China National Petroleum Corp. will invest in a northeastern port city hit by an oil spill last year at the firm's facilities, averting paying direct compensation to local fishermen, state media said.

The state-owned oil giant has agreed to build plants in
Dalian with annual refining capacity of 20 million tons and ethylene production of one million tons, the Economic and National Weekly said on its website Monday.

In return, the city government will pay compensation to the fishing industry for damage and losses caused by the July 2010 slick, the report said, citing unnamed sources involved in the negotiations between authorities and CNPC.

Dalian , a coastal city in Liaoning province, hit headlines last year after two pipelines exploded at an oil storage depot belonging to CNPC, triggering a spectacular blaze that burned for days.

The government estimated that about 1,500 tons of oil poured into the Yellow Sea but Greenpeace said 60,000-90,000 tons of crude, or up to 60 times more than official estimates, may have escaped into the area.

The environmental group said the economic impact on the local tourism and fishing industry would be "significant," estimating the fishing industry would lose $50-100 million this year alone.

The report didn't disclose financial details of the investment or compensation, but said the new plants would boost CNPC's refining capacity in the city to 50.5 million tons from 30.5 million tons.

An investigation by the government found that a desulphurizing chemical was mistakenly pumped into pipelines after a tanker had stopped unloading crude, triggering the explosion.

Liao Yongyuan, a deputy general manager of CNPC, blamed contractors for the accident, according to a company statement in August.