Manila, Oct. 10 -- Three transmission lines in the Mindanao Grid are currently unavailable following the magnitude 7.4 earthquake that hit Manay, Davao Oriental around 9:43 a.m. Friday, the National Grid Corporation of the Philippines (NGCP) said.

In an advisory, NGCP identified these as the Davao-Toril 69kV line, Nabunturan-Asuncion 69kV line, and Nabunturan-Masara 138kV line.

The 69kV lines, it said, "serve parts of Davao City, Davao del Norte, and Davao de Oro."

On the other hand, NGCP said "power transmission services in Northeastern, North Central, and Southwestern Mindanao remain stable."

Energy Secretary Sharon Garin, in a briefing, said four distribution utilities (DUs) experienced tripping after the tremor -- the Davao Orient...