Time-of-Use Rate Plan Comparison
Check whether a peak/off-peak plan beats your flat rate.
Result
Formula
Calculation logicFrequently asked questions
What is time-of-use billing?
Rates change by hour: cheap off-peak overnight, expensive on-peak afternoons. Shifting laundry, EV charging, and dishwashers off-peak cuts the bill without using less energy.
How do I compare TOU against a flat rate?
Enter identical monthly kWh and your peak share. The calculator prices both plans so the cheaper one wins on math, not habit.
What peak share is typical?
Households average 20 to 40 percent on-peak. Smart thermostats and timers push it under 20.
Do weekends count as off-peak?
On most US tariffs, yes. Confirm on your utility's TOU sheet before shifting load.
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