Free commercial utility-bill economics tool
Commercial Electricity Demand Charge Calculator
See how much of your utility bill comes from the highest kW interval instead of energy consumption — then price the value of shaving peak demand with controls, scheduling, batteries or operational changes.
Simple monthly demand model
Peak-Shaving GateSeparate energy usage from peak-demand cost
Monthly utility load
Utility tariff
Peak-shaving economics
Demand-charge logicBilled demand is the larger of measured peak kW and the entered minimum billed demand. Peak shaving changes demand charges only when the resulting billed kW actually falls. Energy kWh is held constant unless you change it.
Bill Stack
Where the monthly utility bill comes from
Peak-Shaving Ladder
Demand-charge savings at different peak reductions
| Peak reduction | New measured peak | New billed demand | Demand charge | Monthly savings | Annual savings | Bill reduction |
|---|
Peak kW × Demand Tariff
Monthly demand-charge sensitivity
Advanced 12-month demand audit
Demand Exposure QueueFind the months driving annual demand exposure
Shared tariff & peak-shaving assumptions
Peak-management project economics
12 monthly utility periods
Ratchet treatmentThis advanced model uses a simplified annual benchmark: billed demand is the maximum of measured peak, minimum demand and ratchet % × the entered prior-demand benchmark. Real utilities may use different lookback periods, seasonal ratchets, coincident peaks or contract demand. Enter your tariff-specific values when available.
Demand Exposure Queue
Rank months by demand-charge and peak-shaving value
| Rank | Month | kWh | Measured peak | Billed demand | Demand tariff | Demand charge | Ratchet/floor drag | Load factor | Target shave savings | Signal |
|---|
Annual Bill Bridge
Energy, demand and ratchet exposure
Peak-Shaving Stress Test
Annual savings at different reduction levels
| Peak reduction | Annual demand charges | Gross annual savings | Net annual savings after OPEX | Simple payback | Project NPV | Months still ratcheted/floored |
|---|
Demand Tariff × Peak Reduction
Annual demand savings sensitivity
Scope
Demand tariffs are utility-specific
This calculator is a financial planning model, not a utility tariff engine. Demand billing may be based on 15-minute, 30-minute or other intervals and can include contract demand, ratchets, seasonal rates, coincident-peak charges, power-factor adjustments and other tariff rules. Enter values from your actual utility tariff or bill before using the result for an investment decision.