MELBOURNE, Australia—Australia's antitrust regulator has again deferred a decision on Royal Dutch Shell PLC's planned takeover of BG Group PLC, raising concerns about competition and the supply of natural gas to the domestic market.

The Australian Competition & Consumer Commission said its preliminary view of the proposed deal was that it could decrease the incentive for Shell's Arrow Energy joint venture with PetroChina Co. to supply gas domestically, which could substantially less competition in Queensland state or the eastern Australian gas market.

By reducing the supply of gas to the domestic market, the planned takeover could increase the market power of a limited number of other supplies domestically, which could lead to higher prices, the regulator said.

The ACCC has invited submissions on its concerns by Oct. 8 and said in a statement it proposes making a final decision on the deal on Nov. 12.

Shell and BG agreed the $70 billion cash and share deal in April and Australia's regulator began its review on June 11. The regulator early in September deferred a decision for two weeks to give itself additional time to consider the proposal.

The main area for overlap between the companies is in Australia's eastern Queensland state, where BG runs the $20.4 billion Queensland Curtis LNG plant at Gladstone and inland coal-seam gas fields and Shell owns substantial coal-seam gas reserves through the Arrow Energy venture.

Brazil's competition authority approved the deal in July, the first of five preconditions that Shell has said it needs to meet to close the deal. The second came earlier in September when the European Commission waved the deal through after a brief investigation, leaving China's competition authority and Australia's antitrust and foreign-investment regulators still to be cleared.

U.S. antitrust authorities approved the deal in June.

Shareholders still need to vote on the deal and are expected to receive formal documents late this year or early next year.

Write to Robb M. Stewart at robb.stewart@wsj.com

 

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(END) Dow Jones Newswires

September 17, 2015 01:05 ET (05:05 GMT)

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