Solar100 Malaysia Electricity Savings Guide

Can Solar Panels Reduce My TNB Electricity Bill?

Last updated: July 2026

Yes. Solar panels can reduce the amount of electricity your home or business purchases from TNB by supplying solar electricity during daylight hours. Eligible surplus generation may also be exported under the applicable Solar ATAP arrangement for an energy offset.

Quick Answer Solar panels can reduce a TNB electricity bill through two main routes: using solar electricity directly while it is being generated and receiving an eligible energy offset for surplus electricity exported to the grid. However, solar does not automatically eliminate the entire bill, and actual savings depend on system size, daytime usage, roof conditions, tariff components, export treatment and system performance.

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How Do Solar Panels Reduce a TNB Electricity Bill?

Solar photovoltaic panels convert sunlight into electricity. When the solar system is generating, the electricity can be used by appliances, air-conditioning, lighting, pumps, computers and other electrical loads within the property.

Every unit of solar electricity used directly may reduce the amount of electricity that would otherwise need to be purchased from TNB at that time.

Direct Solar Consumption

Solar electricity is used immediately by appliances operating during daylight hours, reducing electricity imported from the grid.

Surplus Solar Export

Where eligible, solar electricity that is not used immediately may be exported to the grid for an energy offset under Solar ATAP.

The basic flow is:

Solar panels generate electricity from sunlight
The property uses available solar electricity first
Grid electricity supplies any remaining demand
Eligible surplus solar electricity may be exported
The applicable export value may appear as an energy offset
The final bill reflects remaining applicable usage and charges

Important: Solar panels reduce grid electricity consumption; they do not simply apply a fixed percentage discount to the total TNB bill.

What Is Solar Self-Consumption?

Solar self-consumption is the portion of solar electricity used directly within the property while the system is generating.

For example, if a solar system is producing electricity at midday while the home is operating air-conditioning, a refrigerator, computers and a water pump, part or all of that demand may be supplied by solar.

Common daytime loads may include:

Air-conditioning
Refrigerators and freezers
Computers and home-office equipment
Washing machines
Water pumps
Swimming-pool pumps
Electric vehicle charging
Kitchen appliances
Commercial machinery
Lighting and ventilation

Higher Self-Consumption Can Improve Bill Reduction: Using solar electricity directly can be valuable because it immediately reduces the electricity that must be purchased from the grid.

How Does Solar ATAP Affect My TNB Electricity Bill?

Solar ATAP was introduced for new applications from January 2026 as Malaysia’s rooftop solar continuation programme.

Under the applicable mechanism, eligible customers may generate solar electricity for their own use and export eligible surplus generation to the grid for an energy offset.

Homeowners should confirm:

Whether the TNB account is eligible
The applicable system-capacity limit
The required Solar ATAP application process
Whether technical assessments are required
How exported energy is measured
How the energy offset is calculated
How the offset appears on the TNB bill
The applicable contract period
Whether unused offsets can be carried forward
What happens when the programme period ends

Solar ATAP Is Primarily a Self-Consumption Programme: Homeowners should not size a system solely to produce as much exported electricity as possible without first understanding the applicable offset value and programme terms.

Why Might My TNB Bill Not Become Zero?

Solar can substantially reduce electricity purchased from the grid, but it does not necessarily remove every component appearing on a TNB bill.

Night-Time Electricity Solar panels do not generate electricity at night. Grid electricity may still be needed unless the property has a compatible battery system.

Low-Sunlight Periods Rain, heavy cloud cover, shading and seasonal conditions may reduce solar generation.

Demand Above Solar Output If household demand is greater than current solar production, the difference is supplied by the grid.

Non-Energy Bill Components Certain fixed, minimum, tax, levy, service or other applicable charges may remain.

System Availability Faults, maintenance, inverter shutdowns or communication issues may temporarily affect generation.

Export Treatment Exported energy may be valued differently from electricity used directly within the property.

Bill Reduction Is Not the Same as Bill Elimination: Be cautious of any provider that guarantees a zero TNB bill without reviewing consumption patterns, tariff components, roof conditions and programme rules.

What Determines How Much Solar Can Reduce My Bill?

The percentage reduction differs from one property to another. A provider should prepare a project-specific estimate rather than relying on a general marketing figure.

Monthly electricity consumption
Daytime electricity usage
Night-time electricity usage
Proposed solar-system capacity
Available roof area
Roof orientation and angle
Shading from trees or buildings
Solar-panel efficiency
Inverter performance
System losses
Weather conditions
Maintenance and cleanliness
Applicable TNB tariff components
Solar ATAP export-offset treatment

Why Does Daytime Electricity Usage Matter?

Solar panels generally produce the most electricity during daylight hours. A property that consumes more electricity during this period may use a larger portion of its solar generation directly.

Higher Daytime Consumption

Suitable for homes with occupants during the day, home offices, daytime air-conditioning, pumps, appliances or EV charging.

Higher Night-Time Consumption

The system may export more daytime surplus while the household continues purchasing more electricity after sunset.

Some households may improve direct solar usage by shifting flexible activities to daylight hours, where practical.

Run washing machines during the day
Schedule water pumps during solar hours
Charge an electric vehicle during daylight
Use timers for selected appliances
Cool rooms before evening peak use
Schedule pool filtration during the day

Any load-shifting decision should still consider safety, comfort, appliance requirements and the household’s actual routine.

How Does Solar-System Size Affect My TNB Bill?

A larger system can produce more electricity, but a larger system does not automatically provide the best financial outcome.

System Situation	Possible Effect	What to Check
System Is Too Small	Solar may cover only a limited portion of daytime electricity demand.	Whether the system can reasonably address the property’s main daytime loads.
System Is Properly Sized	Generation may align more closely with consumption and financial objectives.	Electricity history, daytime usage, roof conditions and future demand.
System Is Oversized	A larger share of generation may be exported instead of used directly.	Export-offset value, extra installation cost and programme capacity limits.
System Is Heavily Shaded	Actual generation may be lower than the headline panel capacity.	Shading analysis, panel layout and the provider’s generation assumptions.
Future Usage Increases	More solar may be consumed directly after adding EVs, cooling or other electrical loads.	Whether future consumption assumptions are realistic and documented.

Ask Why the Capacity Was Recommended: The installer should explain how the proposed kWp capacity relates to your electricity bills, daytime load, usable roof space and Solar ATAP arrangement.

What May Change on My TNB Bill After Installing Solar?

Before Solar	After Solar
Most or all electricity consumed by the property is purchased from the grid.	Part of the daytime electricity demand may be supplied by solar.
Electricity imported from the grid reflects the property’s full usage pattern.	Grid imports may decrease when solar generation is available.
No rooftop solar export is recorded.	Eligible surplus generation may be exported and measured.
No Solar ATAP energy offset applies.	An eligible energy offset may be applied according to current programme terms.
The property relies on grid electricity at all times.	The property still relies on the grid when solar generation is insufficient or unavailable.
No solar monitoring information is available.	The owner may be able to monitor generation through an inverter or system application.

The exact bill layout and treatment depend on the applicable tariff, metering arrangement, programme rules and customer category.

How Can I Estimate My Potential TNB Bill Savings?

A useful estimate requires more than multiplying the number of panels by a standard savings percentage.

Prepare the following information:

At least several recent TNB bills
Monthly electricity consumption in kWh
Approximate daytime consumption
Property type and location
Single-phase or three-phase supply
Roof type and usable area
Roof orientation
Roof and shading photos
Planned future electrical loads
Preferred installation budget

A provider’s estimate should explain:

Proposed capacity in kWp
Estimated annual solar generation
Expected direct self-consumption
Expected exported surplus
Applicable export-offset assumptions
Estimated annual bill reduction
Panel degradation assumptions
System-loss assumptions
Maintenance assumptions
Estimated financial payback

Savings Are Estimates: Actual results may differ because of weather, household behaviour, shading, equipment performance, outages, maintenance and future tariff or programme changes.

What Should I Check in a Solar Quotation?

A quotation should clearly show what is being installed and how the provider estimated the expected bill reduction.

Legal name of the contracting company
Proposed system capacity in kWp
Number of solar panels
Panel brand, model and wattage
Inverter brand and model
Proposed roof layout
Estimated annual generation
Self-consumption assumption
Export assumption
Solar ATAP application scope
Mounting and waterproofing work
Electrical installation work
Monitoring system
Product and performance warranties
Inverter warranty
Workmanship warranty
Operations and maintenance support
Total price, payment schedule and exclusions

Generation Estimate Ask how weather, roof orientation, shading and system losses were included in the calculation.

Self-Consumption Estimate Ask how the provider calculated the percentage of solar electricity expected to be used directly.

Export Estimate Confirm how much generation is expected to be exported and how it has been valued.

Bill-Savings Estimate Confirm which tariff components are assumed to be reduced and which charges may remain.

What Common Mistakes Can Reduce Solar Savings?

Choosing a system based only on the lowest price
Installing without reviewing recent TNB bills
Ignoring daytime and night-time usage patterns
Oversizing the system without checking export value
Ignoring roof shading
Installing on a roof that needs replacement soon
Accepting unrealistic generation estimates
Not checking exact equipment models
Ignoring inverter and workmanship warranties
Not monitoring the system after installation
Failing to maintain the system where necessary
Assuming the TNB bill will automatically become zero

Frequently Asked Questions

Can solar panels really reduce my TNB bill?

Yes. Solar panels can supply electricity used by the property during daylight hours, reducing the amount purchased from TNB. Eligible surplus generation may also receive an energy offset under Solar ATAP.

Can solar reduce my TNB bill to zero?

It is possible for some customers to achieve a very low bill, but a zero bill should not be assumed. Night-time usage and other applicable bill components may remain.

Do solar panels reduce electricity use at night?

Solar panels do not generate electricity at night. The property normally uses grid electricity after sunset unless it has a compatible battery and backup arrangement.

What happens to solar electricity I do not use?

Where the system and account are eligible, surplus electricity may be exported to the grid and treated according to the current Solar ATAP energy-offset mechanism.

Will a larger solar system always save more money?

Not necessarily. A larger system costs more and may export a greater proportion of its generation. The financial result depends on consumption, export treatment, roof conditions and system price.

How many TNB bills should I provide for an assessment?

Several recent bills are more useful than a single bill because they help the provider identify consumption patterns and seasonal changes.

Does cloudy weather stop solar panels from working?

Solar panels can still generate electricity under cloudy conditions, but output may be lower than during strong sunlight.

Do I need a battery to reduce my TNB bill?

Not automatically. A grid-connected solar system can reduce daytime grid consumption without a battery. Battery suitability depends on backup needs, night usage, cost and the overall system design.

Who calculates my expected TNB bill savings?

The selected solar provider should prepare the project-specific generation and savings estimate after reviewing your electricity and property information.

Does Solar100 guarantee the estimated savings?

No. Solar100 supports provider discovery and quotation comparison. Actual savings depend on the system, property, electricity usage, weather, programme rules and provider assumptions.

The information on this page is provided for general educational and comparison purposes. Electricity tariffs, Solar ATAP rules, metering arrangements, energy-offset calculations, taxes, levies and other billing components may change. Actual solar generation and TNB bill reduction depend on the property, electricity-consumption pattern, roof conditions, equipment, weather, system design, maintenance and proposal prepared by the selected solar provider. Solar100 does not guarantee a zero electricity bill, fixed savings percentage, system performance, financial return, approval outcome, installation quality or warranty result.

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