MELBOURNE, April 29 (Reuters) - Origin Energy Ltd (ORG) on...

MELBOURNE, April 29 (Reuters) - Origin Energy Ltd (ORG) on Friday more than doubled its outlook for earnings from liquefied natural gas this year, saying the first unit at its Australia Pacific LNG plant was producing at above its rated capacity of 4.5 million tonnes a year.

APLNG, operated by ConocoPhillips , shipped 11 cargoes in the March quarter, mostly going to China's Sinopec, and is set to start exporting from its second production unit between July and December, Origin said.

The extra volume adds to an already oversupplied global LNG market, with spot prices in Asia LNG-AS down 36 percent so far this year.

"Given the strong operational performance of Train 1 since shipment of the first LNG cargo on Jan. 9, Origin expects to recognise Train 1 revenue from March 1 2016," it said in its quarterly report.

It now expects underlying LNG earnings before interest, tax, depreciation and amortisation (EBITDA) for the year to June 2016 of between A$100 million and A$150 million, well above an earlier forecast between A$30 million and A$80 million.

Origin reported a 45-percent rise in March quarter revenue to A$316.4 million ($241.8 million) from a year earlier on the back of first sales from the APLNG project.

Production rose 65 percent to 60.9 petajoules.

($1 = 1.3084 Australian dollars)