We look at the last 12 months of your electricity use to determine the right number of solar panels for you. If your usage exceeds your share, you do not need to worry about running out of power, as it will still come from your utility. The credits you receive monthly represent actual electricity produced by panels reserved at a local solar farm. We aim to provide you with enough credits throughout the year to cover 90-110% of your electric costs. We consider all factors that influence the energy each panel can produce and allot, including seasonal variability [link to seasonality question]. If you do not have 12 months of electricity use, we will reserve your share using an estimate. If need be, you can adjust this down the line by contacting us at support@nexamp.com or 855-727-4636.