Solar Savings Calculator
Going solar is a long-term investment. This calculator projects your cumulative savings over 25 years — accounting for rising electricity rates, the federal Investment Tax Credit (ITC), state incentives, and net metering credits — so you can see when the system pays for itself and what the total return looks like.
Estimate Your 25-Year Solar Savings
Projections assume consistent energy production, the stated annual rate increase, and standard panel degradation. Actual savings depend on weather variability, utility rate changes, net metering policy changes, and maintenance costs. The federal ITC requires sufficient tax liability to claim. Consult a tax professional for eligibility.
Understanding Solar Savings
How Solar Pays for Itself
Solar savings come from displacing electricity you would otherwise buy from the utility. Each kWh your panels produce is a kWh you do not pay for at the retail rate. Because utility rates increase over time — historically 2–4% per year nationally — the value of each kWh your panels produce also increases, accelerating savings in later years.
The Federal Investment Tax Credit (ITC)
The Inflation Reduction Act of 2022 extended the federal solar ITC at 30% through 2032. This is a dollar-for-dollar reduction of your federal income tax equal to 30% of the total installed system cost. The credit drops to 26% in 2033, 22% in 2034, and is scheduled to expire for residential systems after 2034 unless extended.
| Year Installed | ITC Rate | Credit on $22,000 System |
|---|---|---|
| 2024–2032 | 30% | $6,600 |
| 2033 | 26% | $5,720 |
| 2034 | 22% | $4,840 |
| 2035+ | 0% (unless extended) | $0 |
Net Metering
Net metering policies determine the value of excess solar energy sent back to the grid. Under full retail net metering (1:1), each kWh exported is credited at the same rate you pay to buy. Some states have moved to reduced rates or time-of-use structures. Check your state and utility policies — net metering rules significantly impact solar economics.
Panel Degradation
Solar panels slowly lose efficiency over time. Most manufacturers guarantee at least 80% of original output at year 25. Standard crystalline silicon panels degrade about 0.5% per year. This calculator accounts for this gradual decline in annual production estimates.
Frequently Asked Questions
What is a good payback period for solar?
Most residential solar systems pay back in 6–12 years, depending on electricity rates, incentives, and sun exposure. Systems in high-rate states like California, Massachusetts, and Connecticut often achieve payback in 5–7 years. In lower-rate states, payback may extend to 10–14 years, though the 25-year savings remain substantial.
Does solar increase home value?
Studies by the Lawrence Berkeley National Laboratory found that solar panels increase home sale prices by approximately $4 per watt of installed capacity — roughly $32,000 for an 8 kW system. This premium may vary by market and is generally higher in areas with high electricity rates.
What maintenance costs should I expect?
Solar systems have minimal maintenance costs. Inverter replacement ($1,000–$2,500) is typically needed once during the 25-year system life, usually around year 12–15. Panel cleaning may be needed in dusty climates. Annual maintenance budgets of $150–$300 are typical. Most installers offer monitoring and maintenance plans.