Your meter measures the flow of electricity to your business in 15-minute intervals. Your period of highest demand, or peak demand, is recorded and shown on your bill. Once your peak demand is established, it remains the same for 12 months unless you reach a new peak. That’s why your bill will show both your actual kW demand peak for the month and your billed kW demand. To determine your billed kW demand, your TDU uses the higher of 80% of the annual peak or the current month's peak demand.