Investor Presentaiton

Energy Storage Pomona Energy Storage • • . 10 year Energy Storage Agreement (ESA) with Southern California Edison (SCE) for 20 MW energy storage at Pomona facility Resource adequacy capacity for four hour period, equivalent of 80 MWh of energy discharging capacity Commercial operations date: December 31, 2016 Other Battery Storage Opportunities • • • California's three largest utilities were mandated to procure 1,325 MW by 2020 • ~400 MWs are left to be procured by 2020 SCE, PG&E, and SDG&E to explore up to a combined 500 MW of additional distributed energy storage SCE to procure another 20 MW and LADWP to study 100 MW of cost effective energy storage resulting from Aliso Canyon Gas Storage integrity Additional 'Preferred Resources' RFPs are expected in 2018 that will include energy storage AltaGas will continue to leverage its existing sites and infrastructure as well as look for greenfield development opportunities Renewable Integration & Flexibility • California legislators continue to move towards reducing fossil fuel reliance which creates new energy storage procurement opportunities • CPUC is including energy storage in their resource planning to aid the integration of renewables Net load will need to be met by a combination of flexible resources, imports/exports, and curtailments AltaGas FONTAINE DON A AltaGas As at August 1, 2018 See "forward-looking information" 52 42

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