A Calgary-based energy company is scheduled to go to court this summer to answer to charges laid in connection with a pair of pipeline spills in 2017.

It was one of the largest spills in Alberta's history. Now, Nexen has pleaded guilty to a charge under the Environmental Protection and Enhancement Act for the July 2015 oil spill.

Officials are responding to a pipeline spill of approximately 100,000 litres - or 100 cubic metres - of emulsion near Chateh, Alberta.

Following the news that a Nexen pipeline has spilled roughly 5,000 cubic metres of emulsion, you might be wondering what emulsion is exactly.