Lost Allegheny Power at #7 Substation at approx 5:19pm. The diesel backup failed to start and the mine was evacuated. Power was restored to the #7 Substation at 6:51pm. The #7 fan was started on electric and the power then tripped. During that outage, the #8 elevator lost power. The power was restored on the elevator and after a round trip it was returned to service.