By Chester Dawson 

CALGARY--The government of British Columbia on Tuesday granted key environmental permits to a natural gas export plant backed by Malaysia's state-owned energy company and two pipelines proposed for shipping gas to terminals on Canada's Pacific Coast.

The move comes ahead of a year-end deadline that Malaysian energy company Petroliam Nasional Bhd., or Petronas, has set for deciding whether to build a multibillion-dollar liquefaction plant in the province, which would cool and compress natural gas for transport overseas by tanker ship.

One of the two pipelines that received environmental assessment certificates from British Columbia is designed to connect the Petronas plant with gas fields hundreds of miles inland. The other pipeline to win approval is for a rival liquefied natural gas plant backed by British energy company BG Group PLC.

Both projects are among 18 LNG terminals proposed for shipping gas from Western Canada to global markets, particularly in Asia. None have been built yet amid concerns about construction and operational costs, and BG said last month it would push back its development timeline into next decade.

The provincial government has looked to revitalize its remote northern coast with LNG exports by tapping into surplus natural gas in North America. To induce investment, it has halved a planned provincial tax on LNG exports to 3.5% after Petronas and others complained about regulatory and tax policies.

British Columbia's environment ministry said the certificates, which are subject to a series of conditions specific to each project, were granted only after the sponsoring companies "proposed a number of significant route or design changes."

Petronas has said its LNG project, known as Pacific Northwest LNG, could cost upward of C$36 billion. It is the second planned LNG terminal to receive environmental clearance from the province after a competing LNG project sponsored by Chevron Corp. Earlier this month, yet another LNG project led by Royal Dutch Shell filed paperwork with the British Columbian government for its environmental assessment certificate.

"We welcome the positive decision from the BC Government," Michael Culbert, president of Pacific NorthWest LNG, said in a statement. He noted the project is still awaiting a federal environmental assessment certificate, another permit required before it can start development.

In April, Petronas sold a 15% stake in Pacific Northwest LNG to China Petroleum & Chemical Corp., or Sinopec. Japan Petroleum Exploration Co. and Indian Oil Corp. each have 10% stakes in the project, along with 3% owned by Brunei National Petroleum Co.

Write to Chester Dawson at chester.dawson@wsj.com

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