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Highly Carbon-Free Supply Portfolio 2020 Electric Generation Portfolio - Montana Wind Contracted 23.0% 69% Carbon-Free 2020 Electric Generation Portfolio - Total NWE Wind Owned 3.0% Contracted CELP & YELP 11.7% MT Hydro Owned 40.6% Wind Contracted 23.0% Wind Owned 6.6% Natural Gas Contracted 0.9% Natural Gas /- Other Owned 2.8% Coal Owned 15.6% Hydro Contracted Solar 1.8% Contracted <1% Contracted energy from Colstrip Energy Limited Partners (CELP), Yellowstone Energy Limited Partners (YELP) as well as a majority of the contracted wind, hydro and solar are federally mandated Qualifying Facilities, as defined under the Public Utility Regulatory Policies Act of 1978 (PURPA). 2020 Electric Generation Portfolio - South Dakota Wind Owned 23.3% Natural Gas / Other Owned 2.1% 47% Carbon-Free DODDD Contracted CELP & YELP 9.7% Natural Gas Contracted 0.8% Natural Gas / Other Owned 2.7% DOOOO Coal Owned 21.9% Coal Owned 51.1% SD Wind Contracted 23.5% NWE 7 65% Carbon-Free - Hydro Owned 33.5% Hydro Contracted Solar 1.5% Contracted <1% Based upon 2020 MWH's of owned and long-term contracted resources. Approximately 65% of our total company owned and contracted supply is carbon-free. NorthWestern does not own all the renewable energy certificates (RECs) generated by contracted wind, and periodically sells its own RECS with proceeds benefiting retail customers. Accordingly, we cannot represent that 100% of carbon-free energy in the portfolio was delivered to our customers. NorthWestern Energy Delivering a Bright Future

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