Can you sell solar electricity to the power company?

Yes

Yes, in many places if you install solar panels on your home you can sell any excess electricity that you don't use back to the power company (if you are still hooked up to the electricity grid). This often done by people who supplement their electricity needs with solar panels. During the day, they make more electricity than they need, and they sell it back to the power company. At night, when their solar panels are not supplying any energy, they used power from the power company. This solves the problem of having to store the electricity yourself (since every night the sun goes down!). If you do want to sell energy back to the power company you need to install a "net meter" if your power company offers one. It's the net meter that is able to spin backwards to track how much energy is pumped back into the grid. You can read more on the technology involved in residential solar energy on this site: http://residentialsolar101.org/.