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Short-Term and Long-Term Debt Short-Term and Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2015
Short-Term and Long-Term Debt [Abstract]  
Expected First Mortgage Bonds Issuance [Table Text Block]
On September 24, 2015, we issued $100.0 million of ALLETE first mortgage bonds (Bonds) in the private placement market as shown below:
Maturity Date
Principal Amount
Interest Rate
September 15, 2020
$40 Million
2.80%
September 16, 2030
$60 Million
3.86%