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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment and Estimated Useful Lives of Property, Plant and Equipment [Table Text Block]

Property, Plant and Equipment
As of December 31			2021						2020
Millions
Regulated Operations
Property, Plant and Equipment in Service			$5,028.7						$4,972.3
Construction Work in Progress			108.7						79.4
Accumulated Depreciation			(1,834.6)						(1,758.0)
Regulated Operations – Net			3,302.8						3,293.7
ALLETE Clean Energy
Property, Plant and Equipment in Service			1,716.9						1,275.4
Construction Work in Progress			79.9						261.0
Accumulated Depreciation			(149.0)						(112.9)
ALLETE Clean Energy – Net			1,647.8						1,423.5
Corporate and Other (a)
Property, Plant and Equipment in Service			267.1						240.5
Construction Work in Progress			19.8						9.6
Accumulated Depreciation			(137.3)						(126.5)
Corporate and Other – Net			149.6						123.6
Property, Plant and Equipment – Net			$5,100.2						$4,840.8

(a)Primarily includes BNI Energy and a small amount of non-rate base generation.

Estimated Useful Lives of Property, Plant and Equipment (Years)

Regulated Operations

Generation

2 to 50

ALLETE Clean Energy

5 to 35

Transmission

50 to 75

Corporate and Other

3 to 50

Distribution

18 to 70

Asset Retirement Obligations [Table Text Block]

Asset Retirement Obligations
Millions
Obligation as of December 31, 2019						$160.3
Accretion						8.3
Liabilities Recognized						1.4
Liabilities Settled						(3.6)
Revisions in Estimated Cash Flows						0.2
Obligation as of December 31, 2020						166.6
Accretion						8.8
Liabilities Recognized						4.5
Liabilities Settled						(5.2)
Revisions in Estimated Cash Flows						9.8
Obligation as of December 31, 2021						$184.5

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- Definition

Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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- Definition

Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859

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