Work out time of use tariff savings instantly with clear inputs, formula shown and shareable results.
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.
Time-of-use saving
Saving = shiftable energy x (peak rate - off-peak rate)
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.
Sometimes slightly — thermal storage loses heat and batteries lose energy round-trip. Net saving must be checked against the extra kilowatt-hours consumed.