Sengkang Punggol LRT Power Fault – Timeline Causes and Updates

The Sengkang-Punggol Light Rail Transit (SPLRT) system experienced two significant power faults within days of each other in August 2025, disrupting services for thousands of commuters across 29 stations. Both incidents, occurring on August 12 and August 15, were attributed to power supply failures at the Sengkang Depot Substation and related infrastructure issues.

SBS Transit, which operates the SPLRT under the SMRT group, confirmed that the first disruption also affected the North East Line (NEL), creating a compounded impact on public transport in the northeastern region of Singapore. The operator has since provided updates on service resumption and alternative transport arrangements for affected passengers.

This article provides a comprehensive timeline of events, details on the causes under investigation, the scope of affected stations, and the measures taken to restore services. The information reflects developments as of August 15, 2025, based on statements from SBS Transit and transport news reports.

What Caused the Sengkang Punggol LRT Power Fault?

Preliminary findings from SBS Transit indicate that both power faults originated from failures within the power supply infrastructure at or near the Sengkang Depot Substation. The first incident on August 12 involved a switchboard failure that caused a flashover in a voltage transformer, which subsequently tripped both the main and backup 22 kV power supplies simultaneously.

The second disruption on August 15 was triggered by a cable fault detected between the Farmway and Kupang stations at approximately 8:40am. According to SBS Transit CEO Jeffrey Sim, the backup switchboard that would have provided redundancy had been damaged during the August 12 incident, leaving the system operating on a single switchboard. This vulnerability meant that when the cable fault occurred, there was no backup power pathway available to maintain service continuity.

Power Infrastructure Failures

The August 12 incident revealed a critical weakness in the power distribution architecture. When the switchboard failure caused a flashover in the voltage transformer, both the primary and secondary 22 kV supplies were knocked out simultaneously. This dual failure prevented the automatic failover that redundant systems are designed to provide.

During the August 15 event, the damaged backup switchboard from three days earlier remained unrepaired. This meant that when the cable fault between Farmway and Kupang stations disrupted the network, the entire system lost power. Ten trains were left stalled across the network, requiring manual detraining procedures before recovery operations could proceed.

Service Impact Overview

The dual incidents affected all 29 stations on the Sengkang and Punggol LRT loops. On August 12, the power failure extended beyond the SPLRT, also halting North East Line services between Farrer Park and Punggol Coast stations. Station blackouts were reported at multiple locations along both lines, with commuters experiencing extended periods without service during the morning rush hour.

• Both power faults traced to failures originating at or near Sengkang Depot Substation
• August 12 incident tripped both main and backup 22 kV power supplies simultaneously
• Damaged backup switchboard from August 12 was not repaired before the second fault
• August 15 cable fault stalled 10 trains across the network
• SBS Transit CEO confirmed the interconnection between the two incidents
• All passengers, including those with mobility aids, were safely detrained

Timeline of the Sengkang Punggol LRT Disruption

The following chronology outlines key events during both power fault incidents, compiled from reports by transport operators and news outlets covering the disruptions.

August 12, 2025 Events

The first disruption began mid-morning on Tuesday, August 12. Power supply to both the SPLRT and NEL systems was interrupted following the failure at the Sengkang Depot Substation. Transit staff and emergency crews worked through the afternoon and evening to restore services, with full operations resuming approximately 10 hours after the initial fault.

1. Around 11:00am — Power fault reported; services on SPLRT and NEL disrupted
2. 11:17am — No NEL service between Farrer Park and Punggol Coast; free bus services activated
3. 11:22am — All SPLRT services suspended
4. 3:34pm — Power to Sengkang LRT restored
5. 4:04pm — Punggol LRT services resume
6. Approximately 9:20pm — Full service on both lines restored after roughly 10 hours

August 15, 2025 Events

Three days after the first incident, a second power fault occurred during the Friday morning rush hour. The cable fault between Farmway and Kupang stations triggered a system-wide outage affecting all 29 SPLRT stations. Recovery operations proceeded more quickly than the first disruption, with full bi-directional service resuming by the late afternoon.

1. 8:40am — Cable fault detected; all 29 SPLRT stations affected
2. 8:50–8:52am — Trains stalled across the network, including reports of lights going off at Punggol stations
3. 11:05am — Progressive service resumption begins on Sengkang LRT
4. 11:20am — Progressive service resumption begins on Punggol LRT
5. 12:32pm — Full Punggol LRT service restored
6. 12:54pm — Full Sengkang LRT service restored (approximately 4 hours total)
7. 3:15–5:00pm — Single-direction operation maintained for cable inspection
8. 5:15pm — Bi-directional service fully resumed

Impact and Current Status of the LRT Service

Both power faults created significant disruptions for daily commuters relying on the SPLRT for transportation in the northeastern corridors of Singapore. The incidents occurred during peak travel periods, amplifying the impact on affected passengers who faced unexpected delays and service suspensions.

Scope of Affected Stations

All 29 stations across the Sengkang and Punggol LRT loops experienced complete service suspension during both incidents. The SPLRT consists of two separate loops serving the towns of Sengkang and Punggol, and both loops were affected simultaneously during each power fault. The August 12 disruption had an even broader impact, as it also halted NEL services between Farrer Park and Punggol Coast stations, effectively disrupting train services across a significant portion of the northeastern transport network.

Station blackouts were reported at multiple locations during the August 12 incident, with commuters describing dark platforms and electronic suspension notices displayed on information boards. On August 15, witnesses at Punggol stations reported train lights going off around 8:50am as the fault took effect, leaving passengers in temporary darkness until emergency protocols were activated.

Commuter Experience During the Disruption

Commuters who relied on the SPLRT during both incidents described challenging experiences. The morning rush hour timing of both faults meant that large numbers of passengers were already onboard trains or waiting at stations when the power failures occurred. One commuter at Punggol reported that the train lights went off at approximately 8:50am on August 15, leaving passengers in the dark as the system shut down.

Safe detraining procedures were implemented for the ten trains that stalled on August 15. Transport staff assisted passengers, including those with mobility aids, in exiting the trains safely. This process, while necessary for safety, contributed to extended recovery times as crews had to manually evacuate multiple trains across different locations on the network.

Frequent users of the SPLRT expressed particular frustration with the second outage occurring just three days after the first major disruption. The recurrence of power-related issues within such a short timeframe heightened concerns about the reliability of the system and the adequacy of backup infrastructure.

Current Service Status

Full services on both the Sengkang and Punggol LRT loops were restored following the August 15 incident. As of the information available, no further disruptions had been reported after the 5:15pm resumption of bi-directional services on that day. SBS Transit has indicated that preliminary investigations into the causes of both incidents are ongoing, with particular attention being paid to the cable fault identified between Farmway and Kupang stations.

Alternative Transport Options During the Fault

To maintain mobility for affected commuters during both disruptions, SBS Transit deployed alternative transport arrangements. These included free regular bus services and dedicated bridging bus services that stopped at designated locations near the affected LRT stations.

Bus Bridging Services

Free bus services were activated following the suspension of LRT operations on both August 12 and August 15. These services picked up passengers at designated stops positioned near the affected stations, providing a ground-level alternative to the suspended rail services. The bridging buses operated along routes that paralleled the LRT loops, connecting commuters to interchange stations where they could access other rail lines.

During the August 12 incident, the free bus services also covered portions of the NEL route, as that line was simultaneously affected by the power fault originating at the Sengkang Depot Substation. This multi-line impact required coordinated bus deployment to serve commuters who normally rely on both the SPLRT and NEL for their daily commutes.

Commuter Guidance

When rail services experience unexpected disruptions, commuters are advised to check for announcements at stations, monitor official SBS Transit social media channels for real-time updates, and utilize the bus bridging services deployed during service suspensions. Planning alternative routes in advance can help reduce travel delays during similar events.

For those living in the Sengkang and Punggol areas, the incidents highlight the value of familiarizing oneself with available bus routes that connect to other MRT lines, such as the Sengkang and Punggol bus interchanges, which provide connections to the North East Line and other transport options.

Confirmed Information and Areas Under Investigation

The following summarizes what has been confirmed about the August 2025 SPLRT power faults and what remains under investigation by SBS Transit and relevant authorities.

Official Responses and Statements

SBS Transit, the operator of the SPLRT under the SMRT group, has provided public updates regarding both incidents. The operator’s CEO Jeffrey Sim issued an apology via social media following the August 15 disruption, acknowledging the impact on commuters and explaining the interconnection between the two power faults.

In his statement, Sim explained that the backup switchboard damaged during the August 12 incident had not been fully repaired or replaced at the time of the second fault. This meant that when the cable fault occurred on August 15, the system was operating on a single switchboard with no redundancy available. The operator has committed to investigating the causes and implementing measures to prevent similar recurrences.

The second power fault on August 15 was directly related to damage sustained during the August 12 incident. Our system was operating with reduced redundancy, which contributed to the extent of the disruption.

— SBS Transit CEO Jeffrey Sim, via social media

Preliminary findings released by SBS Transit indicated that the August 12 incident originated from a switchboard failure causing a flashover in a voltage transformer at the Sengkang Depot Substation. This equipment failure tripped both the main and backup power supplies simultaneously, a scenario that prevented the expected failover to backup systems. The August 15 cable fault between Farmway and Kupang stations was identified as the trigger for the second system-wide outage, with the previously damaged backup infrastructure unable to provide the expected redundancy.

Summary and Service Recovery

The Sengkang-Punggol LRT system experienced two significant power faults in August 2025, disrupting services for approximately 10 hours on August 12 and 4 hours on August 15. Both incidents originated from power supply failures at the Sengkang Depot Substation, with the second disruption exacerbated by damage sustained during the first event that left backup systems unavailable.

All 29 stations across the Sengkang and Punggol LRT loops were affected during both incidents. The August 12 disruption also impacted the North East Line between Farrer Park and Punggol Coast. SBS Transit deployed free bus services and bridging transport during both events, and all passengers, including those requiring special assistance, were safely evacuated from stalled trains.

Full services have since been restored on both LRT loops, with bi-directional operations resuming on August 15 at 5:15pm. Preliminary investigations are ongoing, and the operator has committed to addressing the infrastructure vulnerabilities identified during these incidents. Commuters are encouraged to monitor official updates from SBS Transit for the latest information on service status and any further developments. For those seeking housing options near reliable transport connections in Singapore, consider reviewing current rental listings that may offer convenient access to alternative commute routes.

Frequently Asked Questions