Subsequent events

9 Months Ended

Sep. 30, 2015

Subsequent Event [Line Items]

Subsequent event [Text Block]

Subsequent events

On October 1, 2015, MDU Energy Capital entered into a note purchase agreement and issued $50.0 million of Senior Notes with a due date of October 1, 2030, at an interest rate of 4.31 percent.

On October 29, 2015, the Company entered into a $150.0 million note purchase agreement and issued $98.0 million of Senior Notes with due dates ranging from October 30, 2025 to October 30, 2045, at a weighted average interest rate of 3.90 percent. The remaining $52.0 million of Senior Notes will be issued on December 10, 2015, with a due date of December 10, 2030, at an interest rate of 4.03 percent.