Power outages at home in Johor (2026): what to check, how to report to TNB, and what TNB owes you

中文 · Bahasa Melayu · Bahasa Indonesia

By Jason Lim, REN 84424 · IQI Realty · Checked on 15 November 2026

This guide is for owners, tenants and buyers of houses and condos in Johor Bahru, including people moving in from Singapore, Indonesia, India and China. The short answer: when the lights go off, first check whether it is only your home (a tripped switch at your own distribution board) or the whole street. If it is the street, report it to TNB on 15454, which runs 24 hours. TNB has to meet service standards set by Suruhanjaya Tenaga, the Energy Commission, and you can claim a small credit on the bill if a qualifying outage runs past the time limits.

First minutes: is it just your home or the whole area?

Many outages turn out to be inside the home. Take two minutes to work out which kind you have.

1. Look outside. Are the neighbours’ lights, streetlights or condo corridor lights on?
2. Open your distribution board (the DB box). See whether the main switch, the residual current device (RCCB or ELCB) or a circuit breaker has dropped.
3. Reset once. Switch off heavy appliances, push the switch back up, then turn appliances on one at a time to find the culprit.
4. Do not keep forcing it. If the RCCB trips again straight away, there is likely an earth leakage, for example a wet socket or a faulty water heater. Leave it off and call an electrical contractor registered with Suruhanjaya Tenaga.
5. If the whole street is dark, it is a supply interruption (gangguan bekalan elektrik). Report it to TNB.

What you see	Likely cause	Who to contact
Only your home is off; the DB switch has tripped	Overload or a fault in your own wiring or an appliance	Reset once; if it trips again, a registered electrical contractor
Only your home is off; nothing has tripped	A fault at the meter or the service cable to your home	TNB on 15454
Your street, block or estate is off	A fault or planned work on TNB’s network	TNB on 15454; check the Power Alert page
Condo corridors, lifts or pumps are off but your unit has power	A fault in the building’s common-area supply	Management office (JMB or MC)
Sparks, a burning smell or a fallen cable	Danger	Keep away; call 15454 for TNB cables and 999 for fire or injury

If your home is older, my guide to wiring in older homes explains what a modern board should have. Work after the meter needs a registered electrical contractor.

How to report a power outage to TNB

Tenaga Nasional Berhad (TNB) is the grid operator and supplier for homes in Johor and the rest of Peninsular Malaysia. Its reporting channels, as listed by TNB and the Energy Commission in November 2026:

• Breakdowns and outages: TNB CareLine on 15454, 24 hours a day. The same number covers streetlights that are out.
• Billing and general enquiries: 1300-88-5454, 8am to 7pm on weekdays and 8am to 5pm on weekends and public holidays.
• Email: tnbcareline@tnb.com.my, which the Energy Commission lists as TNB’s complaint address. TNB also replies through its official social media pages.
• Planned outages: the Power Alert page on TNB’s website lets you pick Johor, your area and a date range to see scheduled interruptions, and there is a map view.

Have your account number, address, the start time and whether neighbours are affected ready, and mention anything you saw, such as a cable down after a storm. Write down TNB’s reference number; you need it for a claim or complaint. Tenants should report directly, then tell the landlord, since the account is usually in the owner’s name.

Planned and unplanned interruptions

A planned interruption is maintenance or upgrading work. Under the Energy Commission’s directive on TNB’s service standards (published March 2025), TNB must give at least 2 days’ notice. TNB runs preventive maintenance all year, so check Power Alert before a move-in or renovation day.

An unplanned interruption is a breakdown: a cable fault, failed equipment, a fallen tree or a problem further up the grid. Most are local and short, but grid events can hit a wide area. On 15 October 2025, a technical disruption at a gas-fired power plant in Melaka caused about 2,200 MW of load to be lost, cutting supply in parts of the Klang Valley and around Johor Bahru from about 4.12pm. TNB said supply was fully restored by 5.54pm (Bernama, 15 October 2025).

Storms also cause trips and surges; see lightning and surge protection and JB weather and monsoons.

What TNB owes you: guaranteed service levels

Suruhanjaya Tenaga sets Guaranteed Service Levels (GSL) for TNB. If TNB misses one, the customer can claim a credit on the bill. The two that matter most for outages:

Standard	What TNB must meet	Bill credit for a home	Claim by
GSL 1: how often	Listed major urban areas (including Johor Bahru): no more than 4 unplanned interruptions a year lasting over 3 hours each. Other areas: no more than 5 a year lasting over 4 hours each.	1% of the average monthly bill, or RM10, whichever is higher	Within 2 months into the following year
GSL 2: how fast, local fault	Minor (low-voltage) damage: 3 hours. Medium-voltage breakdown with an alternative feed: 3 hours in listed urban areas, 4 hours elsewhere. Without an alternative feed: 12 hours.	1% of that month’s bill, or RM10, whichever is higher	Within 2 months after the incident
GSL 2: how fast, grid event	Partial blackout: 4 hours. Total blackout: 18 hours.	As above, but depends on the Energy Commission’s investigation	Within 2 months after the incident

The credit is not automatic: you claim it, and TNB points customers to Help and Support on its myTNB portal. The amounts are small and do not pay for spoiled food or a damaged television. Other GSLs cover new connections and wrongful disconnection, with fixed credits of RM50 or RM100.

If TNB does not resolve your complaint

The Energy Commission asks consumers to complain to the supplier in writing first and keep copies. If that fails, contact Suruhanjaya Tenaga on 1-800-2222-78 or 03-8870 8500. Include TNB’s ticket or reference number and any reply letter, because incomplete complaints may be rejected.

Damaged appliances

If you believe a supply fault damaged an appliance, report it to TNB in writing with photos and repair quotes, and keep the item. Also check your home insurance: some policies cover electrical damage, others exclude it. Ask the insurer what yours pays.

Protecting your appliances, food and home

• Switch off sensitive appliances such as computers, televisions and air-conditioners at the wall. Leave one light on so you know when supply returns.
• Bring loads back slowly. When power returns, wait a few minutes, then switch appliances on one by one.
• Consider surge protection. A surge protective device at the board, fitted by a registered electrical contractor, is a sensible extra; see my surge protection guide.
• Keep the fridge and freezer shut. The US Centers for Disease Control and Prevention (CDC) says a closed fridge keeps food safe for up to 4 hours, a full freezer about 48 hours and a half-full one about 24 hours. Throw out perishable food left without power for more than 4 hours.
• Keep an outage kit: a torch, charged power bank, bottled water and key numbers (TNB 15454, management office, 999). If someone relies on powered medical equipment, ask the supplier about backup options early.
• In a flood, TNB has advised residents to call 15454 and ask for the supply to be cut; it restores supply once safe (The Sun, December 2022). Have a registered electrical contractor check the wiring before you switch back on.
• Generators: never run a fuel-powered generator indoors or on a closed balcony, because the exhaust is dangerous.

See also my guide to flood risk in Johor Bahru.

Condos: lifts, water pumps and access

In a high-rise, common property is the job of the Joint Management Body (JMB) or Management Corporation (MC).

• Lifts. Fire lifts, required under the Uniform Building By-Laws where the top occupied floor is above 18 metres, have backup power; ordinary lifts may stop (Malay Mail, January 2026). If you are stuck, press the alarm and call management or 999. See condo fire safety and lifts.
• Water. Many condos pump water to roof tanks, so upper floors can run dry once the tanks empty; see water supply disruptions.
• Access. Card readers, barriers and intercoms may stop; keep the guardhouse number.
• Who fixes it. If only corridors, lifts or pumps are off, tell management, not TNB. Common-area repairs come from the maintenance fund or sinking fund.

Before buying, ask management which systems run on standby power and when the generator was last tested; the condo management checklist has other questions.

Landed homes: gates, pumps and alarms

• Auto gates need a manual release you can find in the dark; see auto gate safety and maintenance.
• Alarms and CCTV keep working only with a battery backup; see home security for landed homes.
• Heavy loads. Homes with several air-conditioners or an EV charger sometimes need a three-phase upgrade.

What to check when you buy or rent

Ask the owner or neighbours how often the power goes off, and whether problems were in the home or on the street. Open the board: an RCCB, labelled circuits and no scorch marks are good signs, while an old fuse board means budgeting for rewiring. My subsale viewing questions and house inspection guides have more, and moving in: utilities covers transferring your TNB account.

Where to buy if this matters to you

All of Johor Bahru is on the same TNB network. What differs is the building: the wiring’s age, standby power and how well it is maintained. Areas I cover:

• Mount Austin: condos and landed estates popular with families.
• Tebrau, Setia Indah and Molek: established areas where older homes merit a wiring check.
• Iskandar Puteri: newer townships near the Second Link.
• JB Sentral and Bukit Chagar: high-rises near the CIQ, where lifts and standby power matter.
• Permas Jaya and Senibong: east-side condos and waterfront homes.
• Bukit Indah and Gelang Patah: landed estates on the west side.

Compare them on my JB property map.

More Johor living guides: Electricity and water bills in JB · Time-of-use electricity tariff · Fire safety for landed houses · Vacant home checklist · JB local councils explained

Frequently asked questions

Who do I call when the power goes off in Johor Bahru?

If the street or block is affected, call TNB CareLine on 15454 (24 hours). If only your home is off, check your distribution board first. If only condo common areas are off, call management.

How much notice does TNB give for planned power cuts?

Under the Energy Commission’s service standards published in March 2025, TNB must give at least 2 days’ notice of a planned interruption. You can check scheduled outages by state, area and date on TNB’s Power Alert page.

Can I get compensation from TNB for a long power outage?

You can claim a bill credit under Suruhanjaya Tenaga’s Guaranteed Service Levels if TNB misses a standard, for example restoring a minor fault within 3 hours. For a home it is 1% of the monthly bill or RM10, whichever is higher, claimed within 2 months. Weather, natural disasters and planned work are excluded.

Does TNB pay for appliances damaged by a power outage?

The GSL bill credit is not payment for damaged appliances. Report suspected damage to TNB in writing with photos and repair quotes, keep the item, and check whether your home insurance covers electrical damage.

How long is food in the fridge safe during a blackout?

The US CDC says a closed fridge keeps food safe for up to 4 hours, a full freezer about 48 hours and a half-full freezer about 24 hours. Throw out perishable food that has been without power for more than 4 hours.

What happens to condo lifts and water during a power outage?

Fire lifts have backup power, but ordinary lifts may stop, and upper floors can run dry once roof tanks empty. Ask management what runs on standby power.

Moving into a JB home and want it checked?

Tell me the type of home and the area. At viewings I check the board, ask about past outages and standby power, and tell you when to bring in a registered electrical contractor. You can also book an appointment, or a Zoom consultation if you are abroad.

Sources: Suruhanjaya Tenaga, Arahan Standard Prestasi Perkhidmatan Bekalan Elektrik TNB (GSL and MSL), published March 2025; TNB, Guaranteed Service Levels for residential customers, checked November 2026; TNB, Power Alert (planned outages by area), checked November 2026; TNB, Customer Charter, checked November 2026; Suruhanjaya Tenaga, Before Making a Complaint, checked November 2026; Bernama, “Power supply in outage-affected areas in Klang Valley, Johor fully restored – TNB”, 15 October 2025; The Star, “Power cuts in Klang Valley, JB after power plant in Melaka suffers disruption”, 15 October 2025; The Sun, TNB advice to contact it to cut supply when flood water rises, 21 December 2022; Malay Mail, fire safety systems every condo resident should know (UBBL fire lifts), 26 January 2026; US Centers for Disease Control and Prevention, Keep Food Safe After a Disaster or Emergency, 24 November 2025; Suruhanjaya Tenaga, how to obtain the services of a registered electrical contractor, checked November 2026

Jason Lim, REN 84424, IQI Realty Sdn. Bhd. E (1) 1584/6. General information checked on 15 November 2026, not legal, electrical or insurance advice. Service standards, bill credits and contact numbers can change; confirm with TNB and Suruhanjaya Tenaga. Electrical work must be done by a contractor registered with Suruhanjaya Tenaga. In an emergency, call 999.