AltaGas Value Proposition

2 Accelerated Replacement Programs The Foundation for Improved Safety and Reliability with Better Outcomes for All Stakeholders Over US$1.7 billion of System Reinforcement Projects over next 5 years APRP Maturity (Year) Washington Gas A WGL Company SEMCOENERGY GAS COMPANY Maryland D.C. Virginia Michigan Notes: US$1.7 billion in programs include approved and filed AltaGas 2023 2024 2025 US$330MM 1,2 US$115MM 2026 2027 2028 New STRIDE 3 Plan US$330MM 5-yr commencing 20241 Requested US$672MM 1,2 New PROJECTpipes 3 Plan US$672MM 5-yr commencing 20251,2,3 US$878MM Extension to be filed in 20264 Extension to be filed in 20244 US$768MM remaining on 5-yr SAVE Plan, commenced in 2023 US$54MM remaining on 5-yr Mains Replacements, commenced in 2021 Rolling Approved Modernization Programs Follow the Large Replacement Backlog Across the Network 37

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