Workers ride on an motor rickshaw through an aluminium ingots depot in Wuxi, Jiangsu province in this September 26, 2012 file picture. REUTERS/Aly Song/File Photo

By David Lawder | WASHINGTON

WASHINGTON The Obama administration on Thursday launched a new complaint against Chinese aluminum subsidies at the World Trade Organization, accusing Beijing of artificially expanding its global market share through cheap state-directed loans and subsidized energy.

The complaint, which seeks consultations with Beijing over the matter, likely will add to rising trade tensions between the world's two largest economies as President-elect Donald Trump prepares to take office next week with pledges to reduce U.S. trade deficits with China as a top priority.

The U.S. Trade Representative's office said the complaint claims that China's actions in the aluminum sector violate WTO rules prohibiting subsidies that cause "serious prejudice" to other members of the trade body.

The complaint argues that "artificially cheap" state-directed loans and coal, electricity and alumina for the Chinese aluminum sector causes such prejudice by undercutting global prices and artificially expanding China's market share.

"China gives its aluminum industry an unfair advantage through underpriced loans and other illegal government subsidies," President Barack Obama said in a statement accompanying the announcement.

"These kinds of policies have disadvantaged American manufacturers and contributed to the global glut in aluminum, steel and other sectors," Obama said. "We're taking action to protect the workers - at home and around the world - who are hurt every day by these policies. That's what we've done since day one."

U.S. Trade Representative's office said China's capacity to produce aluminum more than quadrupled between 2007 and 2015, while global prices fell approximately 46 percent. China now produces more than half of the world's aluminum.

At the same time, U.S. primary aluminum production decreased by 37 percent, even though overall U.S. consumption of the metal increased. Nine of 14 U.S. aluminum smelters have halted production since 2011, with only one operating at full capacity, the U.S. trade office said.

The pending complaint follows an October request for a WTO case against China's aluminum trade practices by six U.S. senators concerned about 15,000 lost jobs in the sector in recent years.

"When China drives down aluminum costs by cheating, Ohio workers and manufacturers pay the price," Senator Sherrod Brown, an Ohio Democrat, said in a statement late on Wednesday.