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Get a Free QuoteEversource territory at $0.2836/kWh. Lexington's large colonials, strong sustainability culture, and high property values make it one of the best towns in Greater Boston for solar ROI. SMART 3.0 + ConnectedSolutions eligible.
Eversource territory • SMART 3.0 • ConnectedSolutions eligible • Historic town
2026 Reality: The 30% federal tax credit (Section 25D) expired for homeowners December 31, 2025. All costs in this guide reflect $0 federal credit. Full details
A 12 kW solar system in Lexington costs $37,800-$42,000 in 2026. In Eversource territory at $0.2836/kWh, with SMART income of ~$432/yr and full retail net metering, the investment pays for itself in 7.5-9 years and generates ~$140,000 in savings over 25 years.
Cost Range
$3.15-$3.5/W
Fully installed
Avg System
12 kW
Lexington average
Payback
7.5-9 yrs
Cash purchase
25-Year Savings
~$140K
Estimated total value
Lexington is a historic suburban town with ~34,500 residents, famous for the opening battle of the American Revolution. Its large single-family homes, high property values, and strong sustainability culture make it an ideal market for residential solar.
Population
~34,500
Median Home Value
~$950,000+
Primary Utility
Eversource
Electric Rate
$0.2836/kWh
Typical System Size
10-15 kW
Solar Irradiance
4.2 kWh/m²/day
Costs for different system sizes in Lexington at $3.15-3.50/W. Lexington homes tend to be larger colonials and Capes, so average system sizes run 12 kW or more -- especially for homeowners with EVs or heat pumps.
| System Size | Low Cost | High Cost | SMART 3.0 | Best For |
|---|---|---|---|---|
| 7 kW | $22,050 | $24,500 | ~$252/yr | Smaller colonial / low usage |
| 9 kW | $28,350 | $31,500 | ~$324/yr | Mid-size home / moderate usage |
| 12 kW | $37,800 | $42,000 | ~$432/yr | Typical Lexington colonial |
| 15 kW | $47,250 | $52,500 | ~$540/yr | Large home / EV + battery |
| 18 kW | $56,700 | $63,000 | ~$648/yr | High usage / multi-zone HVAC |
Prices include equipment, labor, permits, and grid interconnection. No federal tax credit included (expired). $1,000 MA state tax credit not deducted.
Roof conditions, historic overlay zones, and tree canopy vary across Lexington neighborhoods. Here is what to expect in each area.
Historic district -- exterior changes near Battle Green may require review by the Historic Districts Commission. Panels approved on non-street-facing slopes. Mostly colonial-era homes with good south-facing roof area.
Mix of mid-century and newer homes. Generally no historic restrictions. Good roof access with less mature tree canopy. Close to Minuteman Bikeway corridor -- eco-conscious homeowner base.
Residential neighborhoods with large lots and generous roof areas. Many 1960s-1980s colonials and split-levels with ideal south-facing slopes. Minimal permitting complexity.
Newer construction and expanded homes. Larger roofs with good solar access. Many homeowners already have EVs and heat pumps. Strong demand for 12-15 kW systems.
Lexington Building Department handles solar permits. The process typically takes 2-4 weeks. Properties in historic districts may need additional review by the Historic Districts Commission.
Your installer assesses roof condition, shade, orientation, and structure. Historic district status identified early for Commission review if needed.
Application to Lexington Building Department with electrical and structural plans. Historic review runs in parallel if applicable.
Typical installation 1-3 days. Electrical and building inspection by the Town of Lexington.
Eversource approves grid connection. 2-4 weeks. Net metering activated once approved.
Massachusetts offers one of the strongest solar incentive packages in the country. Here is what Lexington homeowners can stack.
$0.03/kWh for all electricity produced for 20 years. A 12 kW system generates ~$432/yr in SMART income.
~$432/yr
~$8,200 over 20 years
1:1 credit at full retail rate of $0.2836/kWh. Credits roll over monthly and true up in April.
~$4,082/yr
Annual electricity savings (12 kW)
Eversource demand response program. Earn $275/kW summer + $50/kW winter for discharging your battery during peak events.
$3,250/yr
Typical 10 kW battery
15% of system cost, capped at $1,000. Claimed on your MA state tax return (Form 1, Schedule EC).
$1,000
One-time credit
Solar systems are exempt from the 6.25% MA sales tax. Immediate savings at purchase.
~$2,494
Savings on typical system
Solar-added value is exempt from property tax for 20 years. With Lexington's high property values ($950K+ median), this exemption is especially valuable.
~$455/yr
20-year exemption (~$9,100 total)
Note: SMART 3.0 adders can increase your income: +$0.04/kWh for battery storage, +$0.05/kWh for low-income households. Adders stack on top of the base rate.
Lexington is in Eversource territory, which offers the highest ConnectedSolutions rates in MA. Solar+battery is a popular upgrade for Lexington homeowners looking to maximize ROI and add backup power for outages.
Summer Revenue
$2,750
$275/kW x 10 kW battery
Winter Revenue
$500
$50/kW x 10 kW battery
Total Annual Revenue
$3,250
10 kW battery in Eversource
Lexington tip: With SMART 3.0 battery adder (+$0.04/kWh) + ConnectedSolutions ($3,250/yr), the battery can pay for itself in 3-4 years. The SMART adder and ConnectedSolutions stack.
Lexington has one of the highest EV adoption rates in Massachusetts. Pairing solar with your EV eliminates the extra electricity cost of charging at home and maximizes your investment.
Average EV adds 3,000-4,000 kWh/year to home electricity use
At $0.2836/kWh, that is $850-$1,135/year in grid charging costs
A 12-15 kW solar system can offset both home and EV consumption
SMART 3.0 pays you $0.03/kWh for every kWh produced -- including what charges your EV
Section 30C EV charger credit still active through June 30, 2026 (up to $1,000)
Three ways to pay for solar in Lexington. PPAs offer $0 down because the third-party system owner claims the commercial Section 48 ITC. Solar loans at 5.5-8% APR through local lenders.
Upfront
~$37,800-$42,000
Monthly
$0
25-yr Savings
~$140K
Ownership
You own it
Best long-term ROI. 7.5-9 year payback. Full SMART income + net metering yours.
Upfront
$0 down
Monthly
~$260-370/mo (5.5-8% APR)
25-yr Savings
~$85-110K
Ownership
You own it
10-25 year terms through local lenders and credit unions. SMART income + net metering offset monthly payments.
Upfront
$0
Monthly
Fixed ~$0.14-0.18/kWh
25-yr Savings
~$40-55K
Ownership
Third party owns
Third-party owner claims Section 48 ITC. You buy power at a discount. Immediate savings.
Section 25D (the 30% residential solar tax credit) expired December 31, 2025 under the OBBBA. Lexington homeowners buying cash or loan receive $0 in federal credit. However, third-party system owners (PPA/lease) can still claim the commercial Section 48/48E ITC -- which translates to lower PPA rates for you.
Read: What happened to the solar tax creditLexington has adopted ambitious climate goals and actively supports residential solar adoption through town-level initiatives.
Climate Action Plan with greenhouse gas reduction targets
Sustainable Lexington Committee promotes renewable energy adoption
Streamlined solar permitting for residential properties
Community Choice Electricity aggregation for competitive green rates
High EV adoption driving larger solar system installations
Town facilities transitioning to renewable energy
Lexington's pro-solar policy environment means faster permitting, strong community support, and a town administration that actively encourages clean energy. The combination of high property values, high electricity rates, and sustainability culture makes Lexington one of the best towns in MA for solar ROI.
How Lexington solar costs compare to neighboring communities. All are in Eversource territory with access to the same state incentives.
| Town | Cost/W | Avg System | Utility | Notes |
|---|---|---|---|---|
| Lexington | $3.15-3.50 | 12 kW | Eversource | Large colonials, historic areas, high EV adoption |
| Winchester | $3.15-3.50 | 11 kW | Eversource | Similar profile, compact town, good roof access |
| Arlington | $3.10-3.45 | 10 kW | Eversource | Slightly smaller homes, denser neighborhoods |
| Burlington | $3.05-3.40 | 11 kW | Eversource | Newer housing stock, fewer historic restrictions |
| Cambridge | $3.15-3.50 | 9 kW | Eversource | Dense academic city, multi-family, historic overlays |
Solar panels in Lexington cost $3.15-3.50 per watt installed in 2026. A typical 12 kW system costs $37,800-$42,000 before MA state incentives. The federal Section 25D residential tax credit expired December 31, 2025 -- homeowners receive $0 in federal credit. Massachusetts state incentives (SMART 3.0, net metering, state tax credit, and tax exemptions) still make solar highly profitable.
Lexington has a Historic Districts Commission that reviews exterior changes in designated areas near Battle Green and along certain streets. However, Massachusetts state law protects the right to install solar energy systems. The commission may request panels be placed on less-visible roof slopes or use lower-profile mounting. Most installations in historic areas are approved with minor adjustments. Your installer should coordinate with the town early in the process.
SMART 3.0 (Solar Massachusetts Renewable Target) pays solar system owners $0.03/kWh for all electricity produced, locked in for 20 years. A 12 kW system in Lexington generates approximately $432/year in SMART income, totaling roughly $8,200 over the program duration. Low-income households qualify for $0.06/kWh (double rate). Battery storage adds $0.04/kWh on top.
ConnectedSolutions is Eversource's demand response program for battery owners. During peak grid events (primarily summer), you discharge your battery to the grid and earn $275/kW in summer and $50/kW in winter. A typical 10 kW home battery can earn $2,750 in summer plus $500 in winter, totaling $3,250/year. Lexington is in Eversource territory, which offers the highest ConnectedSolutions rates in MA.
Lexington adopted a comprehensive Climate Action Plan targeting significant greenhouse gas reductions. The town actively supports renewable energy adoption through streamlined permitting, sustainability committee initiatives, and community outreach. Lexington's high property values and eco-conscious residents make solar installations both financially attractive and culturally supported. The town has been a leader in municipal sustainability efforts in the MetroWest region.
Yes. Without the 25D federal credit, solar payback in Lexington is approximately 7.5-9 years for a cash purchase. This is driven by Eversource's high electricity rate ($0.2836/kWh), SMART 3.0 income ($432/yr for 12 kW), the $1,000 MA state tax credit, 6.25% sales tax exemption, and 20-year property tax exemption. With Lexington's high property values, the tax exemption alone saves ~$455/year. Over 25 years, a typical 12 kW system saves approximately $140,000.
Absolutely. Lexington has one of the highest EV adoption rates in Massachusetts. A typical EV adds 3,000-4,000 kWh/year of electricity consumption, which is why Lexington's average solar system size (12 kW) is larger than nearby cities. A properly sized system can offset both your home electricity and EV charging costs. With Eversource rates at $0.2836/kWh, powering your EV with solar saves roughly $850-$1,100/year versus grid charging.
Massachusetts law exempts solar-added value from property tax assessment for 20 years. In Lexington, where the effective property tax rate is approximately 1.14% and median home values exceed $950,000, this exemption is especially valuable. A $40,000 solar system would normally add ~$455/year to your property tax bill -- instead, you pay $0 additional property tax for 20 years. That is approximately $9,100 in cumulative tax savings on top of your electricity savings.
We will assess your specific roof, orientation, historic district status, and Eversource rate to show you exactly what solar costs and saves for your Lexington home -- including SMART 3.0, ConnectedSolutions, and EV synergy.
Complete hub for MA solar, heat pumps, and utility resources.
Read moreStatewide solar costs and city-by-city breakdown.
Read more$0.03/kWh for 20 years. How to enroll and earn.
Read moreEarn $225-$1,500/yr per battery. Demand response revenue.
Read more1:1 retail credit. Lock in before potential changes.
Read more5.5-8% APR through local lenders and credit unions.
Read more25D expired. What options remain for homeowners.
Read moreCompare utility rates, net metering, and solar economics.
Read moreTrack rate changes across MA utilities since 2020.
Read moreLive installation data, capacity trends, and market stats.
Read moreCurrent wait times, bottlenecks, and how to get connected faster.
Read morePricing: EnergySage Solar Marketplace (January 2026), NuWatt Energy Greater Boston installations.
Utility rates: Eversource residential rate schedule RS, effective February 2026.
SMART 3.0: MassDOER / MassCEC, SMART program guidelines PY2026.
ConnectedSolutions: Eversource demand response program rates, 2026 season.
Tax exemptions: MA Department of Revenue, Lexington Assessor data.
Climate policy: Town of Lexington Climate Action Plan, Sustainable Lexington Committee.