FADHILI, Saudi Arabia, July 20 (Reuters) - State oil giant Saudi Aramco IPO-ARMO.SE signed four engineering contracts to build its Fadhili gas processing project, the company announced at a press conference on Wednesday.

The contracts, with firms including Saudi Electricity Co 5110.SE and France's Engie ENGIE.PA , are expected to permit completion of the 50 billion riyal ($13.3 billion) project by the end of 2019, the company said. Other contracts for the project were signed late last year.

The plan for Fadhili includes a 1,500-megawatt power plant. The project is to boost Saudi gas production capacity to more than 17 billion standard cubic feet by 2020.

(Reporting by Reem Shamseddine, Writing by Katie Paul,; Editing by Andrew Torchia) ((Katie.Paul@thomsonreuters.com;))