How this calculator works
Estimate a time-of-use electricity bill from peak and off-peak consumption, rates, fixed charges, and a load-shifting scenario.
Time and energy both matter
A time-of-use plan assigns different prices to defined windows. The same monthly kWh can produce a different bill depending on when EV charging, water heating, laundry, cooling, and other flexible loads operate.
Model only loads that can actually move
The calculator tests a shift from peak to off-peak hours without changing total kWh. Do not assume essential heating, cooling, cooking, or medical loads can always move.
- Check weekday, weekend, holiday, and seasonal schedules.
- Include delivery rates if they also vary by time.
- Confirm whether demand charges apply separately.
Compare the full rate plan
A lower off-peak rate does not automatically make a plan cheaper. Peak prices, fixed charges, minimum bills, demand charges, export credits, and seasonal definitions can outweigh savings from shifted energy.
Frequently asked questions
What is a blended electricity price?
It is total modeled charges divided by total kWh. It summarizes the result but does not replace the underlying peak and off-peak rates.
Does shifting load reduce energy use?
Not necessarily. This scenario keeps total kWh constant and changes only when the electricity is consumed.
Are demand charges included?
No. Residential demand charges require a separate maximum-kW calculation unless explicitly added to the fixed-charge input.
Use equipment documentation, your utility rate schedule, and measured data when they are available.