The outage affected customers mainly east of 8th Street and south of Mitchell.
KCP&L said they do not have a cause for the outage but will work to determine what happened. KCP&L crews worked throughout the afternoon to restore power.
An outage was also reported overnight as thunderstorms moved through St. Joseph. Sunday afternoon's outage impacted the same area as the mornings.
Crews had all power back on in St. Joseph by 5:30 p.m.