It has killed two people and injuring 66 others. Planes and fishing boats were grounded, while more than 15,000 people were evacuated, AP reported.
Typhoon Nepartak made landfall Friday morning in Taitung county before weakening to a medium-strength typhoon, the island's Central Weather Bureau reported.
Li Wei-sen, Taiwan's Central Emergency Operations Center spokesman, said the typhoon was packing winds of up to 163 kmh.
About 390,000 households had been affected by power cuts, most of them in Pingtung and Taitung counties, according to Taiwan's emergency management service. The island's railway services have been suspended, while more than 600 domestic and international flights were canceled and another 178 flights were delayed.