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Get a Free QuoteBuying solar for the first time in Massachusetts? This 12-step checklist walks you through every decision — from checking your utility type to signing the contract. No federal tax credit exists for homeowners in 2026. These are the steps that actually matter.
Section 25D was eliminated by the OBBBA (signed July 4, 2025) and expired December 31, 2025. Homeowners purchasing solar with cash or a loan receive zero federal tax credits. Massachusetts state incentives (SMART 3.0, net metering, state tax credit, tax exemptions) remain the primary financial drivers for solar in 2026.
Buying solar panels is one of the largest home improvement investments you will make. A typical Massachusetts system costs $33,000-$37,400 in 2026, and the decisions you make during the buying process determine whether you get a system that pays for itself in 8 years or one that drains your bank account for 25.
The solar market in Massachusetts changed dramatically after the federal residential tax credit (Section 25D) expired on December 31, 2025. Companies that built their entire sales pitch around a 30% tax credit savings are scrambling to adjust. Some have not updated their marketing. Others are deliberately misleading first-time buyers who do not know the credit is gone.
At the same time, Massachusetts still has exceptional state-level incentives: SMART 3.0 pays you $0.03/kWh for 20 years, 1:1 net metering offsets your bill at full retail rate, and tax exemptions save thousands more. Solar is absolutely still worth it in Massachusetts — but only if you avoid the common mistakes that cost first-time buyers thousands of dollars.
This 12-step checklist covers everything from checking your utility type (which determines your incentive eligibility) to reviewing contract terms before signing. Each step includes Massachusetts-specific details, real cost examples, and the exact questions to ask. Check off each step as you complete it using the interactive checklist below.
Check off each step as you complete it. Expand any step for detailed Massachusetts-specific guidance, tips, and the exact questions to ask.
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Your electric utility determines whether you qualify for the SMART program, net metering, and ConnectedSolutions. This is the first thing to verify.
Your bill data determines what size solar system you need and what your savings will be. Gather 12 months of bills or download usage history from your utility portal.
Your roof's age, condition, orientation, and shading directly affect whether solar makes sense and how much energy your system will produce.
Massachusetts has some of the best state-level solar incentives in the country, even without the federal residential tax credit (which expired December 31, 2025).
Getting at least three quotes from different installers is the single most important step in avoiding overpaying or choosing a bad company.
How you pay for solar dramatically affects your total cost. Cash is cheapest but not always practical. Understand the hidden costs in each financing option.
Not all solar quotes are honest. Learn to spot the warning signs that indicate a company is overcharging, oversizing, or outright misleading you.
Massachusetts has specific licensing requirements for solar installers. Verify credentials before signing anything.
The contract is where promises become legally binding. Read every page before signing. Key terms to verify include escalator rates, warranty, and SMART enrollment.
Mass Save offers a free Home Energy Assessment for all Massachusetts residents. This assessment can unlock additional incentives and should be completed before solar installation.
After signing, the typical timeline from contract to Permission to Operate (PTO) is 6-12 weeks. Understand each step so you know what to expect.
Before you sign, verify you have completed every step above. This is a 25+ year investment. Take your time and be thorough.
These are the errors we see most often from first-time buyers in Massachusetts. Each one can cost thousands of dollars.
If you are served by a Municipal Light Plant (MLP), you do not qualify for the SMART program or standard net metering. The economics of solar on an MLP can be drastically different. Some MLP customers have gone solar expecting SMART payments and 1:1 net metering only to find out their town offers neither.
Section 25D expired December 31, 2025. There is no federal residential solar tax credit for homeowner-owned systems in 2026. A company advertising this credit is inflating your projected savings by $10,000 or more on a typical system. When you file your taxes and discover the credit does not exist, you are stuck with the full cost.
A low monthly payment often hides a 25-30% dealer fee embedded in the loan principal. A $35,000 system financed with a 28% dealer fee becomes $44,800 in debt. Compare the cash price ($/W) across all quotes. If the financed amount is much higher than the cash price, dealer fees are the reason.
Solar pricing in Massachusetts varies significantly between companies. The difference between the cheapest and most expensive quote for the same home can be $5,000-$10,000. Getting three or more quotes gives you leverage and helps identify outliers — both overpriced companies and suspiciously cheap ones that may cut corners.
Some companies propose systems 30-50% larger than your usage to maximize their revenue. While net metering credits excess production, the value of credits above 100% offset diminishes. A system sized to cover 90-100% of your annual usage is optimal. If a company proposes 15+ kW for a home using 800 kWh/month, ask why.
Side-by-side comparison of an honest Massachusetts solar quote versus a misleading one. Use this as your reference when reviewing proposals.
10.56 kW (24 x Silfab 440W)
$33,800 ($3.20/W)
Enphase IQ8M+ microinverters (25-yr warranty)
$0 (Section 25D expired 12/31/2025)
$0.03/kWh x 12,672 kWh = $380/yr for 20 yrs = $7,600
~$4,549/yr at $0.36/kWh (Eversource)
$1,000
$2,113
8.1 years
25-yr panel, 25-yr inverter, 15-yr workmanship
14.4 kW (32 x generic 450W)
Not shown (only monthly payment: $189/mo)
"Standard inverter system" (no brand specified)
-$13,680 (30% tax credit) [DOES NOT EXIST]
Not mentioned
"Up to $4,500/yr savings"
Not mentioned
Not mentioned
"Pays for itself in 4 years" [impossible without ITC]
"Manufacturer warranty included"
Key difference: The misleading quote shows a $13,680 federal tax credit that does not exist in 2026, does not mention SMART income (the most valuable MA incentive), hides the cash price behind a monthly payment, uses generic equipment language, and claims a 4-year payback that is mathematically impossible without the ITC.
Use this table to evaluate every installer you get a quote from. Items marked “Required” are non-negotiable.
| Criterion | Status | Why It Matters |
|---|---|---|
MA HIC License | Required | Legally required for any home improvement work over $1,000. Verify at mass.gov. |
NABCEP Certification | Preferred | Gold-standard technical certification. Strong positive signal but not legally required. |
General Liability Insurance ($1M+) | Required | Protects you if something goes wrong. Ask for a Certificate of Insurance (COI). |
Workers' Compensation Insurance | Required | Covers workers injured on your property. Without it, you could be liable. |
Google Reviews 4.5+ (50+ reviews) | Preferred | Strong social proof. Be wary of companies with fewer than 20 reviews or below 4.0 stars. |
BBB Rating A- or Higher | Preferred | Indicates complaint resolution track record. Check for any unresolved complaints. |
5+ Local References (within 20 mi) | Required | Recent, local references prove the company has MA experience and satisfied customers. |
SMART Program Registered | Required | Must be registered to enroll your system in SMART 3.0. If not, you lose $7,920+ in income. |
Review every line of your solar contract. These are the specific items that protect you from hidden costs, broken promises, and legal headaches.
System size, panel brand/model, and inverter brand/model specified exactly (no "or equivalent")
Cash price stated clearly, separate from any financed amount
No 30% federal ITC line item (Section 25D expired 12/31/2025)
SMART 3.0 enrollment is the installer's responsibility, with income assigned to you
Escalator rate (lease/PPA only) clearly stated — negotiate below 2% or 0%
Panel warranty: 25-year product + 25-year performance guarantee
Inverter warranty: 25-year (microinverter) or 12-year extendable (string)
Workmanship warranty: minimum 10 years (NuWatt offers 15 years)
Permitting and interconnection included in scope and cost
Production guarantee in writing (specific kWh/year number)
3-day right of rescission acknowledged per Massachusetts law
Cancellation fee and deposit refund terms clearly defined
Honest numbers with no phantom tax credits. This is what first-time buyers should actually expect.
Cost per Watt (Cash)
$3.00 - $3.40/W
Installed, all-in
Typical 11 kW System
$33,000 - $37,400
No federal ITC
Payback Period
7.5 - 8.5 Years
With SMART + net metering
| Financing Option | Typical Rate | Dealer Fee | Total Cost (11 kW) | Payback |
|---|---|---|---|---|
| Cash purchase | N/A | 0% | $34,100 | 7.5 yr |
| HEAT Loan (Mass Save) | 0% | 0% | $34,100 | 7.5 yr |
| Mass Solar Loan / credit union | 5-8% | 0% | $45,000-$52,000 | 8-9 yr |
| Installer loan (low APR) | 1.49% | 25-30% | $52,000-$58,000 | 9-10 yr |
| Lease / PPA | $0.14-$0.18/kWh | N/A | $0 upfront | Immediate savings |
Based on an 11 kW system at $3.10/W. Rates vary by lender and credit score. HEAT Loan requires Mass Save Home Energy Assessment.
Even without the federal residential tax credit, Massachusetts homeowners benefit from one of the strongest state incentive packages in the country. Here is the full stack for a typical 11 kW system.
SMART 3.0 Base Rate
$0.03/kWh for 20 years
~$7,920 total · IOU customers only
SMART Battery Adder
+$0.04/kWh for 20 years
~$10,560 additional · If you add battery storage
Net Metering (1:1)
$0.36-$0.39/kWh credits
~$3,400/yr savings · IOU customers only
State Tax Credit
15% up to $1,000
$1,000 one-time · All MA residents
Sales Tax Exemption
6.25% saved
~$2,131 one-time · At point of purchase
Property Tax Exemption
20-year exemption
~$400/yr saved · Home value increase, no tax hit
ConnectedSolutions
Battery demand response
$225-$1,500/yr · Eversource & National Grid only
Federal Residential ITC
EXPIRED Dec 31, 2025
$0 · Section 25D eliminated by OBBBA
This is the single most important first step because your utility type determines which incentives you qualify for. Massachusetts has two types of electric utilities: Investor-Owned Utilities (IOUs) and Municipal Light Plants (MLPs).
Investor-Owned Utilities (IOUs) include Eversource (largest, serving eastern MA), National Grid (second largest, serving central and western MA), and Unitil (serving a small territory in northeastern MA). If you are served by an IOU, you qualify for SMART 3.0, 1:1 net metering, ConnectedSolutions battery demand response, and all Mass Save programs.
Municipal Light Plants (MLPs)are town-owned utilities. Massachusetts has over 40 MLPs, including Braintree Electric, Belmont Light, Wellesley Municipal Light, Reading Municipal Light, and Holyoke Gas & Electric. MLP customers do NOT qualify for SMART or standard 1:1 net metering. Some MLPs offer their own solar buyback programs, but rates are typically lower ($0.05-$0.15/kWh vs. full retail). This dramatically changes the economics.
How to check:Look at the top of your electric bill. If you see Eversource, National Grid, or Unitil, you are on an IOU. If you see any other name with “Municipal Light,” “Electric Light Department,” or your town name, you are likely on an MLP. You can also check by entering your address on your utility’s website.
Your electric bill tells you three critical numbers: average monthly kWh usage, your electricity rate, and your monthly cost. These numbers determine the optimal system size and your projected savings.
A typical Massachusetts home uses 700-900 kWh per month. Eversource customers pay about $0.36/kWh all-in. National Grid customers pay about $0.39/kWh. If you are planning to electrify your home (adding an EV, heat pump, or heat pump water heater), factor in the additional electricity: an EV adds roughly 300-400 kWh/month, and a heat pump adds 200-500 kWh/month depending on your home size and heating needs.
Pro tip: Download your 12-month usage history from your utility portal. Eversource and National Grid both offer online tools that show your monthly usage in chart form. Give this data to every installer so they size your system correctly. A system sized to offset 90-100% of your annual usage is optimal. Anything above 110% is likely oversized.
Your roof is the foundation of your solar investment. Three factors matter most: age/condition, orientation, and shading. Getting any of these wrong costs you money down the road.
Roof age: Asphalt shingles last 20-30 years. If your roof is more than 15 years old, you should strongly consider replacing it before installing solar. Removing and reinstalling solar panels for a mid-life roof replacement costs $2,000-$5,000. Many homeowners bundle the roof replacement with their solar installation to save on combined labor costs.
Orientation: In Massachusetts, south-facing roofs produce the most energy (100% of potential). Southeast and southwest-facing roofs produce 85-95%. East and west-facing roofs produce 70-85%. North-facing roofs are generally not suitable. Most installers will not propose a north-facing system because the payback period becomes too long.
Shading: Trees, chimneys, dormers, and neighboring buildings can all cast shadows on your panels. Even partial shading on one panel can reduce the output of an entire string (if using a string inverter). Microinverters (Enphase IQ8+) mitigate this because each panel operates independently. Every reputable installer should perform a detailed shade analysis using satellite imagery (Google Project Sunroof, Aurora Solar) or an on-site Solar Pathfinder assessment.
Massachusetts has one of the strongest state incentive packages for solar in the country. Even without the federal residential tax credit (Section 25D expired December 31, 2025), the combination of SMART 3.0, net metering, and tax exemptions makes solar a strong investment.
SMART 3.0 is the single most important incentive. Residential systems 25 kW or smaller earn $0.03/kWh for 20 years. Adders increase this: battery storage adds $0.04/kWh, building-mounted adds $0.03/kWh, and low-income qualification adds $0.03/kWh. With all applicable adders, a system can earn $0.10/kWh. For a typical 11 kW system producing 13,200 kWh/year, the base SMART income is $396/year or $7,920 over the 20-year term.
Net metering provides 1:1 retail rate credits. Every kWh you send to the grid offsets a kWh on your bill at the full retail rate (about $0.36/kWh for Eversource, $0.39/kWh for National Grid). This is one of the best net metering policies in the nation.
Tax exemptions: The $1,000 state income tax credit (15% of cost, capped at $1,000), the 6.25% sales tax exemption (saving ~$2,131 on a $34,100 system), and the 20-year property tax exemption (your home value increases without increasing your property tax bill) combine for over $3,000 in additional savings.
Getting multiple quotes is the most effective way to ensure you pay a fair price and choose a quality installer. The difference between the cheapest and most expensive quote for the same Massachusetts home can be $5,000-$10,000.
What to compare: Price per watt ($/W) is the most important metric. It should include all costs: panels, inverters, mounting, wiring, permitting, labor, and interconnection. A good cash price in Massachusetts in 2026 is $3.00-$3.40/W. Below $2.80/W may signal hidden fees or low-quality equipment. Above $3.60/W is premium territory.
Also compare: panel brand and efficiency (look for 20%+ efficient Tier 1 panels with 25-year warranties), inverter type and warranty length (microinverters preferred for most MA homes), estimated annual production in kWh (should be based on your specific roof, not a generic estimate), and the projected SMART income and net metering savings.
Red flags in quotes:A single bundled price with no itemization. Only showing a monthly payment (not the cash price). Including a 30% federal tax credit line item. Equipment listed as “or equivalent.” A payback period under 5 years (mathematically impossible without the ITC for a cash purchase).
Your financing decision affects the total cost of your solar investment by thousands to tens of thousands of dollars. Cash is cheapest, but several Massachusetts-specific programs make loans very competitive.
The Mass Solar Loan Program offers below-market interest rates through participating lenders. Unlike most installer-offered loans, Mass Solar Loans have zero dealer fees — the amount you finance equals the actual cost of your system. UMassFive Federal Credit Union is a popular participating lender.
The HEAT Loan through Mass Save offers 0% interest for up to 7 years on loans up to $50,000. This is the best financing deal available in Massachusetts, but it requires completing a free Mass Save Home Energy Assessment first and pairing solar with an eligible energy efficiency improvement (insulation, heat pump, etc.).
Watch for dealer fees:Many installer-offered loans embed 15-30% dealer fees in the loan principal. A $35,000 system with a 25% dealer fee becomes a $43,750 loan. The “low APR” rate (1.49%, 2.99%) disguises this. Always compare the cash price to the financed amount. If there is a large gap, dealer fees are the reason.
The four biggest red flags in Massachusetts solar quotes in 2026 are: (1) including a 30% federal residential tax credit that does not exist, (2) high-pressure signing tactics with manufactured deadlines, (3) oversized systems that exceed your usage by 30% or more, and (4) no itemized pricing or refusal to provide a cash price.
Additionally, watch for quotes that do not mention SMART 3.0 income. SMART is the single most valuable state incentive, and if an installer does not include it in their ROI calculation, they either are not SMART-qualified (a disqualifying factor) or are deliberately omitting it to make competing quotes look worse.
Do not take an installer’s word for their credentials. Verify independently. Every solar installer in Massachusetts must hold a Home Improvement Contractor (HIC) license — check it at mass.gov. Ask for their Certificate of Insurance showing general liability ($1M minimum) and workers’ compensation coverage.
Beyond legal requirements, look for NABCEP PV Installation Professional certification, which indicates advanced technical competence. Check Google reviews (4.5+ stars with 50+ reviews), BBB rating (A- or higher), and search the Massachusetts Attorney General’s consumer complaint database. Ask for and actually call 5+ references from installations completed within the past 12 months and within 20 miles of your home.
The contract is where a company’s verbal promises either become legally binding or quietly disappear. Request a copy of the contract at least 48 hours before the signing appointment. If a company refuses to provide the contract in advance, that is a red flag.
For leases and PPAs, the most critical term is the annual escalator rate. A 2.9% escalator means your $0.15/kWh PPA rate becomes $0.30/kWh by year 25 — potentially more expensive than your utility. Negotiate for 0% or below 2%. Also confirm: who receives SMART income (for leases/PPAs, it typically goes to the system owner), what the early termination fee is, and how the lease/PPA transfers if you sell your home.
Before finalizing your solar system size, schedule a free Mass Save Home Energy Assessment. This 2-3 hour assessment identifies insulation and air sealing improvements that reduce your energy usage. Lower usage means a smaller, cheaper solar system that still meets your needs.
The assessment also unlocks additional incentives: up to 75% off insulation costs (or 100% for income-eligible households), eligibility for the HEAT Loan (0% interest, 7 years, up to $50,000), and potential qualification for enhanced SMART rates ($0.06/kWh for income-eligible households — double the standard rate). Schedule at masssave.com or call 866-527-7283.
After signing your contract, the typical timeline from contract to Permission to Operate (PTO) is 6-12 weeks. The four phases are: permitting (1-3 weeks), installation (1-3 days), inspection and interconnection (2-6 weeks), and SMART enrollment (2-4 weeks after PTO).
The interconnection phase is usually the longest wait. Eversource typically processes interconnection in 3-4 weeks. National Grid can take 4-6 weeks. Your installer should handle all permitting, interconnection, and SMART paperwork. Ask for a written timeline with estimated dates for each milestone, and do not pay your final invoice until PTO is confirmed.
If you have completed steps 1-11, you are now one of the most informed solar buyers in Massachusetts. You know your utility type, your usage, your roof condition, the real incentive numbers, how to compare quotes, and what to look for in a contract.
Before signing, do a final comparison of your top 2-3 quotes. The best quote is not always the cheapest — it is the one that offers the best combination of fair pricing, quality equipment, strong warranty, verified credentials, and clear communication. After signing, your installer should provide a clear timeline, a dedicated project manager, and regular updates at each milestone. Keep copies of everything: contract, warranty documents, permit records, and SMART enrollment confirmation.
No. The Section 25D residential solar investment tax credit was eliminated by the One Big Beautiful Bill Act (OBBBA), signed July 4, 2025. It expired December 31, 2025. Homeowners who purchase solar with cash or a loan in 2026 receive $0 in federal tax credits. The only remaining federal credit is Section 48/48E for commercial and third-party system owners (PPA/lease providers), but the homeowner does not claim that credit. Any company advertising a 30% residential tax credit in 2026 is either uninformed or misleading you.
Residential solar systems in Massachusetts cost $3.00-$3.40 per watt installed in 2026. A typical 11 kW system costs $33,000-$37,400 before state incentives. After the $1,000 state tax credit, 6.25% sales tax exemption (~$2,175 savings), and with SMART 3.0 income ($396/year for 20 years), the effective payback period is 7.5-8.5 years. Boston and Cambridge tend toward the higher end ($3.10-$3.50/W), while Springfield and Worcester are lower ($2.85-$3.30/W).
SMART (Solar Massachusetts Renewable Target) 3.0 is the state's solar incentive program. Residential systems 25 kW or smaller earn $0.03/kWh for 20 years. With adders for battery storage ($0.04/kWh), building-mounted ($0.03/kWh), and low-income status ($0.03/kWh), total SMART income can reach $0.10/kWh. A typical 11 kW system earns approximately $396 per year at the base rate, or $7,920 over the full 20-year term. SMART is only available to customers of Investor-Owned Utilities (Eversource, National Grid, Unitil) — not Municipal Light Plants.
Check the top of your electric bill. If your utility is Eversource, National Grid, or Unitil (Investor-Owned Utilities), you qualify for SMART 3.0 and 1:1 net metering. If you see "Municipal Light" or "Electric Light Department" (e.g., Braintree Electric, Belmont Light, Wellesley Municipal Light), you are on a Municipal Light Plant (MLP) and do NOT qualify for SMART or standard net metering. Some MLPs have their own programs, but terms vary widely.
Get at least 3 quotes from different installers. Compare these five metrics across every quote: (1) $/W (price per watt) — the most important apples-to-apples number, (2) Panel brand, model, and efficiency rating, (3) Inverter type and warranty length, (4) Estimated annual production in kWh with SMART income projection, (5) Total warranty terms (panel, inverter, and workmanship). Never compare based solely on monthly payment — that hides dealer fees and loan terms.
Dealer fees are charges that solar financing companies add to your loan principal. They typically range from 15-30% of the system cost. A $35,000 system with a 25% dealer fee becomes a $43,750 loan. These fees are often disguised by a low APR — a "1.49% APR" loan with a 30% dealer fee costs more in total than a 6.99% APR credit union loan with 0% dealer fees. Always ask for the cash price and the total financed amount separately. If the financed amount is significantly higher than the cash price, dealer fees are embedded.
At minimum, your installer must hold a Massachusetts Home Improvement Contractor (HIC) license — verify it at mass.gov. Beyond that, look for NABCEP PV Installation Professional certification (the industry gold standard), general liability insurance ($1M minimum), workers' compensation insurance, and a surety bond. Check Google reviews (4.5+ stars with 50+ reviews), BBB rating (A- or higher), and the MA Attorney General consumer complaint database. Ask for 5+ local references from the past 12 months.
Yes. Mass Save offers a free home energy assessment for all Massachusetts residents served by IOUs. The assessment identifies insulation and air sealing improvements that reduce your energy usage — meaning you need a smaller, cheaper solar system. It also qualifies you for subsidized insulation and the HEAT Loan (0% interest for 7 years, up to $50,000). If your household income is at or below 60% of State Median Income, you may qualify for 100% free insulation and double SMART rates ($0.06/kWh).
The typical timeline from signed contract to Permission to Operate (PTO) is 6-12 weeks. Permitting takes 1-3 weeks, the physical installation takes 1-3 days, and utility interconnection (the longest step) takes 2-6 weeks. Eversource typically processes interconnection in 3-4 weeks; National Grid can take 4-6 weeks. After PTO, SMART enrollment takes an additional 2-4 weeks. Your installer should handle all paperwork and provide a written timeline with estimated dates for each milestone.
The five most common mistakes are: (1) Not checking whether their utility is an IOU or MLP — MLP customers don't qualify for SMART or standard net metering. (2) Believing a company that advertises a 30% federal tax credit (it expired December 31, 2025). (3) Comparing quotes based on monthly payment instead of $/W and total cost, which hides dealer fees. (4) Not getting at least 3 quotes, leading to overpaying by $3,000-$8,000. (5) Oversizing the system — a system 30% larger than needed wastes money because excess net metering credits have limited value.
5 things to check in any MA solar quote before you sign.
Read guide5 warning signs of dishonest solar companies in Massachusetts.
Read guideDeep dive into solar scam tactics and how to protect yourself.
Read guide7 criteria for choosing the right Massachusetts solar installer.
Read guideCity-by-city pricing with SMART income projections.
Read guideState-backed solar financing with zero dealer fees.
Read guideYou have done the research. Now get a quote that matches what you have learned. NuWatt provides transparent pricing, accurate SMART income projections, and zero hidden dealer fees. No phantom tax credits. No pressure tactics.