AltaGas Value Proposition

3 Strengthening the AltaGas Value Chain The Multifaceted Approach to Strengthening the Franchise Gas Gathering & Processing AltaGas Midstream NGL Extraction, Fractionation & Liquids Handling Transportation, Storage and Logistics Global Exports Medium-to- longer-term Growth Potential4 Pipestone I, Pipestone II, REEF, and Dimsdale 2.1 Bcf/d1 Processing 65,000 Bbl/d²; 6 Facilities 210 MMcf/d Processing Pipestone I/II sour deepcut processing in Alberta Montney ~15,000 Bbls/d+ C2+ volumes with ~6,500 Bbls/d of LPGs from Pipestone I/II 2-3%/year 2024-2028 ~4,700 rail cars, >6 MMBbl Storage ~150,000 Bbl/d³ Export capability + Up to 2-4%/year 15 Bcf/d Gas Storage Dimsdale storage asset ensures producer egress and provides other AltaGas value creation options 50,000+ Bbls/d Export Capacity ~6,500 11,500 Bbls/d Pipestone C3/C4 supply 2025-2028 Incremental Organic Growth Opportunities ■ Gas Processing Optimizations and Expansion ☐ Pipestone III Rolling Hills CCUS Townsend De-propanizer / De-butanizer North Pine Expansion C2+ Extraction Opportunities Dimsdale Expansion Pacific Northwest Hydrogen Hub REEF Future Expansion Phases (bulk liquids, C2 Exports) Notes: 1) Based on ALA working interest capacity in FG&P and extraction, based on nameplate capacity. 2) Based on ALA 100% working interest facilities and ALA % capacity in non-operated facilities, based on nameplate capacity 3) Includes RIPET and Ferndale. 4) Represents growth in the Midstream segment normalized EBITDA. *See "Forward-looking Information" AltaGas Building Blocks to Become Preeminent Midstream Platform in Western Canada + Up to 1-6%/year Longer-term 56

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