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Maine solar delivers 14-18% tax-free annual returns — outperforming the stock market's historical ~10% (pre-tax). Here is the real math for 2026.
An 8 kW solar system in Maine costs ~$24,600 cash and generates $2,890-$3,418/year in tax-free electricity savings (depending on CMP vs Versant rates). That is a 14-18% annual return — compared to the S&P 500's historical 10% pre-tax (~7-8% after capital gains tax). Solar is also immune to market crashes, inflation-protected, and property-tax-exempt in Maine. The trade-off? Your investment is tied to your home.
Most people evaluate solar as a “home improvement” — like a new roof or kitchen remodel. That is the wrong frame. Solar panels produce measurable, predictable cash flows for 25+ years. That makes them an investment, and they should be compared to other investments on the same terms: return, risk, tax treatment, and time horizon.
This comparison is especially relevant in Maine for three reasons:
How $24,600 invested today performs across different vehicles
| Investment | Annual Return | Tax Treatment | Risk | Liquidity |
|---|---|---|---|---|
| Maine Solar (CMP territory) | 14–16% | Tax-free savings | Very Low | Illiquid (tied to home) |
| Maine Solar (Versant territory) | 16–18% | Tax-free savings | Very Low | Illiquid (tied to home) |
| S&P 500 Index Fund | ~10% historical | Taxable (capital gains + dividends) | Moderate–High | Highly liquid |
| US Treasury Bonds (10-year) | ~4.3% | Taxable (federal) | Very Low | Moderate |
| High-Yield Savings / CDs | 4.5–5.0% | Fully taxable (ordinary income) | None (FDIC insured) | High |
S&P 500 returns based on 30-year average (1994-2024). Treasury rates as of Q1 2026. Solar returns assume cash purchase, 1:1 NEB, 3% annual rate escalation.
Solar returns depend on specific, measurable factors — not speculation or sentiment. Here is what makes Maine solar a strong investment:
Maine guarantees 1:1 retail-rate bill credits for rooftop solar exports. Every kWh you send to the grid offsets a kWh you would have bought at $0.27-$0.32/kWh. This is the single biggest ROI driver.
CMP charges ~$0.27/kWh, Versant ~$0.32/kWh. The higher the rate you offset, the higher the implicit return. Maine rates have risen 35%+ since 2020.
Solar panels are 100% exempt from property tax statewide (36 M.R.S. §655). A $25K system adds $0 to your tax bill — unlike a kitchen remodel or pool.
Maine electricity rates have increased 4-6% annually over the past decade. Every rate increase boosts the value of solar savings — your panels produce the same kWh but each kWh is worth more.
Solar electricity savings are not taxable income. A $2,500/year electricity savings is equivalent to earning ~$3,200 pre-tax (at a 22% marginal rate).
Studies show solar adds ~3-4% to home value. On a $350K Maine home, that is $10,500-$14,000 in equity — and it is property-tax-exempt.
25-year projections based on actual Maine utility rates and system costs
Based on $3.08/W average, 1,160 kWh/kW, $0.27/kWh, 3% annual rate escalation
Same system, $0.32/kWh Versant rate drives faster payback
Propel Concert Loan + Prepaid ESA. Third-party claims Section 48 ITC. $0 down, day-1 savings.
This is the part most comparisons miss. Solar savings are not taxable income. Stock market returns are. Here is how that changes the math:
Pre-tax equivalent: ~$3,730/yr at 22% federal bracket
Effective after-tax return: ~7.8%
Note on the 25D ITC: The federal residential solar tax credit expired December 31, 2025. All ROI calculations on this page reflect the current reality — no federal credit. The strong returns shown here are driven entirely by Maine's high rates, 1:1 NEB, and property tax exemption.
Returns matter, but so does risk. Here is how the two compare:
None — panels produce regardless of market conditions
S&P 500 has declined 20%+ in 5 of last 25 years
Built-in — as electricity rates rise, savings increase
Partial — companies pass costs through, but lag
Minimal — panels degrade ~0.4%/year. 25-year warranties standard
Significant — individual companies can become obsolete
High — tied to your property until you sell the home
None — sell any day the market is open
None — steady annual savings regardless of market timing
Significant — bad early returns can devastate portfolio value
Low — Maine NEB is protected by law. Rates set by PUC.
Low–Moderate — tax law changes can affect after-tax returns
Here is something stock analysts do not factor into solar ROI calculations: electricity rate escalation. Maine rates have risen dramatically:
2020
$0.18
CMP
$0.22
Versant
2023
$0.23
CMP
$0.28
Versant
2026
$0.27
CMP
$0.32
Versant
That is a 50% increase for CMP and a 45% increase for Versant in just six years. If this trend continues at even 3-4% per year, your solar savings grow automatically — your panels produce the same kWh, but each kWh is worth more.
After 25 years with 3% annual escalation, a CMP customer's effective rate would be ~$0.57/kWh. Your solar panels would be saving you $0.57 per kWh produced in year 25 — more than double today's savings rate.
Solar is not always the answer. Here are situations where traditional investments make more sense:
You plan to move within 2-3 years
Solar needs 7-9 years to pay back in Maine. If you sell before payback, you may recoup some via home value premium, but the returns are unpredictable.
You need the money accessible
Solar is an illiquid investment. If you might need the $24K for emergencies, medical expenses, or other investments, keep it liquid.
Your electric bill is under $75/month
Low electricity use means low savings. A $75/month bill only supports a 3-4 kW system with minimal ROI improvement over a CD.
Your roof has heavy shade or faces north
Maine is 89% forested. If your roof is heavily shaded, solar production drops and ROI falls below competitive alternatives.
You are already maxing retirement accounts
If you have not maxed your 401(k) match, do that first. Employer matching is a guaranteed 100% return.
The best approach for most Maine homeowners is not solar or stocks — it is solar then stocks. Here is the optimal sequence:
Guaranteed 50-100% return. Always do this first.
14-18% tax-free returns, inflation-protected, risk-free energy production.
Your $240-$285/month savings goes straight into a brokerage account. Compound on compound.
When rates spike 10-15% (as CMP did in 2022), your budget does not flinch.
Install 8 kW solar ($24,600 cash) + invest $240/month savings into S&P 500 index fund. After 25 years:
$72,250
Solar electricity savings (CMP)
$195,000+
Reinvested savings growth (10% avg)
$267,250+
Total wealth from $24,600 investment
What if you could get solar returns with zero capital outlay? Propel financing makes this possible in Maine:
$0
Upfront Cost
Concert Loan + Prepaid ESA
Yes
Day-1 Savings
Monthly payment < prior electric bill
None
Capital Required
Keep your $24K invested elsewhere
$22,500-$30,000
25-Year Net Benefit
Net savings after all payments
With Propel, you can have both: solar on your roof generating savings AND your $24,600 invested in the stock market. The combined return potential exceeds either strategy alone.
See exactly how much your home can produce — and what your real ROI looks like based on your specific roof, utility, and usage.