23

MDU RESOURCES G ROUP, INC.

new customers*

minot, north dakota

Tim Kretschmar, Glenn Houston, Shane Branson and

Ryan Conklin of Montana-Dakota Utilities Co. work on a

·

project that involves installing a high-efficiency natural gas

heating system in 90 flight line buildings at Minot Air Force

Base in North Dakota.

toppenish,

washington

Darrel Wheeler, Jon

Mulvenon, Dave Delp,

Conrad Castro and

Conrad Castro Jr.

of Cascade Natural

Electric and natural gas distribution area

·

Electric generating stations

Gas Corp. work at the

site of a pipeline

Montana-Dakota Utilities Co. generates, transmits and distributes

installation project to

electricity and distributes natural gas in Montana, North Dakota, South

serve an expansion of

Dakota and Wyoming. Cascade Natural Gas Corp. distributes natural

The Legends Casino.

gas in Oregon and Washington. Great Plains Natural Gas Co. distributes

natural gas in western Minnesota and southeastern North Dakota. These

operations also supply related value-added products and services.

source of earnings

·  56% Electric

baker, montana

Diamond Willow is

·  44% Natural Gas Distribution

Montana-Dakota Utilities

Co.'s first wind farm.

The wind project --

13 towers with total

generating capacity of

19.5 megawatts -- is

owned and operated by

Montana-Dakota.

*Including customers of Cascade Natural Gas Corp., which was acquired in July 2007.