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Investor Presentaiton

L In early February, 2019, NorthWestern 1000 experienced a 800 nearly five day span* when the wind didn't blow and the sun was scant. We were forced to rely upon an already strained market and transmission system for a significant amount of our required capacity (shown in red hatch). Megawatts 600 We had an average need of 327 MW and 544 MW peak need when the market prices were also peaking. * 6am on Feb. 3rd - 10pm on Feb. 7th 600 400 200 Appendix 35 A Recent Example Load, Generation and Deficit During February 2019 Total Hydro Total Natural Gas Total Solar ■Total Thermal ■Total Wind Deficit Load 1200 1000 800 600 400 200 0 0 1st 5th 10th 15th 20th 25th 28th
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