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The AER assesses each pipeline incident and assigns a consequence rating, which indicate the effect an incident may have on the public, land, environment and wildlife.

High consequence pipeline incidents are those that could have significant effect on the public, wildlife, or livestock or that involve the release of a substance that affects flowing water.

Incidents may also be rated as medium or low consequence. A description of these ratings can be found on our Pipeline Performance page.


Pipeline incidents in Alberta continue to decline, with the number of incidents decreasing by 12 per cent in 2020 compared to 2019. Overall, the number of pipeline incidents has dropped by 40 per cent over the past 10 years, despite the total length of pipelines having grown by 11 per cent.

In 2020, high consequence pipeline incidents represented five percent of all pipeline incidents that occurred. The number of pipeline incidents that were rated as high consequence dropped by 20 per cent, decreasing to 16 incidents in 2020 from 20 incidents in 2019.

The pipeline failure rate for high consequence incidents in 2020 was 0.04 per 1000 kilometres of pipeline.

Related information

For detailed data on pipeline incidents that occurred between 2015 and 2019, visit our Pipeline Performance page.