Over 1,600 homes and businesses are without power in Keady and surrounding areas.
Northern Ireland Electricity Networks is reporting “widespead outages” in the area.
Power losses were reported shortly before 4pm.
NIE engineers are en route to the area and, at this stage, it is being estimated that it could be 7pm before those affected are reconnected.
Keady and neighbouring Darkley, Tassagh and Granemore have all suffered loss of electricity.
No reason has yet been confirmed.