The utility company has an annual payout date for excess energy.  However, the energy is rolled over from one month to the next.  In the winter months your system will produce less energy because of daylight hours and less exposure to sunlight.  In the summer, extra energy will be stored for the winter months. When estimating the size system for your home, we look at the entire year’s energy use.  If your family needs are changing (Additional family member, electric car, etc) we could offer additional panels if your roof has the room.