Power has been restored to the wastewater treatment plant in Ballinasloe, but water restrictions will remain in place today while the reservoir refills.
The treatment plant lost power on Thursday after widespread outages caused by damage from Storm Ellen.
Irish Water imposed water restrictions in the area overnight on Thursday to preserve a full supply for Portiuncula Hospital.
Power was successfully restored to the water treatment plant last night and reservoirs are beginning to refill.
Water has been restored to Creagh area this morning and it will take some time for pressure to rebuild in the network. Water supply will be restored to Derrymullan/Station Road this afternoon.
There will be restrictions on water supply across the scheme today while the network refills and tankered water is being brought in to help expedite the process of refilling reservoirs to the south of Ballinasloe town.
There may be restricted supply at night to Eyrecourt, Laurencetown, Kiltormer, Meelick and Clonfert over the weekend to ensure daytime supply.