WattShed Shift
Which rate plan actually costs less, on your usage.
Every rate here is one you typed from your utility's published tariff sheet. WattShed ships no rate database, so nothing is prefilled: enter your annual usage, then add each plan under consideration with its fixed monthly charge and its rate, either a flat cents-per-kWh price or a time-of-use schedule with its own periods and prices.
For a time-of-use plan, you also enter the usage split: what share of your annual kWh falls in each period. That split is your own estimate, not a measurement, and the answer moves with it. When two plans land close together, the gap between them can be smaller than the error a rough split introduces, so treat a close result as a toss-up, not a verdict.
This is arithmetic over the rates and the usage split you enter, not a source of either. Informational only, not utility billing. Everything computes in this browser; nothing you enter is stored.
Your usage
Annual electricity use
Total kWh used over a year, from a utility bill or annual summary.
Define the rate plans
A card for every plan you're comparing
Nothing is prefilled. Add each plan under consideration: its name, its fixed monthly charge, and its rate, either one flat cents-per-kWh price or a time-of-use schedule with its own periods and prices.
No rate plans yet. Add one below, or load the example to see the tool with data already in it.
Result
Define at least one complete rate plan on the left to see a result.
Arithmetic over the rate plans and the usage split you set above. Not a bill, and not tied to any actual utility tariff.
What moves the answer
Three inputs that decide which plan wins, and how easily that can flip.
The usage split you estimate
Move a few points of usage from off-peak into the on-peak window and a time-of-use plan's annual cost can climb past a flat plan that looked more expensive a moment ago. The split is the single input most likely to flip a close result.
Fixed charges that don't move with usage
Two plans can quote nearly the same energy rate and still land far apart once their fixed monthly charges are added in. A plan with a lower rate but a higher base charge can lose on a low-usage account and win on a high-usage one.
How close is too close to call
A few dollars a year between plans is not a real answer, it's about the size of the error a rough usage split introduces. Treat a narrow spread as a tie and revisit it once you have a better read on when you actually use power.
A cheapest result here reflects only the rates, fixed charges, and usage split you entered above. It is not a bill, a quote, or a comparison WattShed has verified against your utility's actual tariff.