02:45 PM EDT, 04/24/2024 (MT Newswires) -- Suncor Energy ( SU ) has raised doubts over the commencement date of the long-delayed Trans Mountain expansion project in a letter to the Canada Energy Regulator Tuesday.

The company, on behalf of itself and oil shippers BP (BP), Marathon Petroleum ( MPC ) and Parkland Refining, said it was concerned the project may not begin on May 1 and that the firms would be required to pay tolls starting from that date.

"While it is possible that Trans Mountain might be able to complete the physical construction of Expansion facilities by May 1, 2024, there appears to be a real likelihood that those facilities will not be capable of providing Firm Service at that time," the letter said.

The shippers said they were not seeking any relief from the Canada Energy Regulator at this point.

Trans Mountain did not immediately respond to a request for comment from MT Newswires.

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