AltaGas Value Proposition

2 Advance System Expansion and Reliability Projects Advance pragmatic extension to service territory to bring natural gas to currently unserved customers A and progress long-term projects focused on improving system reliability B for the long-term. Washington Gas 10% of homes within the states we operate use propane, fuel oil, kerosene or other fuels other than natural gas or electricity for home heating. Frederick MARYLAND DISTRICT OF COLUMBIA Frederick WEST VIRGINIA Montgomery Clarke Loudoun Michigan 12.9% Warren Shenandoah Arlington Fairfax Prince George's VIRGINIA Prince William Charles Maryland 12.2% La Plata Charles County Expansion Virginia 9.5% St. Mary's SEMCO BA Keweenaw Pipeline ONTARIO Manistique to Newberry Connector BAY WISCONSIN MICHIGAN Thumb of Michigan Area Expansion Detroit BA Several service area extension opportunities being evaluated to extend mainline and bring gas to under/non-serviced communities. >220 miles of distribution line extension being considered to ensure long-term reliability for both served and unserved customers. Notes: *See "Forward-looking Information" AltaGas Extension and Reinforcement Opportunities Augment Ongoing System Modernization 39

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