(Reuters) - The Canadian government has guaranteed another C$1 billion ($731.05 million) in commercial loans for the Trans Mountain pipeline expansion, taking the total government-backed loan facility to C$19 billion, Trans Mountain's quarterly earnings statement showed on Thursday.

The expansion project, which has so far cost C$34 billion, nearly triples capacity to ship oil from Alberta to Canada's Pacific coast to 890,000 barrels per day. It started commercial operations on May 1 after years of delay.

($1 = 1.3679 Canadian dollars)

(Reporting by Nia Williams in British Columbia; Editing by Leslie Adler)