IEPL began as Eleme Petrochemicals Company Limited (EPCL), a 100% subsidiary of the Nigerian National Petroleum Corporation (NNPC). In August 2006, under the Nigerian Government's Privatization Program, Indorama Corporation became the core investor, transforming EPCL into a thriving public-private enterprise.

Indorama complex in Eleme, near Port Harcourt, Rivers State, Nigeria, was constructed in 1995, by a consortium of world’s leading Engineering and Technology giants comprising of Chiyoda, JGC & Kobe Steel of Japan, Tecnimont of Italy and Spie Batignolles of France.

IEPL operates state-of-art Olefins, Polyethylene (PE), Butene - 1 and Polypropylene (PP) Plants. Olefins, licensed by Kellogg Brown & Root (KBR), USA, uses Natural Gas Liquid (NGL) as the feedstock and is designed to produce 340 KTA of Ethylene & 100 KTA of Propylene.

PE, licensed by Nova Chemicals, Canada and PP licensed by Lyondell Basell, Italy are designed to produce 340 KTA of PE and 100 KTA of PP respectively. Additionally, Butene 1 Plant, licensed by IFP-Axens, France is designed to produce 22 KTA. Butene-1 is consumed internally in PE plants to control the density of PE resins.

IEPL is supported by a fully equipped HSEF (Health, Safety, Environment & Fire) department, staffed with experienced professionals dedicated to assisting and guiding all operational functions. To support the plant maintenance, a full-fledged engineering and maintenance department including central and satellite workshops are in operation.

Fully equipped central and satellite QAQC laboratories are functional to ensure the quality of feedstock, raw materials, catalysts & chemicals, intermediates and finished products.