July-September, 2006

• MDU Resources Acquires California-Based Asphalt Oil Terminal
• MDU Resources Announces Webcast of Energy/Power Conference Presentation
• MDU Resources Increases Common Stock Dividend 6.55 Percent
  
• MDU Resources CEO and Chairman White Retires
  
• MDU Resources Names Pearce Chairman of the Board
• MDU Resources Names Hildestad President, CEO and Director
  
• MDU Resources Director Nance Retires
  
• MDU Resources purchases share of transmission line business in Brazil
  
• MDU Resources Reports Second Quarter 2006 Consolidated Earnings, Increases 2006 Earnings Guidance
• MDU Resources to Acquire Cascade Natural Gas
• MDU Resources Announces Webcast of Second Quarter 2006 Earnings Conference Call