Factbox-Why were millions of Pakistanis without electricity?

A man sits outside his shop during a country-wide power breakdown in Karachi, Pakistan January 23, 2023. REUTERS/Akhtar Soomro

SINGAPORE (Reuters) - Millions of Pakistanis were left without electricity for the second time in three months after a grid failure on Monday, affecting nearly all parts of the country - from the capital Islamabad in the north to Karachi in the south.

Here's a look at what happened, and the immediate prospects for Pakistan's power grid.