Taiwan started phased blackouts islandwide yesterday after an outage at a coal- and gas-fired power plant in the southern port city of Kaohsiung.
More than six million homes were affected almost immediately on the island of 24 million people.
And the world's biggest contract chipmaker, Taiwan Semiconductor Manufacturing, said some of its facilities suffered a "brief power dip" but power had been restored.
President Tsai Ing-wen apologized for the blackouts, which also left hundreds trapped in elevators across Taiwan.
"This was not a problem with plants," she said. "The cause was the power grid. This highlights the importance of risk management of the grid."
In a text message just before the power failed early in the afternoon, the government said its grid did not have sufficient capacity after the outage at the power plant in Kaohsiung.