More large companies are signing deals to secure renewable power supplies to help them reduce their carbon footprints.
Some 84 Megawatts of capacity at the wind farm will be used to power Ineos' existing production sites in Belgium and the new ethane cracker site it is building in Antwerp.
"This... will reduce our carbon footprint in Belgium by more than one million tonnes of CO2, the equivalent of taking 100,000 cars off the road each year," Gerd Franken, chairman of Ineos Olefins & Polymers Europe said in a statement.
Ineos said it would also seek other options to expand renewable energy use at its operations.
No financial details of the deal were disclosed.
(This story corrects headline to say Belgian, not Dutch; fixes syntax in lead)
(Reporting by Susanna Twidale; Editing by Louise Heavens and David Goodman)