How many peak sun hours does Boston, MA get?

Boston, MA averages approximately 4.06 peak sun hours per day based on Open-Meteo historical satellite data.

What is the average electricity rate in Boston, MA?

The average residential electricity rate in Boston, MA is approximately $0.224 per kWh (EIA data).

Is solar worth it in Boston, MA?

Based on 4.06 peak sun hours and $0.224/kWh rates, a typical 6kW system in Boston, MA has an estimated payback of 6.2 years and a 25-year NPV of approximately $21,921.

4.06 Peak Sun Hrs $0.224/kWh Massachusetts

Solar Calculator — Boston, MA

Adjust system size and cost. Location data: 4.06 peak sun hours/day, $0.224/kWh average rate.

Data last updated: July 25, 2026

Solar ROI Calculator

Assumes 4.06 peak sun hours, $0.224/kWh, 80% derating, 0.5% annual degradation, 2.5% utility escalation, 4% discount rate. Federal ITC 30% + 15% state applied.

Key Assumptions

Peak Sun Hours (daily avg)	4.06 hrs
Avg. Electricity Rate	$0.224/kWh
Federal Tax Credit	30%
State Tax Credit	15% (Massachusetts)
System Derating	80% (temp, inverter, soiling)
Annual Degradation	0.5%
Utility Escalation	2.5%/year
Discount Rate	4%

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