Demand charge ratchet calculator

Billed demand = the larger of the month's peak, ratchet % of the highest peak in the previous N months, and the minimum. Steady state: earlier years repeat these 12 peaks. Defaults are invented example values, not a real tariff.

Monthly peak demand (kW, one reading per month)

Tariff (invented defaults)

Demand rate (USD per kW per month)

Ratchet (% of highest earlier peak)

Look-back (months, 0 to 11)

Minimum billing demand (kW)

One-off spike

Month of spike

Extra kW in that month

Annual charge with ratchet-

Annual charge, no ratchet-

Cost of the ratchet-

Months set by the ratchet-

Spike cost, with ratchet-

Spike cost, no ratchet-

Month	Peak kW	Billed kW	Charge USD