If you’re on a demand charge electric rate, your electric bill will be based on the maximum amount of power you use over a single time period (like an hour or fifteen minute period) in a given month. You’ll still be billed for your monthly consumption, but the rate you owe for consumption will be low compared to a typical electric bill; thus, the best way to reduce the amount you owe each month is to decrease the amount of electricity you use all at once – like by installing a solar or solar-plus-storage system.