Solar Panels in Boston, Massachusetts

Q: How much do solar panels cost in Boston, Massachusetts?

A typical 8 kW system in Boston costs approximately $22,400 installed (2026 average: ~$2.80/W). The federal solar tax credit (Section 25D) expired December 31, 2025 and is no longer available for residential buyers. Your net cost is $22,366 after the Massachusetts state credit.

Q: Is solar worth it in Boston without the federal tax credit?

Boston produces 1307.3 kWh/kWp/year. An 8 kW system saves $3,259/year and pays back in 4.6 years — even without the expired federal credit. Solar is exceptionally worth it in Boston.

Q: How long is the solar payback period in Boston?

The payback period in Boston is approximately 4.6 years, based on 1307.3 kWh/kWp annual yield (PVGIS v5.3) and a 31.16¢/kWh electricity rate (EIA data, updated April 11, 2026).

Boston receives 1307.3 kWh per kWp of solar panels per year — 14.2% below the US national average of 1,550 kWh/kWp. At Massachusetts's electricity rate of 31.16¢/kWh, an 8 kW system saves roughly $3,259/year and pays back in 4.6 years.

Solar is exceptionally worth it in Boston. Note: The 30% federal solar tax credit (Section 25D) expired December 31, 2025. The numbers below reflect today's actual costs.

Annual yield:1307.3 kWh/kWp

Electricity rate:31.16¢/kWh

Payback:4.6 yrs

Location:42.36°N

Boston Solar at a Glance

Annual solar yield1307.3 kWh/kWp/yr

Optimal tilt angle32° south-facing

Avg. daily sun hours21.1 hrs/day

Electricity rate31.16¢ per kWh

8 kW system cost (2026)$22,400

Massachusetts state credit− $34

Your net cost$22,366

Annual savings$3,259/yr

Payback period4.6 years

Last updated: April 11, 2026 · Sources: PVGIS v5.3, EIA

How Much Solar Power Does Boston Get Each Month?

Monthly solar yield (kWh per kWp installed) based on PVGIS satellite data for 42.36°N, 71.06°W.

120

127

129

122

134

133

117

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Best month: 134.2 kWh/kWp (Jul)Worst month: 67.7 kWh/kWp (Dec)Monthly avg: 109 kWh/kWp

Live Solar Forecast for Boston

Real-time generation estimate for an 8 kW system based on today's weather forecast. Data: forecast.solar.

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Is a Home Battery Worth It in Boston?

A battery stores excess midday solar for use at peak evening hours. At 31.16¢/kWh in Boston, here is the math for the two most popular options.

Tesla Powerwall 3

Capacity

13.5 kWh

Installed cost

$11,500

Annual savings

$1,228

Payback

9.4 yrs

10-year value: $12,280 · Based on 365 cycles/yr, 31.16¢/kWh, 80% usable capacity. Does not include backup value or utility TOU rate savings.

Generic LFP 10 kWh

Capacity

10 kWh

Installed cost

$8,000

Annual savings

$872

Payback

9.2 yrs

10-year value: $8,720 · Based on 350 cycles/yr, 31.16¢/kWh, 80% usable capacity. Does not include backup value or utility TOU rate savings.

Battery ROI improves significantly in states with Time-of-Use (TOU) rates where peak electricity can cost 2–3× the off-peak rate. California (PG&E, SCE, SDG&E), New York (ConEd), and Massachusetts (Eversource) have the strongest TOU incentives for battery storage.

What Are the 25-Year Solar Savings in Boston?

Based on 1307.3 kWh/kWp/yr yield, 31.16¢/kWh electricity rate, and a 2026 system cost of $2.80/W. Federal tax credit expired Dec 31, 2025 — not included.

System cost

$22,400

Installed, 8 kW

State credit

−$34

Massachusetts only

Net investment

$22,366

Your actual cost

25-yr savings

$77,401

Est. lifetime benefit

Federal Solar Tax Credit Update: The 30% residential solar tax credit (Section 25D) expired on December 31, 2025 under the One Big Beautiful Bill. Cash and loan purchases no longer qualify for the federal credit. State and local incentives below may still apply — check with your installer.

What Solar Incentives Are Available in Boston, Massachusetts?

The federal ITC expired in 2025. These state and utility incentives still apply in Massachusetts.

Massachusetts State Tax Credit

0% of cost back on your state income taxes.

Property Tax Exemption

Massachusetts exempts the solar-added home value from property taxes. A $22,400 system won't raise your tax bill.

Sales Tax Exemption

Solar equipment is sales-tax exempt in Massachusetts — saving you hundreds at purchase.

SREC / Renewable Energy Credits

Massachusetts has an active SREC market. Earn certificates for every MWh produced and sell them for additional income.

Net Metering

Full retail net metering through Eversource, National Grid, Unitil. Virtual net metering available for off-site solar.

Utility & Local Programs

SMART program ($0.10–0.20/kWh × 10 yrs), 15% state tax credit, MassSave 0% loans

See all Massachusetts incentives Solar learning guides

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Solar Panels in Boston: Frequently Asked Questions

How much do solar panels cost in Boston, Massachusetts in 2026?

In Boston, a typical 8 kW solar system costs approximately $22,400 installed (at ~$2.80/W, the 2026 US average). The federal solar tax credit expired December 31, 2025, so that 30% rebate is no longer available for residential cash or loan purchases. Massachusetts's state tax credit saves an additional $34, bringing your net cost to $22,366. Prices vary by installer, panel brand, and roof complexity.

Is solar worth it in Boston without the federal tax credit?

Boston generates 1307.3 kWh per kWp annually — 14.2% below the US average. At Massachusetts's electricity rate of 31.16¢/kWh, an 8 kW system saves roughly $3,259/year and pays back in about 4.6 years — even without the expired federal credit. Solar is exceptionally worth it in Boston.

How much electricity do solar panels produce in Boston?

In Boston, each kW of solar panels produces approximately 1307.3 kWh per year. An 8 kW system generates about 10,458.4 kWh annually — enough to cover the average Massachusetts household's electricity use. Peak production hits 134.2 kWh/kWp in Jul, with the lowest output of 67.7 kWh/kWp in Dec. Data source: PVGIS v5.3 satellite radiation model.

What solar incentives are available in Boston, Massachusetts?

the expired federal tax credit (Section 25D) expired December 31, 2025 and is no longer available for residential buyers. Massachusetts still offers a state tax credit of 0% (up to $34). Massachusetts also exempts solar systems from property tax assessments. Sales tax on solar equipment is waived in Massachusetts. Net metering and local utility programs may provide additional savings.

How long is the solar payback period in Boston?

In Boston, the average payback period for an 8 kW solar system is approximately 4.6 years. This is based on 1307.3 kWh/kWp annual yield (PVGIS data), a 31.16¢/kWh electricity rate (EIA 2026 data), and an $22,400 installed cost. After payback, the system produces free electricity for 15–20 more years.

Environmental Impact & Home Value in Boston

An 8 kW solar system in Boston produces roughly 10,458.4 kWh/year. Here is what that means beyond your electricity bill.

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CO₂ avoided per year

4.0 tonnes

4,037 kg · EPA grid avg 0.386 kg/kWh

🌳

Tree equivalent

185 trees

Trees needed to absorb same CO₂ annually

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Home value boost

+$1,546

Avg +6.9% (Lawrence Berkeley Lab / Zillow data)

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US homes powered

Avg US home uses 10,632 kWh/yr (EIA 2024)

How Many Solar Panels Do You Need in Boston?

The right system size depends on your annual electricity usage and how much of your bill you want to offset. In Boston, where annual solar yield is 1307.3 kWh per kWp, here is what different households typically need:

Annual usage	System size	Panels (400 W)	Est. cost	Annual savings
6,000 kWh Small home	4.6 kW	12 panels	$12,880	$1,870/yr
10,800 kWh Average home	8.3 kW	21 panels	$23,240	$3,365/yr
15,000 kWh Large home	11.5 kW	29 panels	$32,200	$4,674/yr
20,000 kWh Large + EV	15.3 kW	39 panels	$42,840	$6,232/yr

Costs based on $2.80/W installed (2026 US average). Panel count assumes 400 W modules. Savings based on current 31.16¢/kWh rate. State incentives not included — see above for Massachusetts credits.

BostonSolar Resources & 2026 Incentives

Key information for homeowners in Boston going solar in 2026 — after the federal 30% tax credit expired December 31, 2025.

⚡ Federal Tax Credit Status (2026)

The 30% Section 25D residential solar credit expired December 31, 2025. An 8 kW system in Boston costs $22,366 after a $34 Massachusetts state credit. The commercial Section 48 credit (for businesses, landlords) was not affected.

IRS Residential Clean Energy Credit →

🔌 Net Metering in Massachusetts

Full retail net metering through Eversource, National Grid, Unitil. Virtual net metering available for off-site solar.

DSIRE — Massachusetts Incentive Database →

🏛️ Massachusetts State Incentives

SMART program ($0.10–0.20/kWh × 10 yrs), 15% state tax credit, MassSave 0% loans

✓ Property tax exempt✓ Sales tax exempt✓ SREC market active

📚 Authoritative Sources