Time Of Use Tariff Savings Calculator

Work out time of use tariff savings instantly with clear inputs, formula shown and shareable results.

About Time Of Use Tariff Savings Calculator

Time-of-use savings come from moving load, not from using less: the saving is the energy shifted times the difference between peak and off-peak rates. Only genuinely deferrable load counts — thermal storage, battery charging, pumping, milling and non-critical batch processes.

Formula

Time-of-use saving

Saving = shiftable energy x (peak rate - off-peak rate)

Worked example

With the default values below, Time Of Use Tariff Savings Calculator returns Monthly Saving of $45,000.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Peak Period Consumptionminimum 0 kWh/month: 40,000 kWh/month
Shiftable Share Of Peak Loadaccepts 0–100 %: 25 %
Peak Rateminimum 0 per kWh: 9 per kWh
Off-Peak Rateminimum 0 per kWh: 4.5 per kWh

Results

Monthly Saving: $45,000.00
Annual Saving: $540,000.00
Energy Shifted Off Peak: 10,000.0
Reduction In Peak Period Cost: 12.500%

Step by step

1Values used
2Time-of-use saving
3Monthly Saving= 45,000.00
4Annual Saving= 540,000.00
5Energy Shifted Off Peak= 10,000.0
6Reduction In Peak Period Cost= 12.500

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation or tax into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

What load is genuinely shiftable?

Anything with inherent storage: water pumping into a tank, chilling into a cold store, battery charging, air compressor duty with receiver capacity, and batch processes with slack in the schedule.

Does shifting load raise total consumption?

Sometimes slightly — thermal storage loses heat and batteries lose energy round-trip. Net saving must be checked against the extra kilowatt-hours consumed.