The storm, registered as a super typhoon before losing strength after sweeping southern Taiwan, made landfall in the early hours of Thursday near the major city of Xiamen.
Pictures on state media showed flooded streets in Xiamen, fallen trees and crushed cars, as rescuers evacuated people using boats. There were no reports of casualties.
Around 1.65 million people were without power across Fujian province on Thursday, more than 300,000 of them in Xiamen, local media said. Parts of the city also suffered water supply disruptions and some windows on tall buildings shattered, state news agency Xinhua said.
The report said it was the strongest typhoon to hit that part of the country since the founding of Communist China in 1949 and the strongest so far this year anywhere in the world.
Dozens of flights and train services have been cancelled, state television added, disrupting travel at the start of the three-day mid-autumn holiday.
Tens of thousands of people had already been evacuated as the storm approached and fishing boats called back to port.
One person died and 38 were injured in Taiwan, the authorities said, as the typhoon hit the southern part of the island on Wednesday.
Meranti was a Category 5 typhoon, the strongest classification awarded by Tropical Storm Risk storm tracker, before it made landfall on the mainland and has since been downgraded to Category 2.
Typhoons are common at this time of year, picking up strength as they cross the warm waters of the Pacific and bringing fierce winds and rain when they hit land.
Meranti will continue to lose strength as it pushes inland and up towards China’s commercial capital of Shanghai, but will bring heavy rain.
Typhoon Meranti cuts power and shatters windows as it hits China
15 September 2016
Read: 1811
Typhoon Meranti has hit south-eastern China bringing strong winds and lashing rain and cutting power in what state media said was the strongest storm of the year globally.
