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Ms. Johnston is a Corporate Director. She was Executive Vice President, Gas, Renewables, and Operations Services at TransAlta Corporation from 2015 until her retirement in 2017. Between 2011 and 2015, she held various positions at TransAlta, including Executive Vice President Enterprise Risk and Corporate Services and Executive Vice President Corporate Services. From 2013 until her retirement, she was Chief Operating Officer and served as a non-independent Director of TransAlta Renewables. Prior thereto, Ms. Johnston held various executive leadership positions with TransAlta and FortisAlberta. She is currently a director of AltaGas Ltd.