AltaGas Value Proposition

3 Other RNG Advancements WGL ■ WGL is advancing several RNG opportunities across ■ the DMV Currently, five to ten in-territory facilities are being evaluated WGL's focus is in-territory projects and interconnects, representing up to 4 bcf of annual supply potential Consistent with WGLS decarbonization plan, the Company anticipates acquiring 10-15 Bcf RNG from outside its service territory Projects will progress WGL towards 10% lower- carbon fuel goal ■ ◉ SEMCOENERGY Pursuing various RNG interconnect opportunities within Michigan Opportunities are focused on in-territory dairy farms and landfills Five potential projects are currently being evaluated with developers Discussions are in various stages, focused on understanding timing and costs ■ Several other RNG expansion opportunities are in the pipeline Total capex potential across all projects is upwards of $275-550MM¹. AltaGas' focus will be on rate base or "rate base-like" investments across the RNG value chain. Notes: *See "Forward-looking Information"; 1) Actual capital investment will vary based on construction costs and our role within the project RNG value chain. AltaGas WGL and SEMCO Continue to Advance Opportunities Across Service Territories 41

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