The firm will be the design company for the newly completed South Hook terminal, providing engineering support.
Its scope of work includes engineering conceptual design, detailed design, procurement, construction, commissioning and project management services.
The company will be working in collaboration with Black and Veatch, which will provide specialist LNG knowledge.
Neil Bruce, chief operating officer of Natural Resources and Power & Process division said: “This is a significant award for AMEC and gives us the opportunity to build on our existing LNG experience while delivering reliability, efficiency and excellence for our client.”