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Variable Interest Entities (Tables)

12 Months Ended

Dec. 31, 2017

Variable Interest Entity [Line Items]

Variable interest entities significant balance sheet accounts

At December 31, MGE has included the following significant accounts on its consolidated balance sheets related to its interest in this VIE:

(In thousands)		2017		2016
Property, plant, and equipment, net	$	176,002	$	175,502
Construction work in progress		1,225		3,241
Deferred income taxes^(a)		29,256		42,525
Long-term debt		59,416		62,021
Noncontrolling interest^(a)		97,635		80,362

(a) In 2017, there was a $14.8 million one-time tax impact as a result of the Tax Act for MGE Power Elm Road. See Footnote 12 for further information.

MGE Power West Campus [Member]

Variable Interest Entity [Line Items]

Variable interest entities significant balance sheet accounts

At December 31, MGE has included the following significant accounts on its consolidated balance sheets related to its interest in this VIE:

(In thousands)		2017		2016
Property, plant, and equipment, net	$	80,282	$	81,588
Affiliate receivables		4,236		4,769
Deferred income taxes^(b)		13,795		19,912
Long-term debt		43,262		44,932
Noncontrolling interest^(b)		43,267		35,303

(b) In 2017, there was a $6.8 million one-time tax impact as a result of the Tax Act for MGE Power West Campus. See Footnote 12 for further information.

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

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