Dec 18 (Reuters) - AGL Energy Ltd AGL.AX :
* CURRENTLY ASSESSING LENGTH OF ANY OUTAGE THAT MAY OCCUR AT LIDDELL UNIT 3 AS A RESULT OF TRANSFORMER INCIDENT
* WAS A TRANSFORMER INCIDENT AT UNIT 3 OF AGL'S LIDDELL POWER STATION IN NEW SOUTH WALES
* INFORMED AUSTRALIAN ENERGY MARKET OPERATOR THAT LENGTH OF OUTAGE MAY BE UP TO 2-1/2 MONTHS