Contractors have broken ground on the world’s largest air separation unit, which is being built at the Jazan refinery site to process fuels for an integrated IGCC power plant – also a world-beater.

The Jazan Gas Projects Company (JGPC) joint venture of Saudi private power developer Acwa Power and US industrial gases firm Air Products has broken ground for construction of a $2.1bn air separation unit – the world’s largest – which is a key component of an...