Melbourne residents have been warned that they could endure power outages on Friday as Australia’s second-largest city is forecast to experience its hottest day in a decade.

The Victoria state capital, with a population of 5 million, is set to reach 44 degrees Celsius (111 degrees Fahrenheit). That would be Melbourne’s hottest day since Feb. 7, 2009 — a day of catastrophic wildfires that than is remembered as Black Saturday.

That day, the temperature soared to 46.4 C (115.5 F). Wildfires killed 173 people and razed more than 2,000 homes in Victoria.

Scores of wildfires are raging in southeast Australia, with authorities warning the fire risk is high.

Victoria Energy Minister Lily D’Ambrosio said three power generators had shut down on Friday, as infrastructure struggled to keep up with demand.

The roof to Rod Laver Arena is closed during the women's semifinal between Petra Kvitova of the Czech Republic and United States' Danielle Collins due to extreme heat at the Australian Open tennis championships in Melbourne, Australia, Thursday, Jan. (AP Photo/Mark Schiefelbein)
The roof to Rod Laver Arena is closed during the women’s semifinal between Petra Kvitova of the Czech Republic and United States’ Danielle Collins due to extreme heat at the Australian Open tennis championships in Melbourne, Australia, Thursday, Jan. (AP Photo/Mark Schiefelbein)
Spectators watch the women's semifinal between Japan's Naomi Osaka and Karolina Pliskova of the Czech Republic on Rod Laver Arena after the roof was closed due to extreme heat at the Australian Open tennis championships in Melbourne, Australia, Thursday, Jan. (AP Photo/Aaron Favila)
Spectators watch the women’s semifinal between Japan’s Naomi Osaka and Karolina Pliskova of the Czech Republic on Rod Laver Arena after the roof was closed due to extreme heat at the Australian Open tennis championships in Melbourne, Australia, Thursday, Jan. (AP Photo/Aaron Favila)
Petra Kvitova of the Czech Republic waits as the roof of Rod Laver Arena is closed due to extreme heat during her semifinal against United States' Danielle Collins at the Australian Open tennis championships in Melbourne, Australia, Thursday, Jan. (AP Photo/Kin Cheung)
Petra Kvitova of the Czech Republic waits as the roof of Rod Laver Arena is closed due to extreme heat during her semifinal against United States’ Danielle Collins at the Australian Open tennis championships in Melbourne, Australia, Thursday, Jan. (AP Photo/Kin Cheung)
The roof of Rod Laver Arena is closed during the women's semifinal between Petra Kvitova of the Czech Republic and United States' Danielle Collins due to extreme heat at the Australian Open tennis championships in Melbourne, Australia, Thursday, Jan. (AP Photo/Andy Brownbill)
The roof of Rod Laver Arena is closed during the women’s semifinal between Petra Kvitova of the Czech Republic and United States’ Danielle Collins due to extreme heat at the Australian Open tennis championships in Melbourne, Australia, Thursday, Jan. (AP Photo/Andy Brownbill)