On Thursday 17 December 2020, there was a transformer incident at Unit 3 of AGL's Liddell Power Station in New South Wales, as a result of which the unit has been taken out of service. A worker at Liddell was seriously injured as a result of the incident and is receiving medical attention. AGL's priority concern is continuing to ensure he receives the required treatment at this difficult time. An investigation is under way into the cause of the transformer incident, including engagement with the relevant authorities.

AGL is currently assessing the length of any outage that may occur at Liddell Unit 3 as a result of the transformer incident. On a precautionary basis, AGL has informed the Australian Energy Market Operator that the length of the outage may be up to two and a half months, subject to the completion of this assessment. AGL notes that this estimate is highly preliminary.

AGL will inform the market of any financial impact of the transformer incident and any potential outage once these assessments have occurred. It is currently estimated that this information will be available no later than Wednesday, 23 December 2020.

Authorised for release by AGL's Market Disclosure Committee.