Why Is My TNB Electricity Bill Suddenly High?

Many Malaysians are noticing a bigger Automatic Fuel Adjustment (AFA) or fuel surcharge item on their Tenaga Nasional Berhad (TNB) bill, just as the weather seems to be getting hotter and we're using more air-conditioning. Here is a simple breakdown of what is going on, why this charge keeps changing, and what you can do to keep your bill under control.

The AFA is a monthly surcharge shown on your TNB bill that reflects changes in the cost of fuel and related generation expenses. Think of it as a mechanism that keeps the fuel portion of your electricity price aligned with real-world costs. When fuel or foreign exchange rates rise, the AFA rises; when they fall, the AFA can drop. The Energy Commission or a ministerial decision declares the final AFA rate expressed in sen per kilowatt-hour. TNB projects fuel and foreign exchange costs and sets an AFA projection for billing. Once actual generation costs are known, differences are reconciled in later months' AFAs. That is why the published AFA is an evolving number rather than a fixed tariff.

Recent increases have been noticeable. For the period of 1 to 30 June 2026, the AFA stood at +2.59 sen per kilowatt-hour. For 1 to 31 July 2026, it rose to +3.59 sen per kilowatt-hour, partly subsidised by the Electricity Industry Fund. TNB also published a three-month forecast showing larger increases ahead: August at +8.33 sen per kilowatt-hour, September at +8.94 sen per kilowatt-hour, and October at +8.04 sen per kilowatt-hour. These projections signal continued pressure on generation costs.

How do global events like the US-Iran tensions affect your bill? Fuel for some power plants comes from imported oil, diesel or gas, and many contracts are priced in foreign currencies. Geopolitical events such as the current US-Iran tensions in West Asia can tighten global fuel supply, spike oil and liquefied natural gas prices, and push up the ringgit-dollar exchange rate. Higher commodity prices and a weaker ringgit increase the cost of fuel purchases for generators; those added costs flow through the AFA mechanism into consumer bills.

Who gets exemptions and relief? According to the TNB website, about 85 percent of domestic customers consuming 600 kilowatt-hours or less monthly remain exempt from AFA, the retail charge, and 8 percent SST. Customers consuming 300 kilowatt-hours or less are also exempt from the renewable energy fund. For July 2026, part of the AFA rise was mitigated by a RM206 million contribution from the Electricity Industry Fund, which serves as a targeted subsidy to shield consumers from sudden spikes in their electricity bills.

How does AFA affect your monthly electricity bill? AFA is charged in sen per kilowatt-hour. Multiply the AFA rate by your monthly consumption to estimate the surcharge. For example, if the AFA is +3.59 sen per kilowatt-hour and you use 400 kilowatt-hours, that adds about RM14.36 to your bill. Households under the stated exemptions see no AFA on their bills up to the threshold.

Beware of time-based rates. Time-based rates charge different prices depending on when you consume electricity. Common formats include Time-of-Use, which charges higher prices in peak hours and lower in off-peak hours, and Critical Peak Pricing, which imposes very high prices during a few system-stress hours. Shifting energy use such as laundry, charging electric vehicles, and water heaters to off-peak hours lowers bills and eases demand during peak heat. Time-based rates also encourage investment in smart and chargeable appliances that can run on batteries.

What to watch next? AFA is forward-looking and responsive to global fuel markets and exchange rates. With geopolitical risks and heatwaves pushing demand, AFA is likely to remain a variable factor in the coming months. Check official announcements from the Energy Commission and TNB for updated AFA rates and monitor your household consumption to manage costs.

How to manage your electricity consumption? The short-term way to blunt rising bills is to manage cooling use, since air conditioners are usually the biggest single household load. Raise the thermostat to 24 to 26 degrees Celsius, as each degree lower increases consumption. Use a fan with your air conditioner to allow comfortable setpoints a bit higher. Clean or replace filters monthly for efficient airflow. Seal gaps on windows and doors and use reflective blinds or curtains to cut heat gain. Use economy or sleep modes and avoid long periods of wide-open cooling when rooms are empty. Maintain outdoor unit clearance and schedule professional servicing if it has been a while. Consider ceiling fans and natural ventilation during cooler hours.

The AFA surcharge is a reflection of real-world fuel costs, and with geopolitical tensions and rising global energy prices, it is likely to remain a variable factor in the coming months. While exemptions protect the majority of households, those consuming above 600 kilowatt-hours per month will see the impact. By understanding how the AFA works and adopting energy-saving habits, you can better manage your electricity bills and reduce your overall consumption. Stay informed, monitor your usage, and make small adjustments to keep costs under control.