As electricity costs and solar policies in Malaysia continue to evolve, residential solar photovoltaic (PV) systems are increasingly being considered not only for energy savings and sustainability, but also as a long-term household investment.
For homeowners in the Klang Valley, Penang, Johor Bahru and other parts of Peninsular Malaysia, the financial return from a solar PV system depends on several factors: system size, installation cost, household electricity consumption, daytime energy usage, roof conditions, solar generation, financing costs and the applicable TNB tariff.
This article provides a practical framework for evaluating residential solar ROI under Malaysia’s current Solar Accelerated Transition Action Programme (Solar ATAP).
Understanding the Current Solar Policy: Solar ATAP
The previous NEM 3.0 programme ended on 30 June 2025. From 1 January 2026, residential rooftop solar participation is governed by Solar ATAP, administered by SEDA Malaysia.
Solar ATAP allows residential consumers to use electricity generated by their solar PV system for their own consumption. Excess electricity can be exported to the grid and credited against the electricity bill according to the programme’s applicable energy-charge mechanism.
For domestic consumers, the current Solar ATAP capacity limits are:
- Single-phase supply: up to 5 kW
- Three-phase supply: up to 15 kW
A technical assessment may be required depending on the installation capacity and electrical connection.
Solar ATAP contracts have a 10-year tenure. After the 10-year period, the solar PV system remains for self-consumption and exported energy is no longer offset under the Solar ATAP mechanism.
SuRIA Home Rebate in 2026
For eligible Malaysian residential customers participating in Solar ATAP, the Government introduced Sustainable Rebate & Incentive Assistance (SuRIA) Home in 2026.
The current incentive provides:
- RM600 per kWac
- Maximum rebate of RM3,000 per household
- Available to eligible Malaysian citizens who have not previously received a SolaRIS cash rebate
- Allocation is on a first-come, first-served basis
- Eligible systems must be successfully commissioned by 31 December 2026, or until the available allocation is exhausted, whichever comes first.
This rebate can materially reduce the effective upfront cost of a residential solar installation and should therefore be considered when calculating ROI.
The Current TNB Residential Tariff
The old five-tier residential tariff structure of 21.8 sen/kWh to 57.1 sen/kWh is no longer the current tariff structure.
From 1 July 2025, TNB’s domestic tariff was restructured into separate energy, capacity, network and retail charges.
For domestic customers using up to 1,500 kWh per month, the published rates are:
| Charge | Rate |
|---|---|
| Energy charge | 27.03 sen/kWh |
| Capacity charge | 4.55 sen/kWh |
| Network charge | 12.85 sen/kWh |
| Retail charge | RM10/month |
For monthly consumption above 1,500 kWh, the energy charge increases to 37.03 sen/kWh. The RM10 monthly retail charge is waived when monthly consumption is 600 kWh or below.
Other items, including the Automatic Fuel Adjustment (AFA), Energy Efficiency Incentive and applicable taxes, can affect the final electricity bill.
Therefore, solar ROI should not be calculated simply by assuming that every solar kWh is worth 51.6 sen or 57.1 sen. The actual value depends on the household’s tariff, consumption and how much solar electricity is used directly or exported.
Why Self-Consumption Matters
A residential solar system generally provides the strongest economic value when generated electricity is consumed directly in the home.
For example, solar generation during the day can supply:
- Air conditioning
- Refrigerators and freezers
- Water pumps
- Home offices
- Washing machines
- Water heaters
- Pool equipment
- EV charging
- Other daytime household loads
The more electricity a household consumes while the solar system is generating, the greater the opportunity to reduce electricity purchased from the grid.
This is particularly relevant for households with high daytime consumption.
Estimating Residential Solar Payback
A simple payback calculation is:
Payback Period = Net Solar Investment ÷ Annual Electricity Savings
Where:
Net Solar Investment = System Price − Applicable Rebate
For example, if a solar system costs RM25,000 and the homeowner receives a RM3,000 eligible rebate:
Net Investment = RM25,000 − RM3,000 = RM22,000
If the system subsequently produces an average electricity saving of RM450 per month:
Annual Saving = RM450 × 12 = RM5,400
Estimated simple payback:
RM22,000 ÷ RM5,400 ≈ 4.1 years
This is an illustrative calculation only. Actual savings depend on the installed system, household consumption, solar generation, export level, tariff and other bill components.
Typical Residential System Sizes
There is no single solar system size that is financially optimal for every house. The correct size should be determined from the property’s electricity consumption, electrical supply, available roof area and Solar ATAP requirements.
As a practical planning range:
Terrace House
Typical system: approximately 4–6 kW
The final size depends on the property’s electrical supply and roof area. A smaller system may be appropriate for a household with moderate electricity consumption, while a larger system may make sense for a high-consumption home with sufficient daytime load.
Semi-Detached House
Typical system: approximately 6–10 kW
Larger roof areas and higher electricity consumption can make solar particularly attractive, especially where the household has substantial daytime air-conditioning, home-office or EV loads.
Detached / Bungalow
Typical system: approximately 8–15 kW
Larger properties may have sufficient roof space and electricity demand for a larger PV system. However, system sizing should still be based on actual consumption and the property’s electrical connection rather than house type alone.
These ranges are planning examples, not guaranteed recommended system sizes.
Regional Solar Performance
Klang Valley, Penang and Johor Bahru all have viable conditions for residential rooftop solar. However, it is not appropriate to assume that one city will always deliver a specific fixed kWh/kWp/year output.
Actual generation depends on:
- Roof orientation
- Roof pitch
- Shading
- Panel temperature
- System design
- Inverter efficiency
- Weather conditions
- Soiling
- Panel degradation
- Installation quality
For this reason, a proper solar proposal should use the property’s actual roof layout and shading conditions rather than applying a generic regional generation figure.
1. Klang Valley
Areas including Petaling Jaya, Shah Alam, Subang Jaya, Puchong, Bangi and Kuala Lumpur contain a large number of landed residential properties suitable for rooftop solar.
The main factors affecting ROI are usually:
- Roof orientation and usable roof area
- Shading from neighbouring buildings
- Household air-conditioning consumption
- Daytime occupancy
- Electricity consumption profile
Households with significant daytime electricity usage can generally achieve better solar utilisation than homes that are empty throughout most daylight hours.
2. Penang and Northern Malaysia
Penang and surrounding areas also offer strong potential for residential rooftop solar.
As with other parts of Peninsular Malaysia, actual system output should be estimated from the specific property rather than assuming a fixed regional production figure.
Roof shading, orientation and household consumption remain more important to the individual project’s ROI than simply comparing one city against another.
3. Johor Bahru and Iskandar Malaysia
Johor Bahru and the surrounding Iskandar Malaysia region have a growing number of large landed residential developments and households with substantial electricity consumption.
Solar can be particularly useful where homeowners have:
- Large air-conditioning loads
- Home-office consumption
- Swimming pools
- Water pumps
- EV charging
- Other significant daytime loads
EV charging can be especially valuable when scheduled during periods of solar generation, because the homeowner can use more of the electricity produced by the PV system directly instead of exporting it.
Cash Purchase vs Financing
Financing changes the cash-flow profile of a solar investment but does not change the underlying solar generation.
For example:
| Factor | Cash Purchase | Bank / Personal Financing | Credit Card / BNPL |
|---|---|---|---|
| Initial payment | Higher | Lower | Lower |
| Interest cost | None | Depends on lender | Depends on provider |
| Monthly repayment | None | Depends on loan | Depends on plan |
| Solar savings | Depends on system | Depends on system | Depends on system |
| Overall ROI | Generally strongest before financing costs | Reduced by interest | Reduced by financing charges |
A financing arrangement should therefore be evaluated using the actual interest rate, tenure, fees and monthly repayment, rather than assuming a standard 3.5% rate.
SEDA confirms that Solar ATAP systems can be purchased through cash, bank loans or credit-card financing, with the system owner remaining responsible for the system and its maintenance.
A More Realistic ROI Example
Consider a hypothetical residential solar system with:
- System price: RM25,000
- Eligible SuRIA Home rebate: RM3,000
- Net investment: RM22,000
- Estimated annual electricity savings: RM5,400
The simple payback would be approximately:
RM22,000 ÷ RM5,400 = 4.1 years
If annual savings were RM4,000 instead, the payback would be:
RM22,000 ÷ RM4,000 = 5.5 years
If annual savings were RM6,000:
RM22,000 ÷ RM6,000 = 3.7 years
This demonstrates why quoting one universal payback period for every terrace house, semi-detached house or bungalow can be misleading.
What Can Improve Solar ROI?
Homeowners can improve the financial performance of their solar investment by:
- Sizing the system correctly
Avoid significantly oversizing a system relative to the property’s electricity demand. - Increasing daytime consumption
Use appliances, air conditioning, water heating or EV charging when solar generation is available where practical. - Reducing shading
Shading can reduce the output of affected panels and should be considered during system design. - Choosing an appropriate system design
Panel layout, inverter selection and roof conditions can affect actual generation. - Using the available rebate
Eligible homeowners should consider the SuRIA Home rebate when calculating their net investment. - Comparing financing costs
A low monthly payment does not necessarily mean a lower total investment. Compare the total amount repaid.
Understanding Long-Term Returns
Solar PV systems typically have a much longer operating life than their initial payback period.
Once the system has recovered its initial investment, subsequent electricity savings can provide additional financial value, subject to:
- Panel degradation
- Inverter replacement or servicing
- Maintenance
- Changes in electricity tariffs
- Changes in household electricity consumption
- Solar ATAP programme rules
- Future regulatory changes
For this reason, homeowners should consider both simple payback and long-term cash flow when assessing a solar investment.
An IRR calculation can also be used for a more detailed financial analysis, but the result is highly dependent on the assumptions used for system price, electricity savings, degradation, maintenance, financing and future tariff rates.
Conclusion
Residential solar in Malaysia remains a potentially attractive long-term investment, but the economics should be calculated using the property’s actual electricity consumption and the current Solar ATAP framework.
The outdated five-tier TNB tariff should not be used for current 2026 ROI calculations. Instead, homeowners should consider the current tariff structure, expected solar generation, direct self-consumption, export credits, installation cost and any eligible SuRIA Home rebate.
For many landed properties, a properly sized solar PV system can provide a reasonable payback period while reducing long-term exposure to electricity costs.
The most reliable way to determine the expected ROI is therefore to assess the property’s actual electricity bills, roof conditions, solar generation potential and proposed system price rather than relying on a generic payback figure.