The unit has come on stream with a total annual production capacity of 750,000 tons and an investment of €866 million.
Speaking to Shana, the plant’s CEO, Hassan Najafi-Semnani, said construction of the plant began on 2003 with 4 process units of SRU, olefin, heavy polyethylene and ancillary services with the aim of completing the value chain, removing poverty in the region and generation of jobs. 
He stated that the heavy polyethylene unit and ancillary services of Ilam Petrochemical Plant officially came online in 2014, adding: "By inauguration of the olefin unit, the feedstock of the heavy polyethylene unit, which has been received from the West Ethylene Pipeline, will be supplied from this unit."
The CEO of Ilam Petrochemical Company further added that the SRU of the facility was developed with €56m of investment and has been built to sweeten the olefin feedstock, adding: “The sweetened feedstock will be transferred to the olefin unit for production of ethylene, propylene, pyrolysis gasoline and liquid fuel.”
Najafi-Semnani said the SRU is fed by 349,000 tons of C3+ fraction and heavier sulfur fractions and 416,000 tons of C5+ fraction and heavier sulfur fractions, and continued the annual production capacity of this unit is 331,000 tons of desulfurized of C3+ fraction and heavier and 401,000 tons of C5+ fraction and heavier.
He said that the share of domestic construction in the SRU is an average of 72.5 percent, including engineering, construction, installation and manufacturing of equipment. 
The unit is licensed by Axens and built by Iran’s Energy Industries Engineering and Design (EIED).
Furthermore, the olefin unit is fed by 233,000 tons of ethane, 328,000 tons of C3+ and heavier fractions and 391,000 tons of C5+ and heavier fractions per year. The unit is designed to yield 458,000 tons of ethylene, 124,000 tons of propylene, 132,000 tons of pyrolysis gasoline and 33,000 tons of liquid fuel annually.
Najafi-Semnani went on to add that the unit is financed by €810 million, adding the total value of the unit's annual production is $439 million and the surplus sales value is $235 million. 305,000 tons of ethylene produced by olefin unit is consumed in heavy polyethylene unit and sale of the surplus ethylene is 153,000 tons.
He continued that 70% of construction of the olefin unit, including engineering, building, installation and equipment manufacture, was completed domestically, adding this unit was licensed by UK’s Stone&Webster Limited. 
The two units generate 1,700 jobs during its installation, and 250 direct and 870 indirect jobs while operating. 
Iranian Investment Petrochemical Group Company (IIPGC), a subsidiary of the Persian Gulf Petrochemical Industries Company (PGPIC) is the main stockholder of Ilam Petrochemical Company.