Charlotte manufacturing client has Duke Energy AMI meter showing maximum 15-minute interval demand of 847 kW but monthly bill shows billing demand of 923 kW. Old mechanical demand meter matched the billed demand exactly. What could cause this discrepancy?
Duke Energy smart meter demand interval vs billing demand mismatch
Idaho Power had similar issue. Smart meter records true 15-minute intervals but billing system was using 30-minute rolling average for demand calculation. Check Duke's tariff for demand calculation method.
Alabama Power uses thermal demand calculation that can exceed instantaneous readings. Smart meters measure true power but thermal demand simulates old mechanical meter behavior for rate consistency.
Evergy in Kansas uses similar thermal demand calculation. It's designed to match what old Westinghouse demand meters would have recorded. Creates billing consistency during meter transition period.
Southern California Edison switched to true 15-minute demand billing when they completed smart meter rollout. Old thermal calculation was phased out over 3 years. Check if Duke has similar phase-out plan.
Demand calculation differences between smart meters and legacy billing systems are common during transition periods. Always verify the tariff specifies which method applies for billing purposes.