Chinese oil company PetroChina has started operations at its ¥30bn ($4bn) refining and chemical complex at Dushanzi in Xinjiang’s northwestern province to boost the country’s energy security.

The complex will produce 1 million tonnes of ethylene a year and refine 10 million metric tonnes of oil a year, boosting refining capacity at Dushanzi to 16 million tonnes a year.

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Production has started in the refinery, which will process high-sulphur crude oil from Kazakhstan, reports Bloomberg.

The Dushanzi project is expected to generate more than ¥60bn per year, according to the company.