Solar is the best financial investment most homeowners can make in high-electricity-rate states — and a questionable one in low-rate states. We run the real numbers by state so you know exactly where you stand before you spend a dollar.
Before diving into state-by-state analysis, here's the national average scenario using 2026 data from NREL, EnergySage, and Wood Mackenzie:
The national average case shows a compelling ROI — you spend $15,960 net and receive $44,375 in electricity savings over 25 years (accounting for 0.5% annual panel degradation and 3% annual electricity rate escalation), for a net profit of $28,415. That's a return of approximately 178% on investment, or roughly 9% annualized.
The states with the best solar ROI combine high electricity rates, good sun exposure, strong net metering, and state-level incentives. Here are the top performers:
Avg electricity rate: 42¢/kWh (highest in US)
Average sun hours: 5.5–6.5/day
Key factor: Despite no export credits for new solar (own-use only), the sheer cost of grid electricity makes solar economics exceptional. An 8kW system saves $3,800+/yr. Battery storage essentially mandatory.
25-yr net profit estimate: ~$65,000
Avg electricity rate: 31.5¢/kWh
Average sun hours: 4.0–4.5/day
Key factors: Full retail net metering, SMART incentive program adds $0.03–0.08/kWh depending on capacity size, strong installer competition in greater Boston area.
25-yr net profit estimate: ~$52,000
Avg electricity rate: 28¢/kWh
Average sun hours: 5.0–7.0/day
Key factor: NEM 3.0 hurt new solar economics significantly. The 9.2-year payback assumes a battery is paired with solar (required for good CA economics post-NEM 3.0). Pre-NEM 3.0 customers still see ~7-year payback.
25-yr net profit estimate: ~$42,000 (with battery)
Avg electricity rate: 22¢/kWh
Average sun hours: 3.8–4.5/day
Key factors: NY-Sun incentive ($0.20–0.40/W cash rebate), full retail net metering, tax exemptions on system value. NYC electricity rates can reach 30¢/kWh, improving NYC area payback to ~8 years.
25-yr net profit estimate: ~$37,000
Avg electricity rate: 20¢/kWh
Average sun hours: 4.2/day
Key factors: New Jersey's SREC (Solar Renewable Energy Certificate) program currently pays $180–220/SREC, with an average home generating 8–10 SRECs/year — adding $1,440–2,200/yr in income on top of electricity savings. Exceptional policy support.
25-yr net profit estimate: ~$48,000 (including SREC income)
Avg electricity rate: 28¢/kWh (2nd highest in continental US)
Average sun hours: 4.0/day
Key factors: High electricity rates drive strong savings. Eversource and United Illuminating territory net metering is solid. Limited state rebates but strong economics from pure rate savings.
25-yr net profit estimate: ~$45,000
Understanding the five key variables lets you calculate your personal ROI rather than relying on state averages:
Every 1¢/kWh increase in your electricity rate adds approximately $100–120/yr to a typical 8kW system's savings. Going from 12¢/kWh (Louisiana) to 32¢/kWh (Massachusetts) more than triples your annual savings and cuts payback by 10+ years.
Phoenix (6.5 peak sun hours) generates ~40% more electricity per kW of panels than Seattle (3.7 peak sun hours). But because Seattle electricity costs more, the ROI difference is smaller than you'd expect.
Full retail credit (NJ, MA, NY) vs. avoided cost (CA NEM 3.0, TN) can swing your annual savings by $400–800 for a typical system. This is increasingly the variable that differentiates states.
Cash purchase: best ROI, full incentives. Solar loan at 7%: reduces net profit by $4,000–8,000 over 25 years but requires no upfront capital. Lease: no incentives, worst long-term ROI but lowest monthly cost.
Solar's ROI improves with time. If you stay 25 years, you capture full savings. If you sell in 5 years, the home value premium (4.1% avg) must cover the unrecovered installation cost — which it often does in markets with strong solar demand.
NJ's SREC program, MA's SMART program, NY-Sun rebates, and similar state incentives can add $1,000–5,000 upfront or $200–2,000/yr in additional income. Always check your state's DSIRE database for current programs.
The Lawrence Berkeley National Laboratory analyzed 23,000+ home sales across eight states and found that solar panels add an average of 4.1% to sale price. This is not speculative — it's documented in actual transactions.
This is remarkable: in the average case, solar adds more to your home's value than the system costs after the tax credit. Every year of electricity savings after that is pure profit. This is why solar is often described as one of the highest-ROI home improvements available.
Important caveat: The value premium is lower in states with poor net metering (TN, LA, AL) and lower electricity rates. In those states, buyers assign less value to solar savings because the savings are smaller.
Use this formula to run your own numbers:
Step 1: System cost × 0.70 = Net cost after 30% federal ITC
Step 2: Your annual kWh usage × your electricity rate = Annual electricity spend
Step 3: Annual electricity spend × solar offset % (typically 80–100%) = Annual savings
Step 4: Net cost ÷ Annual savings = Simple payback in years
Example: $22,800 × 0.70 = $15,960 net. 10,500 kWh × $0.22/kWh = $2,310 spend. $2,310 × 90% offset = $2,079 savings. $15,960 ÷ $2,079 = 7.7-year payback.