Quick answer
The practical explanation
Yes. Solar modules normally produce slightly less electricity as they age. NREL describes typical degradation in the range of roughly 0.5% to 1% per year, though actual performance depends on product quality, climate, installation, and system condition.
What to know
Three points to keep in mind
- Gradual degradation is normal and should be reflected in long-term estimates.
- A sudden production drop is different and deserves troubleshooting.
- Monitoring helps separate normal aging from shading, dirt, wiring, or equipment problems.
For your home
A site-specific answer still matters
Solar results and service needs depend on the roof, equipment, shade, household electricity use, utility requirements, and the condition of the existing system. Use this guide as a starting point, then have the property and equipment evaluated before making a major decision.
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Authoritative references
This article summarizes general consumer information and is not tax, legal, insurance, engineering, or utility-rate advice.