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Solar Savings Calculator

How much could solar cut your electricity spending? Enter your state and bill for an estimate of monthly, annual and 25-year savings, plus payback.

Savings assume a system sized to your chosen offset, average local sun and electricity rates, 0.5%/yr panel degradation and a 3%/yr utility rate increase. This is a planning estimate, not a quote.

Estimated 25-year savings
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  • Estimated monthly savings (year 1)—
  • Estimated annual savings (year 1)—
  • Estimated lifetime (25-yr) savings—
  • Estimated net system cost—
  • Estimated payback period—

Adjust the form to see your estimate.

Get quotes to confirm your savings See the full cost breakdown

How solar savings are calculated

Your year-one savings are the electricity your system is expected to produce multiplied by your utility rate. Over 25 years, savings grow because utility rates historically rise (we assume 3%/yr) even as panel output slowly declines (0.5%/yr). Payback is the point where cumulative savings equal what you paid after incentives.

The biggest levers are your electricity rate, your sun resource and the price you're quoted per watt. Full methodology →