On August 4, more than 100 million people were affected by a massive blackout that affecting most of the Java island; Banten, Jakarta, West Java, parts of Central Java, and Yogyakarta. The blackout began as early as 11:50 local time, when Jakarta MRT authorities began to detect the loss of electrical supply, rendering its trains inoperable and requiring people stuck inside to evacuate from it. Jakarta LRT and KRL Commuterline also suffered from the blackout making TransJakarta the only mass transit transportation remaining in operation at the time of the blackout. Go-Jek and Grab had major problems due to lack of internet services. The governor of Jakarta, Anies Baswedan made TransJakarta and Jakarta MRT services free of charge until the day ends. Most of the traffic lights stopped functioning, causing traffic congestions. The initial blackout lasts around 9 hours where at 21:00 local time power to most of the affected areas has been restored, although power to some rural and residential areas in Jakarta has not been restored yet past midnight. Some areas initially had its electricity back up by midnight or later, only to have its electricity cut off again, causing almost 20 hours of blackout in total. Initially, the PLN (Indonesia's state electricity company) stated that cause of the outage was due to disruptions in a number of plants in Java, but later said that the cause was due to a disruption in the Ungaran-Pemalang high-voltage power line.