Saudis Advanced Petrochemical Company acquired a stake in the scheme in September
Kuwaits investment is the second foreign direct investment in the PDH project, which is being developed by SK Gas, which is part of the South Korean SK Group.
PIC will be joining by acquiring a 25 per cent equity stake in the project.
SK Gas will now hold a 45 per cent stake in the project, 30 per cent will be held by Saudi-based Advanced Global Investment Company (AGIC), which is a subsidiary of APC.
Mechanical completion of the project was announced in October 2015 and the trial production of the PDH Plant is expected to start during the first quarter of 2016.
The plant is slated to produce 600,000 tonnes of propylene a year.
APC announced PICs investment in the project in a statement released via the Saudi Stock Exchange on 19 January 2016.