The federal regulator said the TransCanada pipe broke Tuesday morning about 10 kilometres north of Rocky Mountain House.
It said the pipe was shut down and there were no immediate public safety concerns.
Manager of the Rocky Gas Co-op, Vic Kelly, advised customers to use other fuel sources until the gas is turned back on.
There was no word on when that might happen.
A TransCanada pipeline explosion in Manitoba last month left about 3,600 homes and businesses without heat for several days in -20 C temperatures.
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