When you put solar on your home, you will be locking in a lower cost of electricity for the next 25 years. For instance, if a solar system that provides all of your electricity costs $15,000, that is all you will pay for your electricity for the next 25 years. In addition, solar panels often create more electricity than you consume; you might be able to sell that electricity back to the utility company through a program called "net metering" (depending on your location).