Greenland's capital restored power early on Sunday after a storm damaged a transmission cable, leaving thousands without electricity or heating through the cold winter night.
Electricity was suddenly cut off across Nuuk late on Saturday, witnesses said.
The Nukissiorfiit utility, which supplies Nuuk from the Buksefjord hydropower plant southeast of the capital, said power came back online around 4:30 a.m. (0630 GMT).
Greenlanders are used to outages, often caused by harsh weather damaging the cable, which runs through rugged terrain and spans two fjords.
Three days before the power cut, the government updated recommendations for crisis preparedness - including advice for people to keep five days' worth of water and food - in the wake of tensions over US President Donald Trump'sdemands to acquire the Danish territory.
Trump abandons threat of tariffs against European allies
Trump on Wednesday said the US would not use force to pursue his ambition to acquire Greenland and later dropped the threat of additional tariffs against some of Washington's European allies and fellow NATO members over the issue.
During an interview with Fox News Business on Thursday, Trump said he is negotiating with European officials to guarantee the United States' "total access" to Greenland.
"I mean, we're talking about it, it's really being negotiated now, the details of it, but essentially it's total access. There's no end, there's no time limit," he said.
Tobias Holcman contributed to this report.