Globally Connected Infrastructure

3 Energy Efficiency Priorities Marked Investments in Energy Efficiency Over Past Decade; Desire to Play Much Larger Role Energy efficiency represents more than 40% of the emissions abatement needed by 2040, according to the IEA Sustainable Development Scenario. WGL and SEMCO Continue to Execute Large Approved Energy Efficiency Plans Saved ~490 Thousand Tons GHG 1,2 Equivalent to ~61,200 Homes² Reduction since 2011 equivalent to ~61,200 homes energy use for one year through programs Since 2011 Numerous programs for financial support and decarbonization opportunities Residential • • • • Low-Income Assistance Programs Weatherization Assistance Programs Home Energy Audit Space and Process Heating Tune-Up • Strategic Energy Management Appliance and Equipment Rebates . Behavior Programs • Energy Star New Homes $250 $200 $150 $100 $50 WGL and SEMCO Cumulative Spending on Energy Efficiency Programs (2011-2023 YTD) SEMCO and WGL have spent > $250MM on energy efficiency programs since 2011 2011 2012 2013 2014 2015 2016 VA 2017 ■MD 2018 ■MI 2019 2020 2021 2022 2023YTD • • Energy Conservation Kits Residential Weatherization Projects . Gas Heat Pumps Hybrid Systems Net Zero Buildings Industrial • Boiler Energy Management System • Commercial • Combined Heat and Power • Microgrids • Demand Response Management Combined Heat and Power • Gas Heat Pump • Hybrid Heat Pump Notes: 1) Conversion from therms using EPA "Greenhouse Gas Equivalencies Calculator"; 2) Based on first year energy savings. *See "Forward-looking Information" AltaGas Strong Desire and Focus to Deploy More Capital and Resources into Energy Efficiency Opportunities 42

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