How Smart Power Metering Works for Landlords in Malaysia

How smart power metering works for landlords is usually a digital sub-meter on each room or unit circuit, installed after the main Tenaga Nasional Berhad (TNB) meter. Not every sub-meter is a prepaid meter. Some devices only measure kilowatt-hours (kWh). Prepaid-capable meters add credit and a relay, but landlords can usually leave the prepaid feature off and recover costs later from the measured usage.

Landlords track usage in a dashboard or app. When prepaid is on, tenants top up before they use power, the same way they would a prepaid mobile plan. Either way, this is not TNB’s own Smart Meter. TNB bills the supply account; the landlord meter is how landlords allocate and recover the costs from room electricity consumption.

TNB smart meter versus landlord WiFi sub-meter

A TNB Smart Meter records premise usage and sends readings to TNB for monitoring and billing under Advanced Metering Infrastructure (AMI). Account holders can view consumption history in the myTNB app. TNB states that Smart Meters are provided and installed free for registered customers, and that its radio-frequency devices are tested and certified by SIRIM and comply with Malaysian Communications and Multimedia Commission (MCMC) safety rules.

TNB also reports that more than 5.6 million customers are already served by smart meters, with the remaining rollout under Regulatory Period 4 (RP4) scheduled for completion by 2027 under an Incentive-Based Regulation (IBR) framework approved by the Energy Commission (Suruhanjaya Tenaga).

A landlord WiFi sub-meter is a private device installed downstream of that licensed meter. Products marketed to bilik sewa (rented rooms) and co-living operators measure room-level kWh. Many also support prepaid credit and a relay that can switch off electricity when credit reaches zero, but the hardware is still a private sub-meter. It does not replace TNB’s meter, and it does not pay the TNB bill.

	TNB Smart Meter	Landlord WiFi / 4G sub-meter
Purpose	Utility billing and myTNB insights	Room or circuit measurement and cost recovery
Who bills	TNB bills the registered user	Landlord recovers from tenant (prepaid credit or later invoice)
Cut-off	TNB account / programme rules	Relay when room credit is zero (only if prepaid is enabled)
App	myTNB	Vendor or platform app / owner dashboard

How smart power metering works for landlords in practice

Sub-meters measure each room after the main TNB meter

In a typical multi-room property, how smart power metering works for landlords starts after the main supply: power still enters through one TNB meter and one distribution board. Each rental circuit (e.g. a room) then passes through its own sub-meter before the room’s lights, sockets, and aircond. The sub-meter’s first job is to measure that circuit’s energy so landlords can allocate cost fairly instead of splitting one bill by headcount.

Many sub-meters stop at measurement only. Landlords read the kWh each month and recover the cost after the bill has arrived. Prepaid-capable meters add a credit balance and a relay. On those systems, landlords can usually choose to turn prepaid on so tenants pay first, or leave it as metering only and invoice after usage.

Relays stop supply when prepaid credit reaches zero

A relay is the switching component inside a prepaid-capable meter. When prepaid is enabled and remaining credit hits zero, the control module opens (i.e. disconnect) the relay so current cannot flow on that circuit until credit is restored. That is how pay-first, use-later is enforced at room level without chasing a monthly payment. If landlords run the same meter in metering-only mode, usage is still recorded, but electricity is never switched off.

Top-ups put tenants on a pay-first workflow

When prepaid is on, tenants pre-pay for electricity costs in Ringgit. On a basic setup, the meter multiplies measured kWh by a flat RM/kWh rate the landlord configured and deducts from that balance. Low-balance alerts are common on modern systems; when credit is empty, the relay opens until someone tops up again.

Owner dashboards replace monthly meter rounds

Manually copying meter readings is the old landlord routine. It means driving out to each property, recording the meter reading, calculating the conversion rate and amount in Ringgit, and then waiting for tenants to pay their share. Sometimes arguments ensue. How smart power metering works for landlords today is different: a smart meter and an online app replaces all that.

Most landlord WiFi meters stop at measuring kWh and applying a flat conversion rate by hand. Platforms such as PowerLah go a few steps further: they calculate charges from the latest TNB tariff and the property’s usage bands, then automate credit top-ups and deductions so landlords with multiple properties and many rooms don’t waste time updating a spreadsheet every month.

End-to-end flow from install to restore

1. A licensed electrician installs each sub-meter on the correct room circuit after the main TNB meter and distribution board, following Malaysian electrical safety practice.
2. Landlords set the billing mode and house rules in writing: prepaid with a disclosed RM/kWh approach, or metering only with recovery later.
3. The meter joins WiFi (commonly 2.4 GHz) or a cellular option so the app can sync balances and commands.
4. If prepaid is on, tenants top up and usage is deducted from the credit in real time. For platforms that support them, low-balance alerts are also sent. If metering only is on, the dashboard still records kWh for later recovery.
5. With prepaid enabled, the meter pauses electricity when credit reaches zero for that circuit. A successful top-up restores electricity immediately without the landlord needing to attend the property.

PowerLah’s own onboarding follows a similar path: site audit, professional install, cloud pairing, tenant invite, then day-to-day automation. That is one concrete example of how smart power metering works for landlords end to end, not a requirement to use any single brand.

Who still pays the TNB bill

Sub-meters allocate and collect at room level. They do not change who TNB invoices. That distinction matters for how smart power metering works for landlords in Malaysia. TNB’s owner–tenant FAQ is clear that owners can either complete a Change of Tenancy before move-in (making the tenant the registered user, while the owner loses the right to instruct TNB disconnection if the tenant defaults) or keep monitoring usage and payment patterns through myTNB.

For one property with many rooms, Change of Tenancy per occupant is usually impractical. Most operators keep the master account, settle TNB themselves, and use room sub-meters to recover each room’s share, either prepaid or from measured usage after the fact.

WiFi, offline behaviour, and when 4G helps

Remote dashboards need connectivity. Understanding how smart power metering works for landlords includes knowing what happens when WiFi drops.

Many WiFi prepaid meters need a 2.4 GHz network for remote control. On some devices, if WiFi drops, metering and credit deduction can continue while app control pauses until the connection is restored. That behaviour is vendor-specific and landlords should confirm it for the hardware they buy.

Where building WiFi is unreliable, operators sometimes use portable broadband or 4G-capable meters so top-ups and status checks do not depend on a tenant’s router.

Fairness and trust

The fairness gain is simple: heavy aircond users pay for their own kWh, and frugal roommates stop subsidising them. Showing tenants their own usage history reduces fights over who owes what, because allocation starts from measured data, not guesses and assumptions. That fairness is a core reason how smart power metering works for landlords in shared rentals.

What further builds that trust is plain disclosure. Landlords should clearly specify the RM/kWh, prepaid or metering-only rules, and what happens at zero credit in the tenancy or house rules before the tenant moves in, and keep those rules consistent for every room. Without that disclosure, how smart power metering works for landlords can still feel opaque to tenants.

Frequently asked questions

What to do next

If equal-split bills and weekend meter-reading rounds are failing landlords, the practical core of how smart power metering works for landlords is simple: a sub-meter per room circuit, a clear prepaid or later-recovery rule, and a master TNB account the landlord still controls. For a product-shaped walkthrough of meter, credit, and dashboard together, see how PowerLah works. Related reading on this site will cover prepaid rooms as a billing model and buyer criteria.