A peak demand charge is a utility billing component that penalizes customers for their maximum power consumption during peak demand periods, typically occurring during high-use hours or seasons. These charges apply specifically to consumption during the utility’s defined peak window, often 2pm-8pm on weekdays, and can be substantially higher than standard demand charges. Peak demand charges encourage customers to reduce consumption precisely when grid stress is greatest.
Rate Structure and Pricing
Peak demand charges typically range from $10-$50 per kW per month and apply only to power drawn during designated peak hours, which vary by utility and season. A customer reaching 300 kW during peak periods pays charges of $3,000-$15,000 monthly, independent of off-peak consumption. Summer peak periods often carry charges 50-200% higher than winter periods.
Customer Response Strategies
Customers reduce peak demand charges through load shifting to off-peak hours, installation of battery storage systems discharged during peak periods, and participation in demand response programs that compensate for voluntary consumption reductions. Facilities using these strategies reduce peak charges by 20-50%.
Grid Stability Benefits
Peak demand charges support grid stability by reducing strain during the hours when generation capacity is most constrained. They encourage distributed generation and storage deployment, supporting renewable energy integration and reducing utility reliance on expensive peaking power plants.