Build a common baseline
Choose the country, currency, billing days, billing months and kWh. Use a recent representative period, then test a lower- and higher-usage case. For a time-varying plan, use consumption in each applicable period. Equal total kWh does not imply equal cost if the plans define their windows differently.
Add the full formula
A flat plan multiplies all kWh by one rate. A tiered plan prices each block separately. A time-of-use plan sums the kWh in each band times its band price. Add daily charges for each day, monthly charges for the entered billing months, and annual fees prorated using days/365. Apply only the documented tax and discount treatment.
Check what the source excludes
An energy-only rate must not be compared directly with an all-in bill. Delivery, riders, levies, demand charges and conditional credits can change the result. Each imported record lists its scope and omissions. The workbench labels its output as modeled components; it does not claim a complete market search or guaranteed savings.
Inspect the sensitivity
Change usage and time-period shares to see whether the apparent advantage survives. Keep an exit fee and a welcome credit out of the recurring cost. A first-period advantage can disappear after a credit expires or a fixed price ends. Take the exported worksheet back to the supplier before switching.
HAUSE Energy editorial team · reviewed 2026-10-26. Calculation and coverage limits are documented in the methodology.