What will happen to my TNB bill after installed Solar Power??!

 

Above is a daily Solar Power generation chart (orange color) plotted based on actual data of a system installed in Selangor.

The Solar Power system starts to generate energy around 7am, and then slowly increases and achieves its peak power in the afternoon. 

After that, the generation reduces and stops around 7pm. Area under the orange curve is the solar energy generated (kWh).

Depending on location, day, weather etc, your Solar Power system shall have the same characteristic or daily generation curve. 

But in terms of Power generated (kWp), it is subjected to the number of PV panels or system size (kWp) you installed.

Solar Power system size and usage:

In terms of system size, Service Providers usually will design a system that generates Solar Energy which matches your TNB usage or consumption (kWh). 

The system probably generates 70% to 90% of your TNB usage depending on roof space available.

Most of the residential consumptions are like the above chart, low during daytime, and increasing during night time (blue color area).

The overlap area in the chart will be the Solar energy you consume during daytime, the balance (orange color) is the extra or excess energy you export to TNB.

The quantity of energy exported to TNB shall be close to your night time consumption…

After installing the Solar Power system, you will still receive a monthly TNB bill for the electricity you use during night time. 

But the amount you need to pay reduces significantly as you have offset it with the Solar Energy you exported to TNB. 

How your TNB bill look like:

After you install Solar Power for Net Energy Metering (NEM), you will receive the TNB bill which will indicate the quantity of energy you imported from TNB and exported to TNB..

The calculation of your net TNB bill amount shall be like the following:-

Like our normal TNB bill, in the energy imported section, TNB will bill you based on a different tier depending on the total quantity of energy you used.

For this case 533 kWh, the highest tier is RM0.516/kWh. And 233 kWh are under this tier.

On the other hand, 467 kWh of Solar Energy were exported to TNB. The tariff tier for solar energy exported will be in descending order.

Meaning that, 233 out of 467 kWh will be valued at tier RM0.516/kWh; and the 100 out of 467 kWh valued at tier RM0.334/kWh; and the balance at tier RM0.218/kWh.

Please take note that the imported energy is subjected to ICPT charge, SST and the 1.6% KWTBB. Whereas, these charges are not applied to Solar Energy exported to TNB

The difference between import charge (RM200.92) and export charge (RM182.84) will be the amount you need to pay TNB IF the imported energy is greater than the exported Solar Energy.

On the contrary, if your Solar Energy exported to TNB is greater, your TNB bill for that month will be zero. And if there is a balance of extra Solar Energy, it will be carried forward for next month.

On average, you pay 90% less for the electricity you have used…