Upper Valley power restoration estimated at 10:30 pm, Hart building serving as

Darkened streets in Rexburg. | Eric Grossarth, EastIdahoNews.com

REXBURG — Nearly 18,000 Rocky Mountain customers are without power Friday night. The outages are being reported across the Upper Valley from as far north as Ashton and south to Thornton and between Rexburg and Newdale.

The power went out just after 8:15 p.m. and is estimated to be restored by 10:30 p.m.

The Madison County Sheriff Office reports the outage began with a transformer going off at a substation in Rigby.

Rocky Mountain Power spokesperson Tiffany Erickson told EastIdahoNews.com five substations are now down due to a loss of power on a high voltage transmission line.

The exact cause of the outage has yet to be determined.

The Brigham Young University-Idaho Hart building is open for anyone who needs to keep warm, according to Rexburg Police Chief Shane Turman. Turman says officers have been checking on nursing and retirement homes and most are running on emergency generators.

EastIdahoNews.com will post updates as they become available.