Western Australia isn't part of the national east coast electricity market, so its tariffs don't appear in the government dataset our import uses for other States. Household electricity prices in WA are set by the State Government, so there's also no market of competing plans to import. Manual entry gives you the full calculator.

For nearly all households, no. Synergy supplies homes in Perth and the south west (the SWIS network), and Horizon Power supplies regional WA. Retail choice only exists for very large users, typically businesses. Your retailer is determined by where you live.

Three things. First, check your bill: enter your rates and usage and see whether the estimated daily, monthly and yearly costs line up with what you're being charged. Second, compare tariff options: your retailer may offer more than one tariff (such as a standard anytime rate and a time-of-use option), and you can model each as its own company to see which suits your usage. Third, model changes: see what a heat pump, pool or new appliance's extra kWh actually costs per year.

Not directly. The calculator models a single anytime usage rate plus an optional controlled load, which keeps every plan comparable like-for-like. If your bill shows peak and off-peak rates, you can enter a blended rate as a rough guide: divide your total usage cost for the period by the total kWh used. Treat the result as an estimate, not an exact comparison.

Look for a section like "your usage" or "average daily usage" on your bill, usually shown in kWh per day. If your bill only shows total kWh for the billing period, divide it by the number of days in the period.