4:18 P.M. UPDATE: NV Energy reports that power has been restored to the majority of customers in the valley. 123 remain without power.
LAS VEGAS (KTNV) -- About 3,800 customers are without power in the South end of the valley as of 3:53 p.m. Sunday.
NV Energy says the outage is due to an equipment failure. The power should come back on around 6:15 p.m.