Most commercial electricity cost-reduction efforts focus on the energy rate ($/kWh). But for many businesses, demand charges ($/kW) represent 30–40% of the total electric bill — and they respond to a completely different set of strategies.
Your utility measures your electricity draw in 15-minute intervals throughout each billing period. The highest 15-minute average demand reading — even if it occurred once and lasted only a quarter-hour — becomes your demand peak for the month.
That peak is multiplied by the utility's $/kW demand charge rate — often $8–$22/kW depending on your tariff and state — and applied to your entire bill. A single equipment startup event, a hot day running all HVAC units simultaneously, or a production surge can add hundreds or thousands of dollars to a monthly bill.
Demand management strategies target that peak. The goal: reduce the highest interval reading, which reduces the multiplier applied to every kW of your peak for the whole month.
Enroll in an ISO/RTO demand response program. When the grid calls an event (typically hot summer afternoons), you reduce load for 2–4 hours. In return, you receive capacity payments — $50,000–$500,000 annually for large commercial accounts in PJM.
On-site battery storage (BESS) or emergency generator is dispatched during high-demand periods to reduce grid draw and flatten the peak. Payback is driven by demand charge rate and frequency of peak events.
Move discretionary loads (manufacturing shifts, EV charging, HVAC pre-conditioning, refrigeration defrost cycles) to off-peak hours. No capital investment — often the fastest payback for facilities with operational flexibility.
Industrial motors, HVAC compressors, and lighting ballasts draw reactive power that appears on your bill as a power factor penalty or elevated apparent demand. Capacitor banks correct power factor and reduce billed demand.
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