Around 100 thousand homes and businesses could still be without power next week.
Crews from the UK are expected to arrive this week to help with the remaining 246 thousand outages following Storm Éowyn.
That's down from a peak of 768 thousand on Friday - with the ESB describing it as "by far the worst storm" it's ever experienced in terms of customers losing supply and the scale of damage to the network.
ESB Networks Regional Manager Brian Tapley says the rain yesterday hampered repair works