Olefins 11 will comprise an ethane cracker with capacity of 1.2 million tonnes a year (t/y), a high-density polyethylene (HDPE) plant with capacity of 300,000 t/y, a linear low-density polyethylene (LLDPE) plant with capacity of 300,000 t/y, a styrene monomer plant with capacity of 600,000 t/y and a monoethylene glycol (MEG) plant with capacity of 700,000 t/y. There are also discussions about the addition of a further train to the project.

Olefins 12 will run in parallel to olefins 11. It will comprise a 1.9 million-t/y ethane cracker, an HDPE/LLDPE swing plant of 300,000 t/y, a 660,000-t/y MEG plant, a 300,000-t/y polypropylene plant and a 388,000-t/y benzene unit. The complexes will run on liquid feedstock consisting of South Pars carbon associated gases. The engineering, procurement and construction (EPC) contracts will be tendered by NPC project management subsidiary Petrochemical Industries Development Management Company (Pidmco).

The olefins 11 and 12 complexes are the last planned for development under the fourth five-year development plan, now in its final year. NPC is working on its next development plan, expected to comprise petrochemical complexes along the route of the planned ethylene pipeline running from Assaluyeh and Bandar Imam up the western side of the country. There are proposals for complexes at Khoramabad, Kermanshah, Urumiyah and Samandaj-Kurdistan (MEED 26:9:03).