Emit Solar | Home Solar Panels | Easy Ownership
Solar savings depend on your system size, roof, usage pattern, tariff structure, and the rules in place at the time.We do our best to make the estimate realistic and transparent. You can explore the numbers yourself using our Solar ATAP calculator →
We believe it’s the most robust calculator currently available, giving you control over the key assumptions behind your savings estimate:
Here’s what we include, what we usually leave out, and why.
We start by estimating how much Solar Electricity your system can generate over a year.
This is generally based on:
For our base estimate, we use an annualised assumption of around 3.4 Peak Sun Hours (PSH) per day.
For example:
10kWp system x 3.4PSH x 365 days = approximately 12,410kWh per year
This gives a more balanced annual estimate instead of assuming every month performs like the sunniest month.
Some months will generate more, some less. That’s normal.
2. We Estimate How Much Solar You Use Directly
Not all Solar Electricity is used the same way.
Some is used directly in your home during the day, while the rest may be exported to the grid under Solar ATAP.
For our base estimate, we assume a typical direct usage percentage based on your bill size and expected household pattern.
These assumptions are based on our analysis of homes we have installed, so they reflect typical usage patterns rather than inflated figures to make the savings look better.
For example, for a home with a RM500 monthly TNB bill, we may assume around 30% direct solar usage.
Note: You can adjust this in our calculator to reflect your own household’s daytime usage pattern and see how it changes your estimated savings and payback.
This matters because direct usage gives the highest savings.
When solar is used directly, it reduces the electricity you import from TNB – including applicable components such as:
Exported solar is still credited, but it is treated differently under Solar ATAP.
That’s why the assumed direct usage percentage is an important part of your savings estimate.
Good to know: Your tariff tier may change after solar
Because direct solar usage reduces your TNB import, your post-solar bill may fall into a lower tariff tier.
For example, if you normally import 1,500kWh, and 500kWh is supplied directly by solar, your TNB import drops to 1,000 kWh.
This may shift you from the higher tariff rate of RM0.5443/kWh to the lower rate of RM0.4443/kWh.
Where applicable, our estimate reflects this by calculating your post-solar bill based on expected TNB import after direct solar usage.
3. We Estimate Your Export Credits
After estimating how much solar you use directly, we estimate how much excess solar may be exported to the grid.
Under Solar ATAP, exported solar is credited against your TNB bill based on the applicable programme rules.
However, export credits are not unlimited.
They can offset up to 100% of your Energy charge. Any excess beyond that may not be credited or carried forward, depending on the applicable Solar ATAP terms.
This is why we do not simply assume that every kWh generated gives full savings.
We estimate:
That gives a more realistic savings estimate.
Good to know: This is why system sizing matters
Under Solar ATAP, bigger is not always better.
If your system generates far more than your home can use or offset, some excess export may not deliver additional savings.
That’s why our estimates also consider how much solar your home can realistically benefit from, not just how many panels can fit on your roof.
4. We generally exclude AFA
We generally don’t include AFA in our base estimates.
Why?
Because AFA shifts every month based on global fuel prices. It may be:
So when AFA is a surcharge, you pay more for electricity imported from TNB while your export credit stays the same. This can make your actual savings lower than estimated.
When AFA is a rebate, you pay less for imported electricity while your export credit remains unchanged. In that case, your actual savings may be slightly higher.
Because AFA moves up and down, we leave it out of our base calculation to keep the estimate more stable and easier to compare.
However, we’re working on adding AFA to our calculator in the coming weeks, following requests from users who want to see how it affects their savings estimate.
5. We Factor in EEI Where Applicable
EEI (Energy Efficiency Incentive) can affect your post-solar TNB bill.
If solar reduces your TNB import, it may change how EEI applies to your bill.
For example, part of your bill reduction may come from Solar ATAP export credits. However, EEI does not apply to the export-credit portion in the same way it applies to imported electricity.
That means the EEI impact needs to be adjusted properly, so the same savings are not counted twice.
Where applicable, we factor this into the estimate to give a more realistic picture.
This may make our projected savings look slightly lower compared to estimates that ignore EEI – but it also makes the numbers more honest.
Solar estimates are more complex than simply multiplying generation by tariff, and we want you to understand what your savings are actually based on.
6. We add in SST and KWTBB
Your post-solar TNB bill may still include charges such as SST and KWTBB, depending on your estimated import after solar.
Where applicable, we factor these into your post-solar bill estimate based on how much electricity you are still expected to import from TNB.
This matters because solar used directly at home does not appear as TNB import, so it can reduce exposure to these charges.
Exported solar, however, works differently. It is credited against your bill under Solar ATAP, but it does not reduce your import in the same way direct usage does.
In most cases, excluding them would make your projected savings higher – so our numbers tend to be on the conservative side. This helps give a more realistic view of your expected bill after installation.
What to Keep in Mind
Even with a careful estimate, solar savings are still projections.
They are based on current rules, available information, and reasonable assumptions at the time of calculation.
Malaysia’s tariff and billing structures are complex, and we spend significant time testing different scenarios to make our estimates as accurate as possible. Even then, we may occasionally get something wrong.
If you spot anything that looks off, let us know.
Much of your savings depends on government policies – and those can change
Solar savings in Malaysia are closely tied to government programmes like the Solar ATAP scheme, which lets you export unused electricity back to the grid. These policies are set by regulators and can be revised, reduced, or restructured at any time.
Our calculations reflect the rules in effect at the time of writing. Future policy changes – whether in your favour or not – could affect how your savings actually play out. It’s one of those variables that’s genuinely outside anyone’s control.
Every home is different – even with the same solar system
Two houses on the same street with identical solar setups can produce noticeably different results.
Our estimates are based on “average home”, they’re projections based on typical conditions — not a guaranteed outcome.
Spotted something that looks off? Have a question about your specific numbers?