Investor Presentaiton

Western Canadian Rocky Mountain NM Permian Bakken/ Williston SD TX ND MN NE KS Northern Natural Gas Mid-Continent OK Granite Wash Wolfberry Shale WI IL MI • • • • • • Headquartered in Omaha, Nebraska 900 employees 14,500-mile interstate natural gas transmission pipeline system 6.3 Bcf per day of market area design capacity; 1.7 Bcf per day field area capacity to demarcation and 1.4 Bcf per day of Permian area capacity More than 79 Bcf of firm service and operational storage cycle capacity 95% of transportation and storage revenue through September 30, 2021, is contracted based on fixed amounts (demand charges) that are not dependent on the volumes transported Market Area transportation contracts have a weighted average contract term of six years Storage contracts have a weighted average contract term of five years Increased the integrity and reliability of the pipeline Ranked No. 1 among 16 mega-pipelines and No. 2 among 32 interstate pipelines in 2021 Mastio & Company customer satisfaction survey February 2021 Polar Vortex Severe cold weather experienced February 13-16 in the region, impacting natural gas prices Northern experienced eight days of over 5.0 Bcf in Market Area deliveries in February, which was a record for the system for a single month Physical pipeline operations performed exceptionally well throughout the severe weather event Compression assets and storage facilities maintained 100% reliability 60

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