Reading Your Bill: Tiered Pricing and Peak/Off-Peak Rates
Residential electricity in many regions uses a tiered pricing system: the more you use in a month, the higher the unit price. Under a common two-tier scheme, the first 240 kWh per month costs about 0.49 yuan/kWh, the next block (241-400 kWh) about 0.54 yuan/kWh, and usage above 400 kWh enters a third tier near 0.79 yuan/kWh. The tier resets at the end of each calendar month, so heavy usage early in the month still starts at tier one. Many regions also offer peak/off-peak time-of-use rates. Peak hours (usually 8:00-22:00) cost slightly more, while off-peak hours (22:00-8:00) cost less, with a gap of roughly 0.2-0.3 yuan/kWh. If you own an electric vehicle, an electric water heater or other high-power appliances, shifting that usage into off-peak hours can add up fast. Take a 3 kW water heater running 2 hours a day in off-peak hours: about 180 kWh a month, and at a 0.25 yuan price gap you save roughly 45 yuan a month on that single appliance.How Much an Appliance Uses: Power Times Time
Every appliance can be estimated with one formula: Energy (kWh) = Power (kW) × Hours used. One kilowatt-hour is one "unit" of electricity, so a 2000 W air conditioner running 1 hour uses 2000÷1000×1 = 2 kWh. Let us run a few realistic examples. A 1.5-ton air conditioner draws about 1100 W in cooling; 8 hours a day means about 8.8 kWh, or 4.75 yuan a day at 0.54 yuan/kWh — roughly 143 yuan a month, the biggest summer item. A 220-liter fridge uses about 0.8 kWh a day, around 24 kWh and 13 yuan a month. A 60 W fan on 10 hours a day uses just 0.6 kWh — about 11 yuan a month. Always-on devices are easy to ignore but add up: a 40 W router running 24/7 uses about 350 kWh a year, roughly 170 yuan.What Is Normal: Reference Ranges and Three Ways to Save
As a rough reference for monthly electricity spending: a single person living alone, 60-100 yuan; a couple, 100-180 yuan; a three-person household running air conditioning in summer, 200-350 yuan; households heating with electric heaters in winter, 400 yuan or more. If your usage pattern and season are normal but your bill clearly exceeds these ranges, it is worth investigating item by item. Saving money comes down to three directions. First, shift high-power usage to off-peak hours — washing machine, water heater and EV charging. Second, cut appliance consumption — set air conditioning to 26°C or above in summer and below 20°C in winter, and note that inverter units use about 30% less than fixed-speed ones. Third, unplug standby devices — set-top boxes, chargers and speakers in standby together can add over a hundred yuan of electricity a year. To see how much of your household income goes to energy bills, check your numbers against a [salary calculator](https://calc20.top/en/salary); as a rule of thumb, keep monthly energy spending (electricity, water, gas) within 2%-3% of income. To compare the cost of different pricing plans, a [percentage calculator](https://calc20.top/en/percentage) makes the peak/off-peak price gap easy to visualize.FAQ
Q1: Is tiered pricing based on monthly or annual usage?
Most regions settle monthly and reset the tier at the end of each month, starting fresh from tier one. A few regions use an annual tier system that accumulates across the whole year. Check your bill — the current tier is usually noted next to the month's usage.
Q2: Are peak/off-peak rates worth it? Do I need to apply?
If a large share of your usage falls in off-peak hours (EV charging, electric water heating, electric heating), time-of-use rates usually save money. If most usage is during the day, the standard rate may be better. Depending on the region you may need to apply to enable peak/off-peak billing through the utility or its app.
Q3: Why is my bill so much higher than my neighbor's?
The difference usually comes from three sources: how long high-power appliances like AC and electric heating run, how many devices sit in standby, and whether you are on peak/off-peak rates. Estimate your major appliances with the power-times-time formula and compare against the bill to find the source quickly.
Q4: Do inverter air conditioners really use less power?
In long continuous-running scenarios such as cooling overnight, inverter units typically use 20%-30% less than fixed-speed units, because they slow the compressor instead of cycling on and off. With short frequent switching the difference is small, and inverter units cost more upfront, so the decision depends on your usage habits.