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Suncor Energy , Canada’s second-largest oil producer, and Shell Canada Ltd, a subsidiary of Royal Dutch Shell wrote to the National Energy Board on Friday opposing Enbridge’s plans.

They join MEG Energy and the Explorers and Producers Association of Canada (EPAC) in a growing chorus of dissent against Enbridge’s proposal to introduce long-term fixed-volume contracts on North America’s largest pipeline system.

The 2.85-million-barrel-per-day Mainline carries the bulk of Canadian crude exports to the United States, and currently allocates capacity on a monthly basis. It is a crucial conduit for producers at a time when pipeline capacity is so constrained the Alberta government last week extended mandatory production curtailments.

Enbridge launched a two-month open season to solicit bids from shippers for contracted space on 90% of the Mainline’s capacity.

Suncor and Shell asked the NEB, which will ultimately approve or reject Enbridge’s application, to review the terms on offer before the open season closes on Oct. 2.

“Suncor continues to believe that the terms and conditions of the open season are not fair, just or reasonable,” the company said in a lawyers’ letter.

Canadian shippers fear U.S. refiners like BP Plc and ExxonMobil Corp will snap up the bulk of Mainline capacity. They are also concerned the contracts will tie them into delivering crude to the Midwest region, limiting their ability to reach more liquid markets like the U.S. Gulf Coast.

Shell said congestion on Canadian export pipelines meant Enbridge was effectively forcing shippers to sign up for unfair tolls on long-term committed capacity or risk being left without market access.

“Shell is concerned that the open season and the offering may represent an abuse of market power,” Shell Canada president Michael Crothers said in the letter.

Enbridge has not publicly disclosed the terms on offer.

Guy Jarvis, Enbridge’s executive vice president of liquids pipelines, said it was premature to ask the NEB to intervene before Oct. 2. The company will submit an application with finalized terms and tolls once the open season ends.

“It seems it is getting the cart before the horse because the results of the open season will inform our application,” Jarvis told Reuters.

The NEB did not immediately respond to a request for comment.