What the comparison tells you
With 600 kWh, 30% peak use, a 35¢ peak price, a 12¢ off-peak price, and a $10 fixed charge, the time-of-use total is $123.40. A 20¢ flat plan with a $10 fee costs $130. Moving 60 kWh out of peak hours reduces the time-of-use total to $109.60. All rates are examples.
Use your utility’s price periods
Peak hours are plan-specific. Use interval data to find how much energy falls in each period. This tool supports two prices and a fixed charge for each plan; it does not reproduce tariffs with more periods, tier thresholds, demand charges, minimum bills, taxes, or solar export credits.
How the break-even point works
We solve for the peak share that makes the two modeled totals equal. If the peak price is higher than the off-peak price, a lower peak share favors time-of-use. If the two rates are equal, changing the share has no effect. A threshold outside 0–100% means the plans do not cross within a possible usage split.
EIA explains time-of-day pricing and electricity price variation. Read the current tariff before making a plan change.