FINAL UPDATE: Power has been restored to all customers except for a handful.
UPDATE: As strong winds swept over the Las Vegas valley, the outage grew to over 21,000 customers around 5 p.m.
The number diminished to 14,000 customers by 5:30 p.m. NV Energy estimates that most customers should have their power back by 7:45 p.m.
LAS VEGAS (KTNV) -- Over 12,000 customers are without power on the east side of the Las Vegas valley around 3:15 p.m. Sunday.
NV Energy says the outage was caused by an equipment failure possibly due to high winds. The power is expected to be restored before 6 p.m.