Add Crippling Pipe Work to Canada Gas Woes Amid U.S. Surge

Canadian natural gas producers are losing more ground to U.S. competitors as an acute shortage of pipeline space forces them to cap output.

Producers have been shutting in supplies this year over a capacity squeeze poised to last another few months on TransCanada Corp.’s NGTL system in Alberta, as the pipeline company undertakes inspections and repairs ordered by regulators.