The states of Peninsular Malaysia – including Kuala Lumpur, Selangor, Putrajaya, Johor, Melaka, and Negeri Sembilan – lost power for several hours.
On July 27, 2022, much of the northern parts of Peninsular Malaysia, Klang Valley, Pahang and Negeri Sembilan have reported widespread blackout from 12:40 PM onwards.
[6] Investigations by TNB revealed that a faulty appliance in Yong Peng North Main Entry Substation (PMU) have triggered the power failure at 12:39 PM.
[8] The power outage affected various services including RapidKL trains, KLIA main terminal, traffic lights, and network providers like TM Unifi and Digi.
The power outage created traffic jam in Singapore side of the Causeway and Immigration and Checkpoints Authority warned travellers of "tailback from Malaysia".