Why Is My TNB Bill So High?
A high electricity bill does not always mean that electricity prices simply went up. Your total monthly consumption, tariff level, AFA, taxes and several other billing components can all affect how much you eventually pay.
Enter your monthly electricity usage below and Solar100 will help identify which parts of the current TNB tariff structure may be affecting your bill.
Analyse Your TNB Electricity Usage
Enter Your Monthly Electricity Usage
You can find this number under “Jumlah Penggunaan Anda” on your latest TNB bill.
kWh
Analysis Ready
Your TNB Usage Analysis Is Ready
We will explain which tariff levels may apply to your electricity usage, possible reasons your bill is high and whether your current consumption is worth evaluating for solar.
Get My Analysis on WhatsApp Your kWh usage will be included automatically in the WhatsApp enquiry.Why Can a TNB Bill Suddenly Become Much Higher?
Your electricity bill is made up of several components. This means a higher monthly bill may be caused by more than one factor.
Important factors include:
- Total electricity consumption in kWh
- Generation Energy Charge
- Automatic Fuel Adjustment (AFA)
- Capacity Charge
- Network Charge
- Retail Charge
- Energy Efficiency Incentive, where applicable
- Service Tax, where applicable
- KWTBB contribution, where applicable
This is why two households with different monthly consumption levels may experience very different effective electricity costs.
Important Electricity Usage Levels to Know
Several monthly usage levels are particularly relevant when reviewing a General Domestic TNB bill.
300 kWh
Domestic users at this lower consumption level may receive exemptions from certain charges such as KWTBB, subject to the applicable billing rules.
600 kWh
The 600 kWh level is important because several billing treatments change once monthly residential electricity consumption goes above this point.
1,000 kWh
Residential users consuming up to 1,000 kWh may still qualify for the Energy Efficiency Incentive, with the incentive reducing as consumption increases.
1,500 kWh
High-consumption households should pay particular attention when monthly
electricity usage approaches or exceeds 1,500 kWh.
Under the current General Domestic structure, the Generation Energy rate shown on residential bills changes from 27.03 sen/kWh to 37.03 sen/kWh when total monthly consumption exceeds 1,500 kWh.
Real Example: Why Usage and Bill Amount Do Not Always Rise at the Same Rate
Solar100 reviewed two consecutive anonymised residential electricity bills from Johor.
| August 2026 | September 2026 | |
|---|---|---|
| Electricity Usage | 1,226 kWh | 1,576 kWh |
| Generation Energy Rate | 27.03 sen/kWh | 37.03 sen/kWh |
| Generation Energy Charge | RM331.39 | RM583.59 |
| Current Charge | RM632.72 | RM987.55 |
Electricity usage increased about 28.5%, while the current charge increased
about 56.1%.
The example shows why looking only at the percentage increase in electricity consumption may not fully explain a much higher monthly bill.
What Will Solar100 Analyse?
Based on the monthly kWh you provide, the analysis can help identify:
- Which general electricity usage range you fall into
- Whether important tariff thresholds may affect your bill
- Whether AFA may be relevant to your consumption level
- Whether Service Tax may apply
- Whether the Energy Efficiency Incentive may still apply
- Whether your usage is considered relatively high for a residential account
- Whether it may be worth comparing solar savings
For a more accurate review, Solar100 may subsequently ask for your latest TNB bill because billing dates, AFA rates and account-specific adjustments can affect the final amount.
Not Sure Why Your Electricity Bill Is High?
Start with your monthly kWh usage. It takes only a few seconds and no electricity bill upload is required at this stage.
Enter your kWh above → Get your personalised analysis via WhatsApp.
Frequently Asked Questions
Can you tell why my TNB bill is high just from kWh?
Monthly kWh is enough to identify several important tariff and consumption factors. However, a complete bill review may require the actual TNB bill, because AFA, billing period and account-specific charges can affect the final amount.
What happens if I use more than 1,500 kWh?
Under the current General Domestic tariff, electricity consumption above 1,500 kWh falls under the higher Generation Energy rate shown for high-consumption residential users.
Does a high TNB bill mean I should install solar?
Not automatically. Solar suitability also depends on daytime electricity consumption, roof condition, system size and current solar programme rules. However, consistently high electricity usage is a useful reason to evaluate potential solar savings.
Is this an official TNB analysis?
No. Solar100 is an independent solar information platform. Official electricity charges should always be confirmed using your TNB bill and information published by TNB or Suruhanjaya Tenaga.
Important Note
This tool provides a preliminary electricity usage analysis for general information only. Monthly kWh alone cannot determine an exact TNB bill. Actual charges may vary according to the billing period, AFA, taxes, rebates, solar credits, tariff type and other account-specific adjustments.
