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Investor Presentaiton

L 58 Appendix 58 NorthWestern Energy Profile Authorized Jurisdiction and Service Montana electric delivery and production (1) Montana - Colstrip Unit 4 Implementation Date April 2019 Rate Base Estimated Rate Base Authorized Overall Rate Authorized Return on (millions) (millions) of Return Equity Authorized Equity Level 2,030.1 2,500.9 6.92% 9.65% 49.38% April 2019 304.0 272.4 8.25% 10.00% 50.00% Montana natural gas delivery and production (2) September 2017 430.2 516.1 6.96% 9.55% 46.79% Total Montana South Dakota electric (3) South Dakota natural gas (3) Total South Dakota Nebraska natural gas (3) Total NorthWestern Energy 2,764.3 3,289.4 December 2015 557.3 626.8 7.24% n/a n/a December 2011 65.9 77.4 7.80% n/a n/a 623.2 704.2 December 2007 24.3 3,411.8 37.8 4,031.4 8.49% 10.40% n/a (1) The revenue requirement associated with the FERC regulated portion of Montana electric transmission and ancillary services are included as revenue credits to our MPSC jurisdictional customers. Therefore, we do not separately reflect FERC authorized rate base or authorized returns. (2) The Montana gas revenue requirement includes a step down which approximates annual depletion of our natural gas production assets included in rate base. (3) For those items marked as "n/a," the respective settlement and/or order was not specific as to these terms. Note: Data as reported in our 2020 10-K We anticipate current capital investment projections to result in annualized rate base growth of 4%-5% NorthWestern Energy Delivering a Bright Future
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