June 26 (Reuters) - U.S. energy firm Sempra ( SRE ) has

agreed to a non-binding supply agreement with Saudi Aramco

for 5 million tonnes per annum of liquefied natural

gas from the Port Arthur LNG Phase 2 expansion project for 20

years, the companies said.

The agreement contemplates Aramco's 25% participation in the

project-level equity of Phase 2, the companies said on

Wednesday.

In March, Reuters reported that Aramco was in talks to

invest in the Port Arthur project in Texas.