Nova Scotia's Premier fears a proposed pipeline to ship liquid natural gas from near Saint John directly to the U.S. border could scuttle proposals for natural gas projects in his province.

In a recent interview, Rodney MacDonald noted Emera Inc.'s 145-kilometre Brunswick pipeline poses challenges for his government.

Mr. MacDonald said the pipeline -- known as a "bullet" because it bypasses other lines -- could affect tolls charged on the 558-kilometre Maritimes and Northeast pipeline between Nova Scotia and the United States.

"These are all issues that could potentially mean the difference between having a project in Nova Scotia or not having a project," he said.

The two projects currently being considered for liquefied natural gas terminals in Nova Scotia include one proposed by Anadarko Petroleum Corp. for Bear Head on the Canso causeway, and a second by 4Gas Ltd. in Goldboro.

The two Nova Scotian projects have been in a race with a project at the Irving Oil-owned Canaport LNG facility, where giant tankers are expected to deliver the cooled gas from Spanish-owned Repsol YPF SA starting in 2009.

However, the Irving-Repsol project is further along, and is making its proposal before the National Energy Board this fall.

Mr. MacDonald did not go into further detail on why he has concerns, but experts from several Nova Scotia provincial departments describe the Brunswick pipeline as giving the Irving-Repsol project strong cost advantages over the toll prices the Nova Scotia projects would pay.

They say if the Emera pipeline had instead hooked up to the Maritimes and Northeast system, it would have increased volume in the system -- and lowered costs for all users. Both would have to hook up to the end of the Maritimes and Northeast pipeline, which charges a rate based on a region-wide average -- known as a "postage stamp" system.

Meanwhile, the much shorter Brunswick Pipeline would charge based on distance, and is calling for its prices to be secret.

Energy expert Ian Doig, editor of a leading oil and gas industry newsletter, notes competing projects in Nova Scotia are already facing challenges.

Anadarko's bid to create a terminal at Bear Head has been in limbo since it announced it planned to sell the project to U.S. Venture Energy, a private equity firm.

"It doesn't seem reasonable for any buyer to enter a Bear Head purchase until it sees how the NEB deals with the Brunswick matter and how this will affect tolling on the Maritimes and Northeast system," Mr. Doig said.

Despite the challenges to the Nova Scotia projects, provincial officials say they won't be opposing Emera's bid. They fear that might kill the Irving-Repsol project and affect a needed source of natural gas for the region.

The mixed emotions are reflected by the Premier's answers on where the province stands. "Again, because of the concerns, I wouldn't say I'm pro the project, but I'm not adamantly opposed," Mr. MacDonald said.

Peter Milne, a consultant for Anadarko, has filed highly critical evidence before the energy board, arguing the pipeline should have run north to join with the Canadian portion of the Maritimes and Northeast system. He argues that would have reduced rates for all potential users of the line by tens of millions of dollars annually.

However, Steve Rankin, a spokesman for both the Emera and Maritimes and Northeast pipelines, said the reality is that there will be a market for both Irving-Repsol gas and the Nova Scotian projects.

He also said the Brunswick pipeline provides new natural gas supply to the U.S. portion of the Maritimes and Northeast pipeline, and that increased volume will slightly reduce overall toll costs for all users.

Mr. Rankin said that Emera chose the route straight to the United States because it is cheaper and runs parallel to power transmission lines being built by New Brunswick Power Corp. "The project is more economic, and you don't have to do additional reinforcement on the main line," he said.

Maritimes and Northeast is majority-owned by Duke Energy, and Emera has a 12.9-per-cent interest in the project.