First identify which cost changes: plate freezing, cold-store operation, and vehicle fuel have separate meters and boundaries. Do not count a passive container itself as an energy-consuming device.
Invoice inputs
| Electricity | Metering period, kWh, tariff band, and unit charge |
|---|---|
| Fuel | Invoiced quantity and unit price |
| Other items | Fixed charge, tax, and other billed amounts |
Choose a base period and currency. Keep quantity, unit price, and fixed charges in separate columns.
For a scenario, hold actual consumption constant and change only the unit-price assumption. Recalculate the energy row from quantity, tariff, and invoice add-ons.
Time-of-use tariffs
Align meter records with billing hours. Do not assume plate freezing can move to a cheaper hour or save money without operational confirmation.
Separate consumption boundaries
Measure active vehicle, depot, and plate-freezing use separately. Passive carriage may use no energy; include freezing and support-process consumption.
Scenario sensitivity. Show current tariff beside alternative prices. Separate price effects from consumption changes by using distinct low and high use inputs.
Keep invoice version, meter ID, period, and missing-data assumptions. In a new period, update quantity and price separately.
