0 | $0 |
| Net System Cost | $18,780 | $17,100 |
| Cost Per Watt | $3.13/W | $2.85/W |
Solar Potential in Boston
Sun Hours vs National Average
Boston gets 16% less sun than the national average, but high-efficiency panels compensate.
Climate Advantages
- 192 sunny days per year
- Average temperature: 44°F — cooler temps actually improve panel efficiency
- Average roof size: 1,960 sq ft — enough for a 108-panel system
Boston Solar Incentives & Programs
Federal Investment Tax Credit (ITC)
For 2026 planning, JouleIO does not subtract a federal residential clean energy credit. The IRS says the Residential Clean Energy Credit was 30% for eligible property installed from 2022 through December 31, 2025, and is not available for property placed in service after December 31, 2025.
Source: IRS Residential Clean Energy Credit and IRS One Big Beautiful Bill provisions.
Massachusetts State Incentives
Massachusetts SMART program; SRECs at $200-$350/MWh; sales tax exemption
Net Metering — Eversource Energy
Eversource Energy offers net metering in Boston. Earn credits for excess solar energy sent to the grid, reducing your electric bill further.
Environmental Impact in Boston
2.8
Tons CO2 Offset/Year
46
Equivalent Trees Planted
0.6
Homes Worth of Energy
Based on 6,658 kWh annual production with a 6kW system. EPA average: 0.417 metric tons CO2 per MWh, 10,632 kWh per US home.
Solar Energy in Boston, Massachusetts
Boston, Massachusetts receives an average of 3.8 peak sun hours per day, offering adequate solar resources for homeowners looking to reduce their electricity bills. With electricity rates averaging 27.8¢ per kWh from Eversource Energy, well above the national average of 18.56¢/kWh, solar panels offer exceptional savings potential.
A typical 6kW solar system in Boston produces approximately 6,658 kWh per year, saving homeowners an estimated $1,568 annually. The system pays for itself in about 12.0 years, after which you enjoy essentially free electricity for the remaining 13+ years of the system's warranty life.
Boston has a solar penetration rate of 3% — indicating early-stage solar adoption with tremendous growth potential as prices continue to fall. The cost of living index of 141 (national average: 100) means higher electricity costs, which amplifies solar savings.
Other Cities in Massachusetts
Methodology & Solar Data Sources for Boston
How we calculate Boston solar potential and savings: Solar production estimates use NREL's PVWatts calculator methodology, applied to Boston's specific solar irradiance (peak sun hours), tilt angle, and azimuth. Cost figures combine NREL's Annual Technology Baseline for system pricing, ENERGY STAR's database for residential PV averages, and EIA Form 861 utility rate data for Massachusetts.
- Solar irradiance for Boston: based on NREL National Solar Radiation Database (NSRDB) — 30-year average peak sun hours per day.
- System sizing assumes residential rooftop installation with standard 350-400W panels, calibrated to typical Boston household electricity usage.
- Federal tax credit: modeled as 0% for 2026 residential installations because IRS guidance says the Residential Clean Energy Credit is not available for property placed in service after December 31, 2025.
- Net metering assumes 1:1 retail-rate compensation typical in Massachusetts (verify with local utility — some have shifted to net billing or avoided-cost rates).
- System lifetime standard 25 years with annual degradation of 0.5%/year per industry warranty norms.
Authoritative US solar data sources:
- NREL PVWatts Calculator — official US solar production estimator
- NREL National Solar Radiation Database — 30-year solar irradiance data
- IRS Residential Clean Energy Credit — 2026 federal residential credit status
- IRS One Big Beautiful Bill provisions — clean energy credit expiration overview
- DSIRE — State Solar Incentives — searchable database for Massachusetts
- EIA Electric Power Monthly — Massachusetts utility rate data
- ENERGY STAR Solar — efficient solar product database
Solar Disclaimer: Solar savings vary based on roof orientation, shading, system quality, installer markup, financing terms, utility rate plan, and policy changes. Always get 3+ quotes from NABCEP-certified installers and review contracts carefully. Tax credit eligibility depends on tax liability — consult a tax professional.
Reviewed by Brazora Monk · Last updated 2026 · NREL irradiance data per NSRDB latest release
Frequently Asked Questions
How much do solar panels cost in Boston, MA?
The average cost of a 6kW solar panel system in Boston is approximately $18,780 before local or state incentives ($3.13/watt). For 2026 planning, this calculator does not subtract a federal residential clean energy credit because IRS guidance says the credit is not available for property placed in service after December 31, 2025. Massachusetts SMART program; SRECs at $200-$350/MWh; sales tax exemption
How many solar panels do I need in Boston, MA?
A typical 6kW residential solar system in Boston needs about 15 panels if each panel is rated near 400 watts. That system produces about 6,658 kWh per year in this estimate, or roughly 1,110 kWh per installed kW before shading, roof orientation, and inverter losses are customized.
How many peak sun hours does Boston get?
Boston, MA receives an average of 3.8 peak sun hours per day and approximately 192 sunny days per year. While below the national average, solar panels can still provide significant savings due to advancing panel technology.
What is the solar payback period in Boston?
The average solar payback period in Boston is approximately 10.2 years for a 6kW cash-price estimate before local or state incentives. After payback, your solar panels generate essentially free electricity for the remaining warranty life. Over 25 years, bill savings can reach about $63,192 before subtracting installation cost.
Does Boston have net metering?
Yes, Boston has access to net metering through Eversource Energy. This allows you to earn credits for excess solar energy sent to the grid, but the final savings depend on the current utility tariff and fixed monthly charges.
Is solar worth it in Boston, MA in 2026?
It can be. The 10.2-year estimated payback is moderate, so the decision depends on quote quality, financing terms, roof condition, and local incentives. For 2026 installs, JouleIO does not assume a federal residential credit; above-average electricity rates are the main financial drivers.