Compounding Long-term Dividends at 5-7% CAGR

3 Other RNG Advancements OWGL ■ 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

View entire presentation