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Equity Investments
12 Months Ended
Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]  
Equity Investments [Text Block] EQUITY INVESTMENTS
Investment in ATC. Our wholly-owned subsidiary, ALLETE Transmission Holdings, owns approximately 8 percent of ATC, a Wisconsin-based utility that owns and maintains electric transmission assets in portions of Wisconsin, Michigan, Minnesota and Illinois. We account for our investment in ATC under the equity method of accounting. For the year ended December 31, 2020 we invested $2.7 million in ATC. We expect to invest approximately $2.0 million in 2021.
ALLETE’s Investment in ATC  
Year Ended December 3120202019
Millions  
Equity Investment Beginning Balance$141.6 $128.1 
Cash Investments2.7 6.6 
Equity in ATC Earnings22.3 21.7 
Distributed ATC Earnings(18.9)(16.1)
Amortization of the Remeasurement of Deferred Income Taxes1.3 1.3 
Equity Investment Ending Balance$149.0 $141.6 

ATC Summarized Financial Data  
Balance Sheet Data  
As of December 3120202019
Millions  
Current Assets$92.8 $84.6 
Non-Current Assets5,400.5 5,244.3 
Total Assets$5,493.3 $5,328.9 
Current Liabilities$310.8 $502.6 
Long-Term Debt2,512.2 2,312.8 
Other Non-Current Liabilities378.2 298.9 
Members’ Equity2,292.1 2,214.6 
Total Liabilities and Members’ Equity$5,493.3 $5,328.9 

Income Statement Data   
Year Ended December 31202020192018
Millions   
Revenue$758.1 $744.4 $690.5 
Operating Expense372.4 373.5 358.7 
Other Expense110.9 110.5 108.3 
Net Income$274.8 $260.4 $223.5 
ALLETE’s Equity in Net Income$22.3 $21.7 $17.5 

ATC’s authorized return on equity is 10.02 percent, or 10.52 percent including an incentive adder for participation in a regional transmission organization, based on a May 21, 2020, FERC order that granted rehearing of a November 2019 FERC order. (See Note 4. Regulatory Matters.)
NOTE 5. EQUITY INVESTMENTS (Continued)

Investment in Nobles 2. Our subsidiary, ALLETE South Wind, owns a 49 percent equity interest in Nobles 2, the entity that owns and operates the 250 MW wind energy facility in southwestern Minnesota pursuant to a 20-year PPA with Minnesota Power. Construction of the wind energy facility was completed and tax equity funding of $116.3 million, net of issuance costs, was received in the fourth quarter of 2020. We account for our investment in Nobles 2 under the equity method of accounting. As of December 31, 2020, our equity investment in Nobles 2 was $152.2 million ($56.0 million at December 31, 2019). For the year ended December 31, 2020, we invested $96.4 million and results from operations were immaterial.