The quake, which struck at 3.08 am local time did not pose a tsunami risk, the Japan Meteorological Agency (JMA) said.
The station was closed after the devastating quake and tsunami that hit Japan in March 2011, causing the meltdown of three reactors in the Fukushima Daiichi Nuclear Power Plant complex.
Japan, situated on the Ring of Fire arc of volcanoes and oceanic trenches that partly encircles the Pacific Basin, accounts for about 20 per cent of the world's earthquakes of magnitude 6 or greater.
Power supplies have been restored to about 1.31 million of 2.95 million customers in Hokkaido by early Friday (Sept 7), following a loss of power across the island a day earlier after an quake, Japan's trade ministry said.
"We are merely inconvenienced here", one Twitter user in Sapporo reported.
Initial reports indicated that the quake left two persons dead and more than a hundred people injured.
The shutdown of a key thermal power plant may mean Hokkaido could see its electricity supplies reduced for over a week, a state minister said Thursday, following a powerful quake that rattled the island early that morning.
The quake was centred near the city of Sapporo on Hokkaido.
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Officials said there was no threat of a tsunami.
Television footage from the southeastern part of Sapporo showed crumbled roads and mud flowing onto a main street.
Japan's industry minister, Hiroshige Seko, has instructed Hokkaido Electric to restart its biggest coal plant after the station was tripped by the quake.
Power was restored to a nuclear energy plant in Hokkaido, northern Japan on Thursday after a strong natural disaster left it relying on emergency generators for 10 nervous hours, but it may be a week before lights are back on all over the major island. Several people were reported missing in the nearby the town, where a massive landslide engulfed homes in an avalanche of soil, rocks and timber.
More than 4,000 defense force soldiers have been deployed to help with rescue operations, Prime Minister Shinzo Abe said, and that number could rise to 25,000 if needed.
Among retailers, convenience store operator Lawson Inc. closed about half of its more than 600 stores in Hokkaido.
A fire broke out at a Mitsubishi Steel plant in the city of Muroran after the quake but was mostly extinguished with no injuries, a company official said.
"Only a few cartons of instant ramen were left", said Mika Takeda, who lives in the town of 10,000. The government said later in the day that supplies had been restored to about 340,000 homes.