Investor Presentaiton

Midstream Operations in North America's Most Prolific Gas Plays Strategic infrastructure provides producers with global market access ☐ " ■ Unique opportunity providing critical infrastructure for energy exports at three sites on both the Pacific and Atlantic Only significant existing West Coast energy export terminal (Ferndale)1 with a second (RIPET) under construction, moving natural gas liquids to key markets including Asia High grade asset base in sustainable plays drive growth Strategic footprint in vertically integrated Montney & Marcellus / Utica plays 114 Montney expected to grow from -4.5 Bcf/d in 2016 to 8 Bcf/d by 20402 Gas Processing Regional LNG Facility LPG Export Terminal LPG Export Terminal Under Construction Storage Facility Storage Facility Under Construction Midstream Pipelines Midstream Pipelines Under Development AltaGas Appalachia production expected to grow from ~24 Bcf/d in 2017 to well over 30 Bcf/d³ 20-year GAIL Supply Agreement at Cove Point (Cove Point shipped first export cargo in March 20184) 1 AltaGas has 1/3 interest in Ferndale facility. 2 NEB - Energy Market Assessment. 3 U.S. Energy Information Administration. 4 Source: Desjardins Capital Markets, Natural Gas Report, March 8, 2018 Expectations as at August 1, 2018 See "forward-looking information" 8

View entire presentation