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NuWatt designs, installs, and manages solar, battery, heat pump, and EV charger systems across 9 states. One company, one warranty, one point of contact.
Get a Free QuoteConnecticut has some of the highest electric rates in America ($0.27-$0.28/kWh). That makes solar panels one of the best investments available to CT homeowners — delivering 18-22% annual returns, tax-free, guaranteed, and inflation-protected. Here is how it compares to putting the same money in the stock market.
18-22%
CT Solar Effective ROI
~10%
S&P 500 Historical
$0
Solar Tax on Returns
$80-$111K
25-Year Net Profit
A typical 11 kW Connecticut solar system costs $28,600-$34,100 and saves approximately $3,500-$4,200/year in electricity costs at current rates. That is an immediate 10-14% cash-on-cash return in year one alone. As CT electric rates rise 3-5% annually, your savings grow — pushing the effective annual return to 18-22% by year 10.
The same $31,000 invested in an S&P 500 index fund at a historical 10% nominal return grows to ~$80,000 after 10 years (pre-tax). But after 22% combined capital gains tax (CT), your net gain is ~$38,000. Solar’s net gain after 10 years: ~$40,600 tax-free. Solar wins — and the gap widens every year as rates increase.
CT Solar
18-22% effective
S&P 500
~10% historical (S&P 500)
Solar returns include eliminated bills + rate increase protection. Stock returns are pre-tax nominal average since 1928.
CT Solar
Tax-free (cost avoidance)
S&P 500
15-20% federal + 6.99% CT capital gains
Solar savings are not taxable income. Stock profits face combined 22-27% tax rate for CT residents.
CT Solar
Near-zero (electricity will be needed)
S&P 500
Moderate-high (market volatility)
You will always use electricity. The sun will always shine. Stock markets crash periodically (2000, 2008, 2020, 2022).
CT Solar
Built-in (savings grow as rates rise)
S&P 500
Partial (companies can raise prices)
CT electric rates have risen 3-5% annually. Each rate increase makes your solar savings larger. Solar is a natural inflation hedge.
CT Solar
Yes — panels warranted 25-30 years
S&P 500
No — past performance does not guarantee future
Panel manufacturers warrant 87-92% production at year 25. Your savings are as guaranteed as your electric bill.
CT Solar
Low — tied to your home
S&P 500
High — sell anytime in seconds
You cannot sell solar panels without selling your house. Stocks can be converted to cash within 1-2 business days.
CT Solar
Single asset — one house, one location
S&P 500
S&P 500 = 500 companies across sectors
Solar is concentrated risk (your roof, your state). Index funds spread risk across hundreds of companies and sectors.
CT Solar
Savings + ConnectedSolutions revenue
S&P 500
Dividends (~1.5% yield on S&P 500)
Solar eliminates your electric bill monthly + battery owners earn $700-$1,400/yr from ConnectedSolutions demand response.
CT Solar
Eliminates 4-6 tons CO2/year
S&P 500
Varies widely by fund
A CT solar system offsets 100-150 tons of CO2 over its lifetime. ESG stock funds have limited real-world environmental impact.
Solar wins on returns, tax treatment, risk, inflation protection, guaranteed returns, passive income, and environmental impact. Stocks win on liquidity and diversification. For CT homeowners with suitable roofs and stable home plans, solar is the superior investment.
Starting investment: $31,000 (average 11 kW CT solar system). Solar assumes $0.275/kWh starting rate, 4% annual rate increase, 0.5% annual panel degradation. S&P 500 assumes 10% nominal return, 22% combined tax on gains at withdrawal.
| Year | Solar Cumulative Value | S&P 500 After-Tax Value | Difference |
|---|---|---|---|
| Year 0 | $31,000 | $31,000 | Solar +$0 |
| Year 5 | $14,500 | $12,700 | Stocks +$1,800 |
| Year 8 | +$0 | $3,500 | Solar +$3,500 |
| Year 10 | +$9,600 | +$3,400 | Solar +$6,200 |
| Year 15 | +$38,000 | +$27,800 | Solar +$10,200 |
| Year 20 | +$72,000 | +$59,200 | Solar +$12,800 |
| Year 25 | +$112,000 | +$99,500 | Solar +$12,500 |
*Solar cumulative value = total electricity savings minus system cost. S&P 500 after-tax value = portfolio value minus initial investment minus 22% capital gains tax on gains. Does not include ConnectedSolutions battery revenue or home value increase from solar. Both investments assume no additional contributions.
$0.27-$0.28/kWh
CT rates of $0.27-$0.28/kWh are the 4th highest in America. Every kWh your solar produces is worth 2-3x more than in states like Texas ($0.11) or Florida ($0.13). This directly boosts ROI.
Retail Rate Credits
CT's RRES program credits excess solar at retail electricity rates. Your summer surplus rolls forward to offset winter bills. This means every kWh produced has maximum value — not a discounted wholesale rate.
$15K-$20K Tax-Free
Connecticut permanently exempts solar panel value from property tax assessment. Your system adds $15,000-$20,000 to home value, but your property taxes do not increase. Pure equity gain.
6.35% Saved
CT exempts solar equipment from the 6.35% sales tax (Form CERT-140). On a $31,000 system, that is $1,969 in immediate savings. This effectively lowers your cost basis and improves ROI.
3-5%/yr Increases
CT electric rates have increased 35-45% over the past decade, driven by transmission upgrades, capacity costs, and clean energy mandates. Each rate increase automatically increases your solar savings.
+$700-$1,400/yr
Adding a battery unlocks ConnectedSolutions demand response revenue ($700-$1,400/yr) plus the ESS incentive ($250-$600/kWh (legacy pre-April 2026 tiers)). Battery owners stack savings on top of solar returns.
On the same $100,000 in gains, a CT homeowner keeps $25,790 more from solar savings than from stock market profits. This is because solar savings are not taxable income — you are simply avoiding a cost (electricity), not earning income. The stock market investor faces up to 25.79% in combined federal and CT taxes on capital gains. This tax advantage alone makes solar’s lower-looking nominal returns actually higher in real, after-tax terms.
You plan to move within 5 years
Solar payback in CT is 8-11 years without the ITC. If you sell before payback, you may not recoup the full investment (though solar does increase home sale price).
Your roof needs replacement within 5 years
Solar panels last 25+ years. If your roof needs replacement in 5 years, you will need to remove and reinstall panels ($2,000-$5,000 cost). Factor this into your timeline.
Your roof has heavy shading
If tall trees shade your roof for more than 3-4 hours daily, solar production drops significantly, reducing ROI below stock market returns.
You need liquidity
Solar cannot be sold independently of your home. If you might need emergency access to your $31,000, stocks provide instant liquidity that solar cannot.
You are in a tax-advantaged retirement account
If your $31,000 is in a Roth IRA, stock gains are also tax-free. This eliminates solar's tax advantage and makes the comparison closer.
At $0.27-0.28/kWh for 11 kW system
4% annual rate increase on $3,500-$4,200 base
6.35% on $31,000 system
On $15K-$20K added home value at ~2% CT mill rate
Studies show 3.5-4% home value increase
Eversource/UI demand response
Enter your electric bill and home details to see your specific payback period, 25-year savings projection, and comparison to alternative investments.
Connecticut solar panels deliver an effective annual ROI of 18-22% when you factor in eliminated electricity bills ($0.27-$0.28/kWh), RRES netting tariff credits, sales tax exemption (6.35%), property tax exemption, and the 3-5% annual rate of CT electricity price increases. This return is tax-free, unlike stock market gains which are subject to capital gains taxes.
The S&P 500 has historically returned approximately 10% annually (7% after inflation). CT solar delivers 18-22% effective annual returns — and those returns are tax-free, guaranteed (your electric bill savings are predictable), and inflation-hedged (as rates rise, your savings increase). However, solar is illiquid (you cannot sell it like stocks), and returns are capped (excess production has diminishing marginal value).
Yes. Even without the 25D federal ITC (which expired December 31, 2025), Connecticut solar remains a strong investment due to the state's high electricity rates ($0.27-$0.28/kWh), RRES program benefits, sales tax exemption, property tax exemption, and the ESS battery incentive. Payback period has increased from 6-7 years (with ITC) to 8-11 years (without), but lifetime ROI remains excellent.
A typical 11 kW CT solar system costing $28,600-$34,100 saves approximately $115,000-$145,000 over 25 years in avoided electricity costs, assuming 3-5% annual rate increases from the current $0.27-$0.28/kWh baseline. After subtracting the system cost, net profit is $80,000-$111,000 — a 3-4x return on your initial investment.
Yes. Solar electricity savings are not taxable income — you are simply avoiding a cost (your electric bill), not earning income. This is a significant advantage over stock market returns, which are subject to capital gains tax (15-20% federal + 6.99% CT state). A 10% stock market return after 22% combined taxes is effectively 7.8%. Solar's 18-22% return stays at 18-22%.
Yes. Studies show solar panels increase CT home value by approximately $15,000-$20,000 for a standard residential system. Connecticut exempts this added value from property tax assessment, so you get the value without the tax burden. The Appraisal Institute recognizes solar as a value-adding home improvement.
Without the federal 25D ITC (expired December 31, 2025), the payback period for CT solar is 8-11 years depending on system size, electricity usage, utility territory, and financing. This means your system pays for itself in under half its 25-year warranted lifespan, then generates free electricity for 14-17 more years.