Solar ROI vs the Stock Market: Which Is the Better Investment?

The IRR comparison

In high-rate or strong-incentive states, a cash-purchased solar system delivers a 25-year IRR of roughly 8–12% (including rate escalation) — comparable to the S&P 500's long-run ~10%. In cheap-power states, solar IRR drops to 3–5%.

Why solar is different from stocks

Solar is a bond-like, inflation-hedged asset: your "dividend" is a locked-in electricity price for 25+ years as utility rates rise. It is illiquid (hard to sell part of a system) and location-specific, but it is also low-correlation with markets and tax-efficient in states with credits.

When solar beats the market

If you are in a 7–9 year payback state, plan to stay 15+ years, and would otherwise hold cash — solar beats the market on a risk-adjusted basis. If you are in a 15-year payback state or plan to move, stocks win. Run the ROI calculator for your exact IRR.

Is solar a better investment than the stock market?

In good states, solar IRR (8–12%) rivals the S&P 500's long-run average — with lower correlation and inflation hedging. In weak states, stocks win.

What is the typical IRR of a solar system?

8–12% in high-rate/strong-incentive states; 3–5% in cheap-power states (cash purchase, 25-year horizon).

Is solar a good investment in 2026?

Yes in ~7–9 year payback states (HI, MA, NY, NJ, MD), especially if you plan to stay 15+ years. Check your state's payback before deciding.