This article was originally published on The Conversation.
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The world’s biggest pipeline, the controversial Keystone XL, has leaked in southern Ontario, according to an Environmental Protection Agency (EPA) report.
The spill occurred on Tuesday in the town of Leduc, north of Edmonton, and is now under investigation by the province’s Department of Energy.
According to the EPA, it is not yet known how many barrels of oil spilled from the pipeline during the incident.
It is also unclear how much oil was released by the leak.
Keystone XL, which was originally designed to transport crude from the Bakken oil fields in North Dakota to Gulf Coast refineries, has been delayed by the spill, which is the largest ever in the United States.
Last month, a pipeline rupture in the Gulf of Mexico killed five workers.
A spokesperson for the company said the rupture was “likely related to the pipeline being closed for maintenance”.
The Keystone XL has been under construction since 2008, but has yet to be completed.
This is not the first time Keystone XL leaked in Alberta.
In 2013, a leak from a separate pipeline caused the closure of the oil export terminal at Edmonton International Airport, which has been the heart of the province since 1984.
In 2012, a spill from the Keystone pipeline spilled 6,000 barrels of crude into a creek near the town, causing $1 million in damages.
Oil companies are now expected to spend more than $1.6 billion on the Keystone Pipeline, which will transport 1.7 million barrels of Canadian crude per day from the Canadian oil sands to refineries in the US.