Cover image via SAYSFor many homeowners in Peninsular Malaysia, particularly those with landed properties and suitable roof space, rooftop solar can reduce electricity bills by replacing part of the electricity otherwise purchased from the grid.
During sunny hours, solar panels generate electricity that can be used directly by appliances in the home. The more solar electricity generated, the less energy you need to buy from the grid.
Over time, those monthly savings can add up. However, the amount saved depends on the size of the solar system, how much electricity the household uses during the day, roof conditions, weather, installation cost, and how the system is financed.
While solar does not lower the electricity tariff itself, it reduces how much electricity you need to buy from the grid.
How does rooftop solar reduce your electricity bill?
Solar panels generate electricity for your home during daylight hours, reducing the amount of electricity imported from the grid.
For example, imagine your home is using electricity for a refrigerator, fans, air-conditioning, and other appliances in the afternoon.
Without solar: Home electricity demand → supplied mainly by the grid
With rooftop solar: Home electricity demand → supplied partly by solar + partly by the grid
If the solar system is producing enough electricity at that moment, less electricity needs to be purchased from TNB. That reduction in grid consumption is the main way rooftop solar lowers electricity bills.
What happens when solar panels generate more electricity than the home needs?
Eligible excess solar electricity may be exported to the grid under the applicable solar programme.
Under SEDA Malaysia's current Solar ATAP framework, eligible surplus electricity may be exported and credited against electricity imported during the same billing period. For domestic consumers, the credit is based on the applicable Energy Charge and is subject to programme limits. Unused credits do not carry forward, cannot create a cash payout, and cannot offset the Automatic Fuel Adjustment.
Surplus electricity may be exported and credited only where the system is approved under the applicable programme, such as Solar ATAP, and complies with TNB, SEDA, and Energy Commission requirements.
If I'm using solar panels, do I still receive an electricity bill?
Usually, yes. Solar can reduce the bill substantially, but it does not automatically eliminate every electricity charge.
A home may still need electricity from the grid:
- at night;
- during cloudy periods;
- when household demand is higher than solar generation; or
- when the solar system is not producing electricity.
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Other applicable tariff components may also remain. Solar is therefore better understood as a way to reduce dependence on grid electricity, rather than a guarantee of a zero bill.
How do solar savings build up over time?
Solar creates long-term value by reducing grid electricity purchases month after month.
Suppose your solar system lowers the amount of electricity you need to buy from TNB every month. Those savings gradually accumulate.
A simple way to think about it is: Electricity savings + eligible export credits − installation, financing, and maintenance costs = Your net savings in the long run.
If the accumulated savings eventually recover the effective cost of installing the system, later savings contribute more directly to the long-term financial benefit. This is why solar is usually evaluated over several years rather than by looking at the first month's bill.
How long can it take for solar savings to recover the installation cost?
The payback period depends on the total system cost and the amount of money the system saves each year.
There is no single payback period for every household because electricity consumption, solar generation, daytime usage, financing terms, export credits, and installation prices vary.
A simple gross payback calculation is: Installation cost ÷ annual gross solar benefit = approximate gross payback period.
Suppose a household receives:
- RM150 a month in electricity savings; and
- RM20 a month in eligible Solar ATAP export credits
That gives a gross benefit of:
RM150 + RM20 = RM170 a month
Over one year:
RM170 × 12 = RM2,040
If the solar installation costs RM12,000:
RM12,000 ÷ RM2,040 = about 5.9 years
Under these assumptions, the gross simple payback period would be approximately 5.9 years.
This is only an illustration. Actual payback can be longer or shorter depending on system performance, electricity use, export credits, financing costs, maintenance, and future tariff or programme changes.
What determines how much money solar can save?
The biggest factors are how much electricity the system generates and how much of that electricity the household can use effectively.
| Factor | Why it matters |
| Solar system size | A suitably sized system can generate more electricity |
| Household electricity use | Determines how much grid electricity solar can replace |
| Daytime consumption | More daytime use can increase direct self-consumption |
| Roof direction and angle | Affect how much sunlight reaches the panels |
| Shading | Trees or nearby buildings can reduce generation |
| Weather | Cloud cover affects solar output |
| Installation cost | Affects how long it takes to recover the investment |
| Financing | Interest or lease payments affect net savings |
| System performance | Equipment condition affects long-term generation |
Why does the right solar system size matter?
A solar system should be matched to the household's electricity needs, rather than simply made as large as possible.
If a system is too small, it may replace only a limited amount of grid electricity. If it is much larger than the household can use effectively, more electricity may need to be exported instead of consumed directly.
A good system assessment should therefore consider:
- recent electricity consumption;
- daytime electricity use;
- usable roof space;
- shading;
- current Solar ATAP rules; and
- the cost of the proposed system.
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The more useful question is not simply "How many panels can fit on my roof?"
It is:
"How much solar electricity can my household actually use?"
Can solar protect a household from future electricity price changes?
Solar can reduce how much electricity a household needs to buy from the grid, which lowers its exposure to grid electricity costs for that portion of consumption.
For example, if solar supplies part of your daytime electricity demand, that electricity is generated on your roof rather than purchased from the grid. However, solar does not make a household completely independent from future tariff changes. Grid electricity may still be required, and tariff structures, export-credit arrangements, and other rules can change.
The benefit is therefore lower grid dependence, not complete protection from electricity price movements.
How do I know whether solar is worth considering for my home?
Start with your electricity use and your roof, not the number of panels being offered.
Useful questions include:
- Do I own or have permission to use the roof?
- Is there enough unshaded roof space?
- How much electricity do I use each month?
- How much do I use during daylight hours?
- What size system is being proposed?
- How much solar will I probably use myself?
- How much may be exported?
- What is the total installation or financing cost?
- How long would it take for expected savings to recover that cost?
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A good solar proposal should use your actual electricity consumption and property conditions rather than promise the same percentage saving to every household.
FAQ
Is rooftop solar suitable for every landed home?
No. The home still needs suitable roof space, adequate sunlight, appropriate structural and electrical conditions, and compliance with current programme requirements.un
Can a terrace house install solar?
Potentially, yes. A terrace house may be suitable if it has sufficient usable roof space, limited shading, appropriate roof conditions, and meets the applicable technical and programme requirements.
Does solar reduce my TNB tariff rate?
No. Solar does not normally change the tariff rate itself. It reduces how much electricity you need to buy from the grid.
Why is daytime electricity use important for solar savings?
Solar panels generate electricity during daylight hours. Using that electricity directly in the home reduces grid purchases immediately.
Can excess rooftop solar reduce my bill?
Yes, under the applicable programme and subject to its rules. Under Solar ATAP, eligible Domestic export credits are based on the applicable Energy Charge.
Will solar make my electricity bill zero?
Not necessarily. Homes may still import electricity at night or whenever demand exceeds solar generation, and other applicable bill components may remain.
Does a larger solar system always save more money?
No. The system should be matched to the household's electricity use, roof conditions, and current export-credit rules.
Last updated: 2 October 2026
This article is sponsored by Tenaga Nasional Berhad.
