The company responsible for a major oil spill in the Timor Sea in 2009 was fined $A510,000 in Darwin Magistrates Court on Friday.
About 70 crew members were evacuated from the Montara oil rig, about 250km off the north-west coast of Western Australia, after a blowout. Stopping the leak took more than two months.
PTTEP Australasia had pleaded guilty to four breaches of the Offshore Petroleum Act. The company has a month to pay the fine.
Chief executive Ken Fitzgerald said the company spent $A40 million in cleaning up the spill.