Aug 6 (Reuters) - The Canada Energy Regulator (CER) on

Tuesday said the Trans Mountain final interim tolls oral hearing

related to its pipeline expansion is scheduled to start on May

14 with final argument to take place in the summer of 2025.

Trans Mountain pipeline expansion (TMX) entered partial

operation in May, years behind schedule and at more than four

times the original cost.

TMX has had to raise tolls to recoup some costs. The

shippers are disputing the rate increase.

In April, the CER approved a request from shippers to

disclose additional detailed cost and expense information.

"The Commission adjusted the timeline proposed by the

parties, due to the increased volume and complexity of records

that must be assessed during this proceeding," the regulator

said in a statement.