TransCanada Corp. (TRP) will have to spend $1 billion more than planned on an oil pipeline to Canada’s Atlantic Coast if natural gas customers get their way, a move it says would threaten the viability of the project. TransCanada has delayed seeking regulatory approval of the C$12 billion ($10.7 billion) Energy East line as it negotiates with Quebec’s Gaz Metro Inc. and Ontario units of Spectra Energy Corp. (SE) and Enbridge Inc. (ENB) , said two people familiar with the talks who asked not to be identified discussing a private matter. The spat centers on TransCanada’s plan to convert a 3,000-kilometer (1,865-mile) stretch of its mainline gas conduit to carry oil. The nation’s largest pipeline operator after Enbridge is pursuing Energy East as environmental opposition imperils other planned lines from Canada ’s oil sands to tidewater, including its Keystone XL. Gas distributors claim that converting […]