A spokeswoman for Wesfarmers Chemicals, Energy and Fertilisers, another company supplied by Santos, said its operation had not been affected to date.

“We will continue to work with our customers, and the broader market, to meet demand,” she said.

Miners Rio Tinto and Gold Fields, which also have gas supply contracts with Santos, declined to comment.

When Santos shut the platform down gas on Sunday, supply to the WA market dropped 13 per cent compared to the day before, according to the WA gas bulletin board.

Production from Santos’ Varanus Island processing facility plummeted from 249 terajoules to 20 terajoules. This was partially offset by about 60 extra terajoules from Santos’ Devil Creek plant and about 40 terajoules from Woodside’s North West Shelf plant.

Woodside and Chevron, along with Santos, are the major suppliers of gas to WA.

A Chevron spokesman said its Gorgon domestic plant, which can produce about 300 terajoules a day, would return to full capacity on Wednesday after a few days at half capacity due to routine maintenance.

The US major does not plan any maintenance in coming months on its Gorgon plant or its Wheatstone facility, which is producing about 200 terajoules a day.

Woodside has the small 25-terajoules-a-day Pluto domestic gas plant and a large underutilized 630-terajoules-a-day plant at its North West Shelf LNG plant.

Woodside declined to comment on how it might help the undersupplied WA gas market.

This week the Perth-based company delivered a cargo of liquefied natural gas to Europe where gas is fetching record prices after supply from Russia was reduced when it invaded Ukraine.

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