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MDU Electric Generation Overview MISO ensures the reliable delivery of electricity at the lowest cost across high-voltage power lines in 15 U.S. states and the Canadian province of Manitoba. Over the past eight years MDU has purchased 25 percent, on average, of its energy from the MISO market at an average price of 2.5¢/KwH. Winter peak: 117,903 MW Summer peak: 130,917 MW Generation capacity: 191,062 MW MISO Overview 2009 2011 2013 2015 2017 MISO Area of service MISO Energy Mix 2009-2017 Coal 73% Gas 5% Wind/Hydro 5% Nuclear 15% Other 3% Coal 73% Gas 7% Wind/Hydro 7% Nuclear 13% Other 1% Coal 66% Gas 12% Wind/Hydro 8% Nuclear 13% Other 1% Coal 51% Gas 24% Wind/Hydro 8% Nuclear 16% Other 1% Coal 41% Gas 35% Wind/Hydro 13% Nuclear 8% Other 4% MDU SUMMER PEAK 611.5 MW Winter Peak 582.1 MW Heskett 3 - Mandan, ND 88 MW Glendive 2 - Glendive, MT 40 MW Glendive 1 - Glendive, MT 34 MW Miles City - Miles City, MT 23 MW Lewis & Clark 2 - Sidney, MT 19MW Total 800 MW Thunder Spirit Wind 1 & 2 - Hettinger, ND 155.5 MW Diamond Willow Wind - Baker, MT 30 MW Cedar Hills Wind - Rhame, ND 19.5 MW Glen Ullin Waste Heat (from pipeline compressor)– Glen Ullin, ND 5.3 MW Other Portable Diesel Generation Two units – each 2 mw 48% | 386 MW 25% | 204 MW 27% | 210 MW Coal-fired generation Natural gas-fired generation Renewable generation Heskett 1&2 - Mandan, ND 25 MW unit 1 (1954) / 75 MW unit 2 (1963) Lewis & Clark Station - Sidney, MT 44 MW (1958) Coyote Station - Beulah, ND 107 MW of 427 MW plant (1981) Big Stone Station - Big Stone City, SD 108 MW of 475 MW plant (1975) WyGen III - Gillett, WY (Non-Miso) 27 MW of 110 MW (2010)

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MDU Electric Generation Overview

MISO ensures the reliable delivery of electricity at the lowest cost across high-voltage power lines in 15 U.S. states and the Canadian province of Manitoba. Over the past eight years MDU has purchased 25 percent, on average, of its energy from the MISO market at an average price of 2.5¢/KwH.

Winter peak:117,903 MW

Summer peak:130,917 MW

Generation capacity:191,062 MW

MISO Overview

2009 2011 2013 2015 2017

MISO Area of service

MISO Energy Mix 2009-2017

Coal 73%Gas 5%Wind/Hydro 5%Nuclear 15%Other 3%

Coal 73%Gas 7%Wind/Hydro 7%Nuclear 13%Other 1%

Coal 66%Gas 12%Wind/Hydro 8%Nuclear 13%Other 1%

Coal 51%Gas 24%Wind/Hydro 8%Nuclear 16%Other 1%

Coal 41%Gas 35%Wind/Hydro 13%Nuclear 8%Other 4%

MDU SUMMER PEAK 611.5 MW Winter Peak 582.1 MW

Heskett 3 - Mandan, ND 88 MW

Glendive 2 - Glendive, MT 40 MW

Glendive 1 - Glendive, MT 34 MW

Miles City - Miles City, MT 23 MW

Lewis & Clark 2 - Sidney, MT 19MW

Total 800 MW

Thunder Spirit Wind 1 & 2 - Hettinger, ND 155.5 MW

Diamond Willow Wind - Baker, MT 30 MW

Cedar Hills Wind - Rhame, ND 19.5 MW

Glen Ullin Waste Heat (from pipeline compressor)– Glen Ullin, ND 5.3 MW

OtherPortable Diesel Generation Two units – each 2 mw

48% | 386 MW 25% | 204 MW 27% | 210 MWCoal-fired generation Natural gas-fired generation Renewable generation

Heskett 1&2 - Mandan, ND 25 MW unit 1 (1954) / 75 MW unit 2 (1963)

Lewis & Clark Station - Sidney, MT 44 MW (1958)

Coyote Station - Beulah, ND 107 MW of 427 MW plant (1981)

Big Stone Station - Big Stone City, SD 108 MW of 475 MW plant (1975)

WyGen III - Gillett, WY (Non-Miso) 27 MW of 110 MW (2010)