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GENERAL INFORMATION - INVESTMENTS (Details)	Sep. 30, 2018	Aug. 31, 2018
ATC
Schedule of Investments [Line Items]
Equity method investment, ownership interest (as a percent)	60.00%
Bishop Hill III Holdings LLC
Schedule of Investments [Line Items]
Bishop Hill III Holdings LLC's interest in Bishop Hill III Wind Energy Center	100.00%
WEC's ownership interest in Bishop Hill III Wind Energy Center		80.00%

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Bishop Hill III Holdings LLC's interest in Bishop Hill III Wind Energy Center

+ References

No definition available.

+ Details

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- Definition

WEC's ownership interest in Bishop Hill III Wind Energy Center

+ References

No definition available.

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