How Tariff Savings Are Calculated
This page shows the exact slot-by-slot maths behind your savings, using the same assumptions and scenario engine as the detailed analysis view.
Live System Sizing
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1) Inputs Used
Each day is split into 48 half-hour slots. For every slot we evaluate import, export, and tariff rates before summing to a net daily cost.
Tariff Rate Inputs
Battery & Solar Assumptions
2) Core Formula (Per Slot and Per Day)
For each slot i: cost contribution = import cost minus export credit. Daily total is the sum over all 48 slots.
slotCost_i = (gridImport_i x importRate_i / 100) - (gridExport_i x exportRate_i / 100)
dailyCost = sum(slotCost_i for i = 1..48) dailySaving = currentDailyCost - scenarioDailyCost annualizedSaving = dailySaving x 365
Current Scenario
Better Tariff Scenario
Otto Ideal Scenario
3) Scenario Differences
All scenarios use the same day and slot structure, but differ in rates, dispatch rules, and flexibility assumptions.
Current
Better Tariff
Otto Ideal
4) Worked Example (6 Half-Hour Slots)
Sample rows below are taken directly from today’s 48-slot run. Each row shows energy, rates, and net contribution for all three scenarios.
| Slot | Cur Imp kWh | Cur Exp kWh | Cur Rates p | Cur Slot £ | Better Imp | Better Exp | Better Rates p | Better Slot £ | Ideal Imp | Ideal Exp | Ideal Rates p | Ideal Slot £ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sample subtotal (6 slots) | £0.00 | £0.00 | £0.00 | |||||||||
5) Daily & Annualized Savings Summary
Daily values come from all 48 slots. Annualized values are a simple daily × 365 estimate.
Current Daily Net
£0.00
Better Tariff Daily
£0.00
Otto Ideal Daily
£0.00
Better Tariff Saving
£0.00/day
Otto Ideal Saving
£0.00/day