Investor Presentaiton

Base Business Continues to Deliver Solid Financial Results Q2 2018 Achieved normalized EBITDA¹ of $166 million and normalized funds from operations¹ of $121 million Asset monetization strategy significantly progresses with sale of 35% indirect equity interest in the Northwest Hydro Facilities for $922 million ■ Further asset sales expected through Q3 2018 Integration activities well underway after closing of WGL acquisition Central Penn Pipeline expected to be in service in Q3 2018; RIPET and Mountain Valley Pipeline expected on-line in Q1 2019 2018 Outlook 25% - 30% EBITDA¹ growth 15% - 20% FFO1 growth AltaGas 1 Non-GAAP financial measure See "forward-looking statements & information" 102 21

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