Energy & Sustainability calculator

Utility Demand Charge Calculator

Demand charges are driven by the highest billed kW during the utility interval, not total kWh. This calculator helps facilities and finance teams estimate monthly demand-cost exposure from peak demand or proposed load additions.

What this calculator does

  • Estimate monthly utility demand charge from billing peak kW, demand rate, billing applicability, and fixed utility fees.
  • a facility or utility manager needs to estimate demand charges from monthly peak kW
  • Returns the utility demand charge for the selected facility, line, product, project, or reporting boundary.

Formula used

  • Variable demand charge = billing peak demand × demand charge rate × billing applicability
  • Total utility demand charge = variable demand charge + fixed demand-related fees

Inputs explained

  • Billing peak demand: Use the ratcheted, measured, or forecast billing peak demand from the utility interval.
  • Demand charge rate: Use the tariff demand rate for the account, season, or service class.
  • Billing applicability: Use 100% for full applicability or adjust for ratchet, allocation, curtailment, or shared-meter assumptions.
  • Fixed demand-related fees: Include meter, rider, standby, or minimum-demand charges tied to the same bill period.

How to use the result

  • Use it for energy management, sustainability reporting, utility-cost review, project screening, compliance planning, or operational performance tracking.
  • It does not replace certified emissions inventories, utility tariff analysis, engineering M&V studies, or regulatory reporting review.

Common questions

  • What does the utility demand charge calculator tell me? It converts the stated energy, carbon, utility, water, waste, or project assumptions into the utility demand charge result shown on the page.
  • Which data should I enter? Use values from utility bills, submeters, emissions-factor tables, production records, supplier data, project estimates, or approved reporting workbooks for the same boundary and period.
  • How should I use the result? Use it to compare projects, support reporting, prioritize audits, update product costing, estimate savings, or prepare a business case before committing resources.
  • When is this only an estimate? Treat it as an estimate until final tariffs, emissions factors, production allocation, metering accuracy, weather or production normalization, and project performance are confirmed.

Last reviewed 2026-05-12.