Quick answer
The practical explanation
Savings depend on current electricity use, system production, utility rates, fixed charges, financing, ownership structure, and how exported energy is credited. Future utility rates cannot be known with certainty, so projections should show their assumptions.
What to know
Three points to keep in mind
- Use actual utility bills and annual kWh consumption.
- Separate fixed utility charges from energy charges.
- Treat aggressive future rate increases as assumptions, not guarantees.
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.