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The federal residential solar tax credit died on December 31, 2025. Maine homeowners receive $0 from Washington in 2026. And Maine has no state solar rebate either. But CMP rates are up 30%+ — and that is actually the reason solar has never made more sense in Maine. The incentive stack still delivers $20,000-$35,000+ in total value.
This is the honest guide. No outdated ITC claims. No fake savings numbers. Just the real programs, the CMP rate crisis context, and the exact steps to maximize every dollar.
Federal ITC
$0
Expired Dec 31, 2025
Lifetime Stack Value
$35K+
9 kW system, CMP territory
CMP Rate Increase
30%+
Since 2024 ($0.18 to $0.27)
Payback Period
~8-9 yrs
Cash, CMP territory
Quick Answer
The federal residential solar tax credit (Section 25D) expired December 31, 2025. Maine homeowners receive $0 from the ITC in 2026, and Maine has no state solar rebate either. However, surging CMP rates (up 30%+ since 2024) have made the remaining incentive stack more valuable than ever — totaling $20,000-$35,000+ over a system's lifetime. The key programs: Net Energy Billing at 1:1 retail rate ($2,000-$3,500/year), 5.5% sales tax exemption (~$1,500), permanent statewide property tax exemption ($400-$600/year), Efficiency Maine Loan ($7,500 at 5.99%), CMP rate arbitrage (growing value every rate increase), and Propel financing (Day 1 cost at ~70%). Follow the 8-step action plan below to claim every dollar.
Most people think losing the federal tax credit killed Maine solar economics. The opposite is true.
The math: When CMP was $0.18/kWh (2023), the 30% ITC saved ~$8,250 on a $27,500 system. But your annual NEB credits were only ~$1,944/year. Today at $0.27/kWh, NEB credits are ~$2,916/year — an extra $972/year that exceeds the lost ITC within 8.5 years. And rates keep climbing.
Key insight: The payback periods are nearly identical. CMP's 50% rate increase since 2023 has almost entirely offset the loss of the federal ITC. And unlike the ITC (which was a one-time benefit), rate increases keep compounding year after year, making solar more valuable over time.
Before we show you how to maximize what is still available, let us be direct about what is not.
The federal residential solar Investment Tax Credit — the one that gave homeowners 30% back on their solar purchase — is dead. It was eliminated by the One Big Beautiful Bill Act (OBBBA), signed July 4, 2025. There is no pending legislation to reinstate it.
If you buy solar with cash or a loan in 2026, you receive $0 from the federal government.
Unlike Massachusetts (SMART $0.03/kWh + $1,000 tax credit) or New Jersey (ADI $85.00/MWh), Maine does not have a state solar rebate, tax credit, or production payment. Efficiency Maine focuses its rebate programs on heat pumps, not solar panels. This is an honest reality that other solar guides skip over.
Here is the counterintuitive truth: CMP's 30%+ rate increase since 2024 has nearly replaced the financial impact of losing the federal ITC. Your NEB credits are worth 50% more than three years ago. Solar locks your rate at $0/kWh while neighbors pay $0.27+ (and climbing). Combined with Propel financing (Day 1 cost at ~70%), property tax exemption, and sales tax exemption, the incentive stack still delivers excellent returns.
The key is knowing about every available program, stacking them correctly, and choosing the right financing path. This guide ensures you do not leave money on the table.
Each layer stacks on top of the others. Claim all seven and a $27,500 solar system delivers $35,000+ in total value over 25 years.
Previously 30% of system cost (~$8,250 on a $27,500 system). Now $0 for cash/loan purchases. If you lease or PPA, the third-party owner can still claim Section 48/48E (30%+) on projects beginning construction before July 4, 2026 — and pass some savings to you as lower payments. Alternatively, Propel financing achieves a similar result through ownership.
The ITC is dead for cash and loan purchases. But Propel financing brings your Day 1 cost down to ~70% of system price — and you still own the system.
Propel is a Concert Loan + Prepaid ESA — NOT a PPA, NOT a lease
You own the system and keep all NEB credits
Propel Price = system cost x 0.70 (conservative 30% ITC captured through the financing structure)
A $27,500 system becomes ~$19,250 after the Propel reduction
Terms: 25 years / 8.99% APR / $0 dealer fee / 660 FICO minimum
Loan range: $10K-$135K
Requires FEOC-qualified panels — Silfab 440W is the standard choice
Why Propel matters for Maine: With no federal ITC and no state rebate, Propel is the only path that delivers a meaningful Day 1 cost reduction for homeowner-owned systems. It effectively replaces the 30% ITC by structuring the financing so the tax credit benefit flows through the Concert Loan mechanism.
Here is what the full incentive stack looks like for a typical Maine homeowner on CMP, purchasing a 9 kW system with cash.
| Item | Value |
|---|---|
| Solar System (9 kW at $3.05/W) | $27,450 |
| Federal ITC (25D) | $0 |
| Sales Tax Exemption (5.5%) | -$1,510 |
| Net Out-of-Pocket Cost (Cash) | ~$25,940 |
| Net Cost with Propel Financing | ~$19,215 |
| NEB Credits (25 years) $0.27/kWh x 10,800 kWh/yr, with 3% annual rate increase | ~$72,900 |
| Property Tax Savings (permanent) $381/yr at 1.39% rate, 25-year system life | ~$9,525 |
| Avoided Utility Bills (self-consumed) 35% self-consumed x $0.27/kWh rising 3%/yr | ~$39,300 |
| CMP Rate Arbitrage Bonus Extra value as CMP rates exceed $0.32/kWh projected by 2028 | ~$15,000+ |
| Total Lifetime Value (cash purchase) | $110,000+ |
CMP Territory Payback
~8.9 Years
Cash purchase, 9 kW, $0.27/kWh rate
Versant Territory Payback
~7.5 Years
Cash purchase, 9 kW, $0.32/kWh rate
Follow these steps in order. Each one builds on the previous. Skip none of them.
Request quotes from at least three NABCEP-certified solar installers, including NuWatt. Compare $/W pricing, panel tiers, and warranty terms. Ask each installer about NEB enrollment, Propel financing eligibility, and CMP interconnection timeline.
Confirm whether you are on CMP ($0.27/kWh) or Versant ($0.32/kWh). Both offer 1:1 retail NEB credits, but Versant customers have even faster payback due to higher rates. Understand the annual true-up process and monthly credit rollover.
Propel reduces your Day 1 cost to ~70% of system price (Concert Loan + Prepaid ESA). Compare this to cash purchase (best long-term ROI), standard solar loan (6-8% APR), and Efficiency Maine Loan ($7,500 at 5.99%). Propel requires FEOC-qualified Silfab 440W panels.
Select from entry-tier (Hyundai 440W, lowest cost), standard (Silfab 440W, FEOC-qualified, required for Propel), or premium (REC 460W, highest efficiency). Your choice affects $/W pricing but all tiers qualify for every Maine incentive.
Maine solar equipment is exempt from 5.5% sales tax, saving ~$1,500-$2,000 at purchase. Property tax exemption is statewide and permanent — solar adds home value but $0 to your property tax bill. Verify with your town assessor after installation.
Review the contract for total cost, warranty terms, NEB enrollment commitment, financing terms (if Propel), and payment schedule. If using Section 48E (lease/PPA), ensure construction begins before July 4, 2026. Typical ME installations are scheduled 4-6 weeks after signing.
A typical residential solar installation takes 1-2 days. Your installer mounts panels, runs wiring, installs the inverter, and connects to your electrical panel. CMP and Versant interconnection typically takes 2-4 weeks for Permission to Operate (PTO).
After PTO, track your monthly NEB credits on your CMP or Versant bill. Every time CMP raises rates, your solar credits become more valuable automatically. Set up monitoring to verify your system performs as designed.
Ready to start with Step 1?
Get Your Free Solar QuoteWe see these mistakes constantly. Each one can cost you $2,000-$10,000+ in lost value or wasted money.
Cost: Every month without solar = $200-$350+ to CMP at rates rising rapidly. CMP has raised rates 30%+ since 2024 alone. Waiting is the most expensive decision.
Fix: There is no pending legislation to reinstate 25D. Install now while CMP rates make NEB credits historically valuable.
Cost: You miss the fact that CMP rate increases have nearly replaced the ITC value. Payback is ~8.9 years today vs ~8.5 years in 2024 WITH the ITC. The gap is tiny and shrinking.
Fix: Run the actual numbers with current CMP rates ($0.27/kWh). The math works. See the side-by-side comparison above.
Cost: You pay full price when Propel could reduce your Day 1 cost to ~70%. On a $27,500 system, that is ~$8,250 saved immediately.
Fix: Ask your installer about Propel eligibility. Maine is one of only two Propel states (with Texas). FICO 660+, Silfab 440W panels required.
Cost: You think LD 1777 (2023) reduced your solar credits. It did NOT — LD 1777 only affected community solar projects. Rooftop NEB remains 1:1 retail rate.
Fix: Confirm with your installer: rooftop residential solar gets full 1:1 retail NEB credits. Period.
Cost: Maine property tax exemption is statewide and mandatory, but some assessors may not apply it automatically. Missing this costs $380+/year permanently.
Fix: Contact your town assessor within 60 days of installation. Bring your solar installation receipt. The exemption is mandated by state law (36 M.R.S. section 655).
We serve both states. Here is the honest comparison. MA has a stronger incentive stack, but Maine's CMP rate crisis is narrowing the gap fast.
| Incentive | Maine | Massachusetts |
|---|---|---|
| Federal ITC (25D) Expired in both states | $0 | $0 |
| State Tax Credit MA advantage | None | $1,000 |
| Production Incentive MA advantage: $6K-$8K value | None | SMART $0.03/kWh (20yr) |
| Net Metering Similar — MA slightly higher | 1:1 retail ($0.27/kWh CMP) | 1:1 ($0.28-$0.32/kWh) |
| Sales Tax Exempt Both exempt | 5.5% exempt | 6.25% exempt |
| Property Tax Exempt ME advantage: permanent + mandatory | Statewide permanent | 20 years |
| Battery Incentive MA advantage | None | ConnectedSolutions $225-$275/kW |
| State Loan ME advantage | Efficiency ME: $7,500 at 5.99% | None (ended 2020) |
| Propel Financing ME advantage: ~30% Day 1 reduction | Available (Propel state) | Not available |
| Avg Cost/W ME advantage: lower install costs | $3.05/W | $3.40/W |
| Cash Payback MA faster, but gap narrowing | ~8.9 years (CMP) | ~7.5 years |
Bottom line: Massachusetts has a stronger overall solar incentive stack thanks to SMART 3.0 and a $1,000 state tax credit. But Maine has two critical advantages: Propel financing (not available in MA) and lower installation costs ($3.05/W vs $3.40/W). Combined with CMP's aggressive rate increases, Maine payback periods are approaching MA levels despite having fewer state programs. For homeowners who qualify for Propel, Maine economics can actually beat Massachusetts.
The residential 25D credit is dead. But the commercial 48/48E credit lives on — and there are two ways for Maine homeowners to benefit.
Deadline: Section 48/48E is available for projects that begin construction before July 4, 2026. After that date, the lease/PPA backdoor closes. Propel financing availability beyond 2026 depends on program continuation. If you are considering either path, act before summer 2026.
No. The federal residential solar Investment Tax Credit (Section 25D) expired on December 31, 2025. Maine homeowners who buy solar with cash or a loan receive $0 from the federal government in 2026. Many solar company websites still advertise a 30% federal credit — this is false and misleading.
No. Maine does not offer a state-level solar rebate, tax credit, or production incentive like Massachusetts SMART. Efficiency Maine focuses its rebates on heat pumps, not solar. Maine homeowners rely on Net Energy Billing credits, property tax exemption, Efficiency Maine Loan, and Propel financing instead.
Maine homeowners can still access $20,000-$35,000+ in total incentive value over the system lifetime. This includes NEB credits ($2,000-$3,500/year for CMP customers, more for Versant), sales tax exemption (~$1,500-$2,000), permanent property tax exemption ($400-$600/year), Efficiency Maine Loan savings, and Propel financing that brings Day 1 cost to 70% of system price.
Net Energy Billing credits your electric bill at the full 1:1 retail rate for excess solar production sent to the grid. If CMP charges $0.27/kWh, you get credited $0.27/kWh for every kWh exported. Credits roll over monthly with annual true-up. Rooftop solar NEB was NOT affected by LD 1777 (2023), which only changed community solar compensation.
CMP rates increased over 30% between 2024 and 2026, from roughly $0.18/kWh to $0.27/kWh. Since NEB credits are at 1:1 retail rate, every CMP rate increase makes your solar credits MORE valuable. Solar locks your effective rate at $0/kWh — while neighbors keep paying more and more. CMP rates are projected to continue rising.
Propel is a Concert Loan + Prepaid ESA that reduces your Day 1 solar cost to approximately 70% of the system price. It is NOT a PPA or lease — you own the system. Terms: 25-year, 8.99% APR, $0 dealer fee, 660 FICO minimum, $10K-$135K range. Propel requires FEOC-qualified panels (Silfab 440W).
Yes, especially with CMP rates at $0.27/kWh and rising. A 9 kW system costing ~$27,500 generates ~$2,900/year in NEB credits plus $400/year in property tax savings. Payback is approximately 8-9 years on CMP. Every month you wait, CMP raises rates again — increasing both your electric bill and the cost of inaction.
No. There is no legislation pending to reinstate Section 25D. Waiting costs you money: every month without solar means paying $200-$350+ to CMP at rates increasing rapidly. CMP has raised rates 30%+ since 2024 alone. Delaying only increases your total cost of electricity while Maine incentives remain available.
Every active program in one place
Full guide to Maine net metering
Why CMP rates keep climbing
Honest math for 2026 ME solar
How Propel financing works in ME
Best financing path for 2026
Which utility territory is better?
Real pricing by city and utility
Sales + property tax exemptions
The federal credit is gone and Maine has no state rebate. But CMP rates are up 30%+, NEB credits have never been more valuable, and Propel financing cuts your Day 1 cost by ~30%. Every month you wait, CMP raises rates again.
Free, no-obligation quote. Includes Propel financing evaluation and CMP/Versant rate analysis.