SALT LAKE CITY — Rocky Mountain Power reported multiple power outages Friday night.

Around 7 p.m. it was reported that around 17,000 customers were left without power due to storm-related damage, according to the Rocky Mountain Power website. The areas affected included parts of Summit and Salt Lake Counties.

Crews were making progress and had restored power to all but about 6,000 customers when they lost a transmission line in Summit County that interrupted delivery of power from six substations, Rocky Mountain Power spokesman Jeff Hymas said. As of 10:15 p.m., 22,000 customers in Park City, Snyderville and other parts of Summit County were without power.

Hymas said it was unclear what prompted the transmission line to go down.

Just before 9 p.m., power was restored to the majority of customers in the Salt Lake Valley, but Hymas said as many as 1,600 customers in various "pockets" were still waiting for their power to be restored. He did not have an estimate as to when power would be fully restored in either Salt Lake or Summit Counties.

"We'll keep working and we'll get power restored as quickly as we can," Hymas said.

Hymas said initial outages were caused by winds that have downed powerlines and blown tree limbs into powerlines.

"If you see a downed powerline, stay away from it," he said. "Keep everyone else away and call 911 to report it."

He said customers can also call 1-877-508-5088 to report a downed powerline or get updates on power. Updates are also available on the company's website, but Hymas said outages affecting less than 500 customers are not posted. 

Emiley Morgan

Twitter: DNewsCrimeTeam