As your solar array generates power, one of two things will happen:
- The electricity will be consumed by your property via lights, appliances, etc.
- The unused electricity will flow back to your utility. What happens with this unused electricity depends on your utility's metering policy.
It is important to note that the utility will NOT measure the entirety of the solar production, it will only measure what is fed back to the grid. For information on net metering, see here.