Investor Presentaiton

Successful track record of delivering EBITDA¹ growth over time Significant growth in 2018 driven by WGL Acquisition $ Millions 1,000 800 600 400 200 HI 0 2010 2011 2012 2013 2014 2015 2016 2017 2018F Non-commodity % of EBITDA¹ 25% - 30% growth² 2010 50% 2011 43% 2012 70% 2013 2014 2015 2016 2017 69% 79% 93% 98% 92% 2018F2 -90% AltaGas 1 Represents normalized EBITDA 2 Expectations as at August 1, 2018 2010 in accordance with CGAAP. 2011 and forward in accordance with U.S. GAAP See "forward-looking information" 22 22

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