Power supplies have been restored to residents on Inis Meáin and Inis Oírr following a four day power cut.
The islands were without electricity since the early hours of Friday morning after a fault with an undersea cable. Landline phones were also down.
In a statement this evening, the ESB said that following the arrival of a specialised transformer, crews worked to connect the two generators to the island electricity system. Electricity was restored at around 9pm.
A specialised generator was already brought to Inis Oírr on Saturday, but the transformer was also needed to connect power supply.
The fault was located in a cable 2km off the island. The ESB said that following a detailed examination of the cable damage and the seabed conditions, engineers will make a decision on the best method of completing the repair.
The statement said the repair of the fault should take two to four weeks.
Earlier, Enda Conneely, a chairperson for Inis Oírr's co-op, told RTÉ’s Morning Ireland that businesses would feel the effect of the power cut for a long time because they had been unable to answer phones and email requests.
Mr Conneely, who is also a restaurant and guest house owner, said there was a queue of people at the local pub, which had a generator, waiting to charge their phones.
He said that medicines stored by the doctor in fridges were ruined, along with fridges full of food.