Time-of-use savings and load shifting are different questions
First compare the bill with the same consumption. Then ask what a change in timing could do.
A plan can be cheaper without a new routine
The main comparison sends exactly the same interval data through both entered tariffs. It includes the entered energy rates, fixed charges, common delivery rate, TOU demand charge, and subtotal tax. It does not move any energy.
The timing experiment
The separate slider moves a selected percentage of peak kWh to the off-peak bucket. Its difference from unshifted TOU is moved kWh times the peak-minus-off-peak rate difference, multiplied by one plus the tax rate. Total energy and the demand charge stay unchanged. If the off-peak rate is higher, shifting can increase the estimate.
Know what the slider cannot promise
This is a sensitivity scenario, not an appliance schedule, battery simulation, or verified saving. It does not prove that your loads can move or that a new peak demand will not occur. Equipment efficiency, battery losses, comfort, and utility eligibility are not modeled.
Find the tipping point
The break-even peak share holds total consumption and measured maximum demand constant. It includes the difference in fixed charges. A shared delivery rate and a shared subtotal tax cancel out of the equality. Some tariffs never break even within a feasible 0 to 100 percent peak share, and equal peak and off-peak rates have no timing-based tipping point.
Before choosing a plan
Use the rate-plan verification checklist to confirm current tariff terms, fees, and your usage inputs before relying on the comparison.
Reference sources
These sources explain utility-rate concepts. They do not verify the sample rates or your uploaded data. Model 1.1.0.