Saudi-based Rabigh Refining and Petrochemical Co (PetroRabigh) is looking for firms interested to start work on the second phase of its giant petrochemicals complex, industry sources said.

PetroRabigh, a joint venture between state oil giant Saudi Aramco and Sumitomo Chemical inaugurated the first phase of their complex in November. It can produce an annual 18 million tonnes of refined products and 2.4 million tonnes of petrochemicals.

Long-term growth in petrochemical demand in China has encouraged Aramco and Sumitomo to consider moving forward with the estimated SR25 billion ($6.67 billion) expansion.

PetroRabigh is looking at producing about 17 new products, from the expansion, the company’s chief executive, Ziad Labban, told Reuters in November.

“They have just issued the solicitation of interest, there are seven (construction) packages...Contractors are requested to respond by the end of this month,” said one source.

Each package consists of several process units, one contractor said.

Japan’s JGC Corporation is currently conducting a feasibility study on phase II which is due to be completed by the third quarter of this year.

A final investment decision on the project will be taken once the study is completed and reviewed.