Power out to parts of Lake Tahoe's north and west shores

1:45 p.m. Update - Power has been restored for all customers in North Lake Tahoe.

12:45 p.m. Update - A tree has been found in the primary source line and the backup line is currently being inspected by helicopter. Liberty Utilities has an estimated restoration time of 3:00 p.m. for the over 80 customers affected.

11:40 a.m. Update - Due to fire risk, Liberty Utilities crews must inspect the entire line before energizing the backup power source. The good news is they have commissioned a helicopter to expedite this process and there will have eyes in the air soon.

NORTH LAKE TAHOE, Calif. - The power source into the Tahoe City substation has gone down, affecting customers of Liberty Utilities from Alpine Meadows to Emerald Bay and parts of Carnelian Bay.

Customers can expect to be without power at a minimum of four hours according to Liberty unless the can get power from an alternate source.

Liberty Utilities is working to get helicopter assistance to more quickly inspect the backup power line so power can be restored sooner than the expected four hours. Crews are beginning the inspection on foot and this is required to ensure there is no fire risk before energizing.

They will be providing updates throughout the day and they will be carried in this story.