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Get a Free QuoteThe federal tax credit is gone. Electricity rates are climbing. SMART capacity is filling. This guide breaks down exactly when to sign, install, and commission your MA solar system for maximum savings in 2026.
With the federal tax credit gone, prices have adjusted -- there is no reason to wait for "next year's credit." Eversource rates rose 15% in 2025 with more increases expected. SMART 3.0 is active at $0.03/kWh locked for 20 years, but the 3,200 MW capacity cap is filling. Every month without solar means ~$336 paid to your utility instead of yourself. For the best combination of pricing and timing, sign in winter, install in spring, and be generating by June.
The Massachusetts solar market in 2026 is fundamentally different from previous years. Several converging factors make the timing question both simpler and more urgent.
Section 25D expired December 31, 2025. $0 in federal tax credits for homeowner cash or loan purchases. Prices have adjusted accordingly -- the old "wait for next year's credit" logic no longer applies.
Eversource raised rates ~15% in 2025. Analysts project 5-8% annual increases driven by grid modernization, transmission upgrades, and offshore wind procurement charges. Every month you delay means higher bills.
Flat $0.03/kWh incentive locked for 20 years. For a 9 kW system, that is ~$324/year or $6,480 over the full term. The 3,200 MW statewide capacity cap is approaching -- once it fills, this incentive may change.
For PPA/lease customers, the July 4, 2026 begin-construction safe harbor has closed. Projects that incurred 5% of costs or took delivery of equipment on or before that date locked in the longer timing; new starts still qualify but generally place in service by December 31, 2027.
A typical 9 kW system costs $25,650-$31,500 before incentives. Prices are not expected to drop significantly -- tariffs on imported panels and sustained demand are keeping price floors in place.
Every month without solar = ~$336 paid to your utility at current rates. That is money that could be offsetting your system cost through net metering credits and SMART income. Over a 6-month delay, that is ~$2,016 in lost savings.
Each season offers distinct advantages for going solar. Your ideal timing depends on whether you prioritize pricing, installation speed, or immediate production.
January - March
Occasional weather delays; shorter daylight hours mean less immediate production. But your system will be commissioned and ready for the high-production months ahead.
April - June
This is peak season for installers. Book early (January/February) to secure a spring installation slot. Waiting until April to start means you may not get commissioned until June.
July - September
High demand for both roofing and solar crews. Heat can slow installation days. Systems installed mid-summer miss the very peak weeks but still capture strong August/September production.
October - December
Daylight hours are dropping, so immediate production will be lower. But you gain months of savings over waiting until the next spring rush, and your system will be fully operational when spring arrives.
A typical 9 kW system in Massachusetts produces ~10,800 kWh/year. Here is how production distributes across the calendar -- and why it does not matter which month you install.
Key insight: June and July produce nearly 2.5x the electricity of December. But net metering rolls your summer surplus forward to cover winter bills. A properly sized system covers your full annual consumption regardless of when you install.
No matter what month it is, here is your recommended action to start your solar journey with optimal timing.
The cost of waiting is real and measurable
At current Eversource rates, a 9 kW system saves approximately $336/month. A 6-month delay costs ~$2,016 in lost savings. A 12-month delay costs ~$4,035. These are dollars you pay to the utility that you could be keeping.
Beyond national solar trends, these Massachusetts-specific factors should inform your timing decision.
Massachusetts has among the highest electricity rates in the continental US. Eversource, which serves the majority of the state, has followed a steep upward trajectory:
The 2023-2025 figures are lagged statewide annual averages; the 2026 figure is the current Eversource-specific all-in bundled residential rate (delivery + supply + customer charge) you actually see on your bill. Both are all-in, so the latest step partly reflects moving from a statewide average to the current Eversource tariff.
Every 1-cent rate increase adds ~$108/year in solar savings for a 9 kW system.
The SMART program has a statewide capacity cap of 3,200 MW across all three utility territories. As of early 2026:
Once the cap is reached, the $0.03/kWh for 20 years incentive may be reduced or restructured. Locking in now guarantees the current rate.
Massachusetts has a deep pool of licensed solar installers, but seasonal demand creates bottlenecks:
Pro tip: Sign your contract 2-3 months before your target installation date to allow for design, permitting, and scheduling.
Municipal permitting is the biggest variable in your installation timeline. Typical timelines:
Your installer handles the permitting process. Factor your town's timeline into your overall schedule.
Federal tariffs on imported solar panels continue to affect pricing. While domestic manufacturing is ramping up, most residential panels still come from Southeast Asian suppliers subject to trade duties. The current $2.85-$3.50/W pricing reflects these tariffs. Waiting for prices to drop is unlikely to pay off -- tariff policy creates a price floor, and any reductions in panel costs tend to be offset by rising labor and permitting costs. See our solar tariff impact analysis for details.
Here is exactly how much each month of delay costs you, using real Massachusetts rate data for a 9 kW system in Eversource territory.
Note: These figures assume current Eversource rates ($0.37/kWh) and do not account for projected rate increases. With 5-8% annual rate escalation, the actual cost of waiting is higher than shown. The calculation also excludes ConnectedSolutions battery income ($225-$275/kW per summer) and the property value increase from solar installation (typically 3-4% of home value in Massachusetts).
After physical installation, your system needs utility interconnection approval before it can operate. This often-overlooked step adds 2-4 weeks to your timeline and varies by utility.
Online application, meter swap scheduled after inspection
Timing tip: Eversource has streamlined their process. Fastest approvals in Q1 when volume is lower.
Application review, field inspection, meter exchange
Timing tip: National Grid can be slower during peak season (April-August). Winter applications move faster.
Smaller utility, fewer applications, generally faster
Timing tip: Unitil territory (Fitchburg area) typically has the shortest wait times year-round.
Your installer manages the interconnection process for you. For a deeper dive into queue times and what to expect, see our MA solar interconnection queue guide.
Answers to the most common questions about when to go solar in Massachusetts.
There is no single best month -- it depends on your priorities. For the best pricing and fastest scheduling, sign a contract in January or February for a March/April installation. Your system will be producing by peak season. For the best value on the installation itself, fall (October-November) often offers competitive pricing as installers close their year. The worst strategy is waiting indefinitely, because every month without solar means paying full utility rates that are climbing 5-8% annually.
The season affects your installation experience more than your long-term economics. Spring and fall offer the best installation weather. Winter installations are possible during snow-free windows and often come with the best pricing because demand is lower. Summer installations are fine but crews work in heat and demand is high. Over 25 years, the month you install has minimal impact on total lifetime savings -- what matters is that you start sooner rather than later.
The Section 25D residential solar tax credit expired on December 31, 2025. There is $0 in federal tax credits for homeowner cash or loan solar purchases in 2026. However, if you finance through a third-party PPA or lease, the system owner (the solar company) may still claim the Section 48 or 48E commercial Investment Tax Credit, which can lower your PPA rate. July 4, 2026 was the begin-construction safe harbor for the 48/48E credit, not an expiration: PPA/lease systems that had 5% of costs incurred or equipment delivered on or before that date locked in the longer timing pathway, and new starts still qualify if placed in service by December 31, 2027.
Yes. The SMART (Solar Massachusetts Renewable Target) 3.0 Program Year 2026 is active. It provides a flat $0.03/kWh incentive locked for 20 years for residential systems. For a 9 kW system producing ~10,800 kWh/year, that is approximately $324/year or $6,480 over the 20-year term. SMART capacity is approaching the 3,200 MW statewide cap, so there is no guarantee the program continues at current rates indefinitely.
In 2026, residential solar in Massachusetts costs approximately $2.85-$3.50 per watt before any incentives. For a typical 9 kW system, that is $25,650-$31,500. Without the federal ITC, the net cost is higher than in previous years. However, Massachusetts still offers the SMART incentive ($0.03/kWh for 20 years), state sales tax exemption, property tax exemption for 20 years, and net metering at full retail rates ($0.37-$0.48/kWh). At today's higher utility rates, most systems pay back in 6-8 years.
Panel prices are stable at $2.85-$3.50/W in 2026 and not expected to drop significantly in the near term. Meanwhile, Eversource rates rose 15% in 2025 with further increases expected. Every month you wait means paying full retail electricity rates ($0.37-$0.48/kWh) instead of generating your own power. The SMART program capacity cap is approaching, and once it fills, that $0.03/kWh for 20 years disappears. The math strongly favors acting now rather than waiting for marginal price drops.
Rising rates make going solar sooner more valuable. Eversource rates increased approximately 15% in 2025, and industry analysts project 5-8% annual increases going forward driven by grid modernization costs, transmission upgrades, and offshore wind procurement charges. Every month you delay means paying higher rates. A system installed today locks in $0 marginal electricity cost for 25+ years. The longer you wait, the more you pay at escalating rates before your system starts saving.
The Section 48/48E begin-construction safe harbor closed July 4, 2026, and it primarily affects customers considering a Power Purchase Agreement (PPA) or solar lease. Under these arrangements, the solar company owns the system and claims the commercial ITC, passing savings to you through a lower PPA rate. Projects that had incurred at least 5% of project costs or taken delivery of equipment on or before that date locked in the longer timing pathway; new PPA/lease starts still qualify but generally must be placed in service by December 31, 2027. If you are buying your system outright with cash or a loan, this timing does not apply to you -- the residential 25D credit already expired December 31, 2025.
The full timeline from signing a contract to system commissioning typically takes 8-16 weeks in Massachusetts. The breakdown: system design (1-2 weeks), permitting (2-6 weeks depending on your town), installation (1-3 days for most residential systems), utility inspection and meter swap (1-3 weeks), and interconnection approval (2-4 weeks). The biggest variable is permitting -- towns like Boston, Cambridge, and Brookline have longer timelines. Starting in winter or fall, when demand is lower, typically compresses wait times.
Massachusetts winters produce roughly 15-16% of your annual solar output (January through March). While production is lower due to shorter days and lower sun angles, panels actually perform more efficiently in cold temperatures. Snow typically slides off south-facing panels within a day or two. The key advantage of net metering is that your surplus credits from spring and summer carry forward to offset winter grid usage. A properly sized system covers your full annual consumption even though monthly production varies significantly by season.
Dive deeper into the topics that affect your solar decision.
Updated pricing, post-ITC financing options, and payback timelines for Massachusetts.
How SMART 3.0 works, current rates, capacity status, and how to apply.
Eversource, National Grid, and Unitil rate history and projections.
Step-by-step timeline from contract to commissioning in Massachusetts.
How federal trade policy affects panel pricing and supply in MA.
Utility interconnection timelines, process, and how to avoid delays.
Every month of delay costs ~$336 in lost savings at current rates. Electricity rates are climbing, SMART capacity is filling, and panel prices are stable. Get your personalized estimate and lock in today's pricing.
No cost. No obligation. Response within 24 hours.
SMART Program
MA DOER -- Solar incentive program details and capacity status
MA Net Metering Rules
220 CMR 18.00 -- Official tariff regulations
EIA Electric Power Monthly
Federal electricity rate data and projections
DSIRE Database
Database of State Incentives for Renewables & Efficiency
Rate data, program details, and tariff information verified March 2026. Programs and rates are subject to change; confirm current details with your utility or installer.