The final size of the tranche will not be determined until the deal reaches financial close. It could result in some reduction in the size of the $1.5bn commercial bank tranche, and the equally-sized loan from Japanese export credit agency JBIC.

Financial close on the deal is expected on 30 July, following delays of about a week because of difficulties arranging a signing schedule suitable for all the parties involved.

Twenty banks are participating on the deal, in a take-and-hold basis, meaning they will provide the funding themselves rather than syndicating it out to other banks.