Investor Presentaiton

J Community $2.3 Billion Economic Output in 2020 ($2.013B in Montana & Customers Typical Residential Bills Lower than National Average ESG - Social Employees Safety Culture Transformation 27 Over $5 million Donations, $249M in SD/NE) CIRCLE ANALYTICS "Typical Bill" Residential Rate Comparison Lost Time Incident Rate 3.0 SPI National Average ($105.05) 2.5 National Average ($95.70) $100 Sponsorships, Economic 2.0 Development, Scholarship SD 580 MT 90.84 97.72 $60 MT 76.05 1.0 SD 60.84 NE 63.13 0.5 $40 1.5 Funding, Public Recreation Support, Safety Awareness and Volunteer Program Grants in 2020 411 Number of nonprofits that received grants through Employee Volunteer Program $9.4 Million Low-Income Energy Assistance in 2020 Low-Income Assistance We work closely with the federal Low Income Energy Assistance programs to provide critical short- term aid to our community's most vulnerable citizens SXI 7.0 $ Electric (750 kwh) Natural Gas (100 therms) Building on Our Best - Improved Customer Satisfaction Scores 6.0 5.0 4.0 3.0 NWE's Overall Customer Satisfaction Scores 2.0 via JD Power Electric & Gas Residential Studies 1.0 740 720 700 680 660 640 620 600 580 560 JD Power Scores 1.20 1.00 1.10 '07 '08 '09 10 11 12 13 14 15 16 17 18 19 20 OSHA Recordable Rate LD 6.20 3.70 3.00 2.60 2.81 2.68 2.23 1.88 1.78 ECT 1.87 '07 '08 '09 '10 11 12 13 14 15 16 17 18 19 "20 Diverse Employment $5.96M in MT $2.19M in SD $1.28M in NE 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Electric Natural Gas Over the last 13 years, our energy efficiency programs have helped customers save 685,041 MWh's of energy - enough to power 76,000 homes for a year. Represented 2015 2020 Females as % of 22% 26% Total Management 42% NorthWestern Energy Delivering a Bright Future Employees as % of 41% Total Employees

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