Solar in Cambridge, MA: 2026 Cost, Savings & Payback
Calculate 2026 solar panel cost, payback, and 25-year bill savings in Cambridge, Massachusetts. Based on 4 peak sun hours/day, 26.9¢/kWh average electricity rate, Eversource Energy utility context, and current IRS guidance for the ended federal residential clean energy credit.
Solar in Cambridge, MA: quick answer
A typical 6kW solar system in Cambridge costs about $18,420 before local or state incentives. For 2026 installs, the federal residential clean energy credit is modeled as $0, so the estimated cost remains about $18,420 before any local incentive. It produces about 7,008 kWh per year from 4 peak sun hours/day, saves about $1,887 per year, and reaches payback in about 9.8 years.
2026 6kW Cost
$18,420
Monthly Savings
$157
Production / kW
1,168 kWh
Panel Count
~15
4
Peak Sun Hours/Day
26.9¢
Avg Rate (¢/kWh)
9.8 yr
Payback Period
$53k
25-Year Savings
Cambridge Solar Overview
Calculate Your Cambridge Solar Savings
Cambridge average: $141/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
$1,692
Estimated Usage
6,283 kWh
Bill Offset
92%
Used On Site
90%
Exported production is discounted in this planning model instead of being treated as a guaranteed one-for-one bill credit. For Cambridge, verify the current Eversource Energy export-credit method and any fixed monthly charges before relying on the payback number.
25-Year Total Savings
$53,184
Monthly Savings
$130
2026 Federal Credit
$0
Cumulative Savings vs System Cost
Cost Breakdown
| Item | Cambridge | National Avg |
|---|---|---|
| Gross System Cost (6kW) | $18,420 | $17,100 |
| 2026 Federal Residential Credit | -$0 | $0 |
| Net System Cost | $18,420 | $17,100 |
| Cost Per Watt | $3.07/W | $2.85/W |
Solar Potential in Cambridge
Sun Hours vs National Average
Cambridge gets 11% less sun than the national average, but high-efficiency panels compensate.
Climate Advantages
- 197 sunny days per year
- Average temperature: 49.8°F — cooler temps actually improve panel efficiency
- Average roof size: 1,588 sq ft — enough for a 88-panel system
Cambridge 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 Cambridge. Earn credits for excess solar energy sent to the grid, reducing your electric bill further.
Environmental Impact in Cambridge
2.9
Tons CO2 Offset/Year
48
Equivalent Trees Planted
0.7
Homes Worth of Energy
Based on 7,008 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 Cambridge, Massachusetts
Cambridge, Massachusetts receives an average of 4 peak sun hours per day, offering adequate solar resources for homeowners looking to reduce their electricity bills. With electricity rates averaging 26.9¢ 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 Cambridge produces approximately 7,008 kWh per year, saving homeowners an estimated $1,557 annually. The system pays for itself in about 11.8 years, after which you enjoy essentially free electricity for the remaining 13+ years of the system's warranty life.
Cambridge has a solar penetration rate of 5.3% — showing growing adoption of residential solar, with significant room for expansion. The cost of living index of 127 (national average: 100) means higher electricity costs, which amplifies solar savings.
Other Cities in Massachusetts
Methodology & Solar Data Sources for Cambridge
How we calculate Cambridge solar potential and savings: Solar production estimates use NREL's PVWatts calculator methodology, applied to Cambridge'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 Cambridge: 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 Cambridge 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 Cambridge, MA?
The average cost of a 6kW solar panel system in Cambridge is approximately $18,420 before local or state incentives ($3.07/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 Cambridge, MA?
A typical 6kW residential solar system in Cambridge needs about 15 panels if each panel is rated near 400 watts. That system produces about 7,008 kWh per year in this estimate, or roughly 1,168 kWh per installed kW before shading, roof orientation, and inverter losses are customized.
How many peak sun hours does Cambridge get?
Cambridge, MA receives an average of 4 peak sun hours per day and approximately 197 sunny days per year. This is near the national average, providing good conditions for residential solar panels.
What is the solar payback period in Cambridge?
The average solar payback period in Cambridge is approximately 9.8 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 $64,456 before subtracting installation cost.
Does Cambridge have net metering?
Yes, Cambridge 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 Cambridge, MA in 2026?
Yes. With a 9.8-year estimated payback and about $64,456 in 25-year bill savings before installation cost, solar can be an attractive investment in Cambridge. For 2026 installs, JouleIO does not assume a federal residential credit; above-average electricity rates are the main financial drivers.