The Santos-operated Moomba plant was closed on Sunday morning after a pipe was damaged a day earlier during routine maintenance to the flare system.
The weekend outage at Moomba resulted in 13 million cubic metres of gas that normally services South Australia, NSW and ACT being severely disrupted.
Santos told the market the outage would not have any material economic impact on the company. Major gas consumer AGL said its 800,000 customers in NSW were unaffected as it was able to receive supplies from alternative sources.

