Cover image via SAYSYour electricity bill is affected by more than what happens inside your home.
Global factors can also affect the cost of generating electricity. For example, when the price of fuel used to generate electricity rises, or when the ringgit weakens against foreign currencies, generation costs can increase. These changes can be reflected through the Automatic Fuel Adjustment (AFA), which is updated monthly.
Think of it like fuel prices affecting the cost of an airline ticket. The flight is the same, but the cost of operating it can change when fuel becomes more expensive. Electricity generation can be affected in a similar way.
You cannot control global fuel prices or foreign exchange rates. But you can control how much electricity your household uses. The simplest way to lower your monthly bill is to practice energy efficiency behavior and keep track of your kWh consumption through the MyTNB app.
Why is my TNB electricity bill so high?
A high TNB bill can come from higher electricity use, changes in household routines, or changes in generation-related costs.
Start by checking whether your electricity usage in kWh has increased.
Common reasons include:
- using air conditioning for longer hours;
- adding new electrical appliances;
- leaving appliances on for longer;
- hot weather increasing cooling use.
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At the same time, AFA can change when global fuel prices, foreign exchange rates, or actual generation costs change.
This means a higher bill does not always have just one cause.
Why is my electricity bill still high after I use less electricity?
Using less electricity can lower your consumption, but your final bill can still be affected by other cost changes.
For example, you may use lower kWh this month, while generation costs rise because fuel prices or foreign exchange rates move higher.
That is why it helps to look at both your kWh usage and your final bill amount.
If your kWh is falling, your household is using less electricity even if the savings in ringgit are smaller than expected.
How can I lower my electricity bill at home?
Start by reducing electricity usage in your daily routine.
TNB recommends simple steps such as switching off appliances when they are not being used, using LED lighting and setting air conditioners at around 24°C.
Focus on habits that happen every day.
Reducing unnecessary appliance use for one day may have little effect. Reducing it every day throughout the month can make a much bigger difference.
What uses the most electricity at home?
Appliances that use a lot of power or run for long hours can increase your monthly electricity use.
Air conditioners are one example because they may run for several hours at a time.
But duration also matters. An appliance that uses less power can still add to your bill if it stays on for many hours every day.
When your bill is high, check appliances that:
- run for long periods;
- are used every day;
- heat or cool your home;
- are getting old (they tend to be less efficient);
- have recently been used more often.
Does hot weather increase electricity bills?
Hot weather can increase electricity use because cooling appliances usually run for longer.
Air conditioners and fans may be used more often during hot periods.
Even if the appliance itself has not changed, longer operating hours can push up total monthly kWh usage.
Keeping air-conditioning temperatures at an optimum level and avoiding cooling empty rooms can help reduce your electricity bill.
Can leaving appliances on increase my electricity bill?
Yes. Appliances that stay on longer than needed continue adding to your electricity use.
For example, an air conditioner left running in an empty bedroom for another two hours is still using electricity even though nobody is benefiting from the cooling.
The same applies to a switched-on television playing in an empty room, a rice cooker left on "keep warm" for most of the day, or a water heater running longer than necessary.
One small habit may not seem significant. But an appliance left on every day can add to your total electricity bill over the course of a month.
How can I tell if I am using more electricity than usual?
Compare your latest kWh usage with previous months.
The ringgit amount can change for several reasons. Your kWh usage shows how much electricity your household actually consumed.
For customers with a smart meter, the myTNB app provides a Daily Usage View and Energy Budget feature. These tools can help you spot higher usage before the monthly bill arrives.
Look for trends over several days or weeks, not just one unusual day.
How can I lower my bill without making my home uncomfortable?
The aim is to reduce waste, not to stop using the electricity you need.
You do not have to stop using your air conditioner, washing machine, or other household appliances.
Instead:
- avoid cooling empty rooms;
- switch off appliances when they are no longer needed;
- use lights only where needed;
- avoid running appliances longer than necessary;
- keep air-conditioning settings at an optimum level.
Small changes are easier to maintain and can reduce electricity use over time.
How do I know if my electricity-saving efforts are working?
Check whether your household is using fewer kWh over time.
Daily tracking can show short-term changes. Monthly kWh comparisons show whether your habits are making a real difference over a full billing period. If your kWh reduces, your household is using less electricity. That is the clearest sign that your savings efforts are working.
FAQ
Why did my electricity bill suddenly increase?
Your electricity use may have increased because of longer air-conditioner use, more time spent at home, or new appliances. Generation-related costs can also change because of global fuel prices, foreign exchange rates, and actual generation costs.
Why is my bill high even though I did not use more electricity?
Your final bill can be affected by more than household consumption. For domestic customers using more than 800 kWh a month, AFA can also affect the final bill.
Does air conditioning make electricity bills much higher?
Air conditioning can use a significant amount of electricity when it runs for long periods. Longer operating hours during hot weather can increase monthly kWh usage.
Does switching off appliances save electricity?
Yes. Switching off appliances when they are not needed prevents unnecessary electricity use from building up over the month.
How can I check if my electricity usage has increased?
Compare your current kWh usage with previous months. Smart-meter customers can also use myTNB's Daily Usage View to monitor usage more closely.
Why does my electricity bill change every month?
Your electricity consumption can change from month to month. Generation-related costs can also change because of global fuel prices, foreign exchange rates, and actual generation costs.
What is the easiest way to lower my monthly electricity bill?
Start practising energy-efficient habits every day, such as doing full loads of laundry, using 5-star energy-efficient appliances, and other small energy-saving habits.
Last updated: 2 October 2026
This article is sponsored by Tenaga Nasional Berhad.
