The latest grid disturbance occurred around 8:16 am when power generation dropped to 00MW, plunging businesses, homes, and critical infrastructures into darkness.
The nationwide blackout comes four days after the grid tripped off as it was being restored after an earlier collapse on Monday.
Checks confirmed that power generation stood at 3,042 megawatts at 8 am and peaked at 3,968MW at 7 am.