9

MDU RESOURCES G ROUP, INC.

businesses in 2007 totaled $174.0 million, with the pipeline and

energy services operations reporting record results for the year

and the natural gas and oil business' earnings down slightly from

the 2006 record. Strong development and exploration activity and

pipeline expansion support continued growth.

$145.7$142.5

$141.6

19%

$110.8

$63.0

$30.0 $31.5

$22.1

$18.2

$8.9

07

07

03

04

05

06

03

05

06

04

five-year earnings growth*

natural gas and

pipeline and

oil production earnings

energy services earnings

(millions)

(millions)

corporate earnings contribution**

44% Natural Gas and Oil Production

10%

10% Pipeline and Energy Services

44%

* Compound annual growth rate; before discontinued operations

** Based on consolidated earnings before discontinued operations