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Regulatory Matters - Minnesota Solar Energy Standard (Details) - MPUC [Member] - MW
Dec. 31, 2018
Oct. 02, 2018
Regulatory Matters [Line Items]    
Minnesota Solar Energy Standard - Overall Mandate Percentage 1.50%  
Minnesota Solar Energy Standard - Camp Ripley Project [Member] | Minnesota Power [Member]    
Regulatory Matters [Line Items]    
Generating Capacity Owned (MW) 10  
Minnesota Solar Energy Standard - Community Solar Garden Project - Purchased Output [Member] | Minnesota Power [Member]    
Regulatory Matters [Line Items]    
Generating Capacity Counterparty Owned (MW) 1  
Minnesota Solar Energy Standard - Community Solar Garden Project - Owned and Operated [Member] | Minnesota Power [Member]    
Regulatory Matters [Line Items]    
Generating Capacity Owned (MW) 0.04  
Minnesota Solar Energy Standard - Blanchard Solar Energy Facility [Member] | Minnesota Power [Member]    
Regulatory Matters [Line Items]    
Generating Capacity Counterparty Owned (MW)   10
Minimum [Member]    
Regulatory Matters [Line Items]    
Minnesota Solar Energy Standard - Overall Mandate Percentage 1.50%  
Minnesota Solar Energy Standard - Small Scale Solar Mandate Percentage 10.00%  
Maximum [Member]    
Regulatory Matters [Line Items]    
Minnesota Solar Energy Standard - Qualifying Capacity for Small Scale Solar Mandate (MW) 0.04