How to Lower Your Electricity Bill: Find What Costs the Most

Electricity bills have a way of creeping up without you noticing: a hotter month, a new appliance, more time at home. The good news is that you don't need to sit in the dark to pay less. Most savings come from a handful of big users, and once you know how to work out what each appliance costs, it's easy to see where your money goes.

This guide shows you how to read your usage, calculate what any appliance costs to run, and the changes that make the biggest difference.

Our examples use ringgit (RM) and an illustrative rate. Tariffs differ by country and provider and change over time, so use the rate on your own bill.

Step 1: Understand your bill

Look for two numbers on your bill:

• Usage in kWh (kilowatt-hours): how much electricity you used in the billing period.
• Rate per kWh: what you pay for each unit. Some tariffs have tiers or extra charges, so your average cost per kWh is total bill ÷ kWh used.

Compare the kWh with the same month last year, not just last month. Usage naturally rises in hotter or colder months. Many providers' apps show a usage chart, which makes this quick. If you're in Malaysia, our article on smart lighting and your TNB bill shows a worked example using real tariff figures.

Step 2: Work out what each appliance costs

The formula is:

Cost = power (watts) × hours used ÷ 1,000 × rate per kWh

The wattage is usually on a sticker or plate on the appliance, or in the manual. Here are illustrations using an example rate of RM0.45 per kWh and typical wattages. Your appliances and rate will differ.

The lesson is clear. Unplugging a phone charger saves cents. Running the air conditioner one hour less a day, or more efficiently, saves far more. Focus on the top of the table first.

Monthly figures assume 30 days. Air conditioners and fridges cycle on and off, so real use varies with temperature, room size and settings.

Step 3: The changes that matter most

Cooling and heating

• Set a moderate temperature. Each degree cooler (or warmer, for heating) makes the unit work harder.
• Use a timer or sleep mode so it doesn't run all night at full power.
• Close doors and curtains in the room you're cooling, and block direct afternoon sun.
• Clean the filters regularly. Dirty filters make the unit work harder.
• Use a fan when it's enough. Fans use far less power than air conditioners.

The International Energy Agency's "Playing my part" report lists turning down heating and using less air-conditioning among the simple actions households can take to cut energy use.

Water heating

• Take shorter showers and turn the heater off when you don't need it.
• Don't leave storage heaters on all day if they have a switch or timer.

Laundry and kitchen

• Wash full loads and use cold water where possible.
• Air-dry clothes instead of using a dryer.
• Keep the fridge door shut, let hot food cool before storing it, and check the door seal.
• Use a lid when cooking and match the pot to the burner size.

Lighting and standby

• Switch to LED bulbs as old ones burn out.
• Turn off devices at the wall if they stay warm or show lights on standby, like TV boxes and game consoles.

Step 4: Buy efficient when you replace

Don't replace a working appliance just to save on electricity; the new one costs more than the savings in most cases. But when something needs replacing, check the energy efficiency label. A more efficient air conditioner or fridge can cost a bit more upfront and less every month for years. Compare the yearly energy use (kWh per year) shown on the label, and use the formula above to estimate the difference in running cost.

Inverter air conditioners, for example, adjust their speed instead of switching fully on and off, which usually uses less energy over a day of normal use.

Step 5: Check your plan

In some countries you can choose your electricity provider or plan. Australia's Moneysmart, for example, suggests comparing providers and asking your current one whether there's a cheaper plan that matches your usage. Where there's only one provider, check whether there are rebates, efficiency programmes or payment options that suit you.

Frequently asked questions

The bottom line

To lower your electricity bill, find your rate, work out what your biggest appliances cost, and change the habits that matter most: cooling, water heating and laundry. Small habits help a little; big appliances help a lot. Put the money you save straight into your emergency fund or sinking funds so it doesn't disappear into everyday spending.

How we wrote this: this guide draws on the International Energy Agency and Moneysmart (Australian Government), listed below. Wattages, usage and the RM0.45 rate are illustrations, not real tariffs or measurements. Check your own bill and appliances.