Gas Networks Ireland has said it hopes to restore full access to the gas supply in the west by Sunday afternoon.
GNI hopes to restore gas supply in the west by Sunday
Network Safety Manager Owen Wilson said GNI is working to establish how odourless gas entered the supply chain.
The odour was not added due to a technical fault at the Shell facility at Bellanaboy - writes rte.ie.
With no smell, it is impossible to detect a gas leak.
Mr Wilson said the risk to customers is "very very low" and is "absolutely" happy with how quickly customers were told to switch off their supply.
Speaking on RTÉ's Morning Ireland, he said GNI is making good progress to return the supply to full safety levels.
It emerged last night that odourless gas from the Corrib field had been delivered onto the network and customers in Galway and Mayo were told to switch off their supplies.
The notice applies to connections in Galway city, Tuam, Headford, Ballinrobe, Castlebar, Claremorris, Westport, Crossmolina and Ballina.
The affected gas is being piped back to the Shell terminal in north Mayo, where it is being burned off.
The company said this is a standard safety mechanism but some locals are concerned at the noise and flames associated with the process, which is expected to continue throughout the day.
Inspectors from the Environmental Protection Agency are monitoring the situation.
Gas Networks Ireland said it could take up to three days before normal supplies are restored.
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