Taxes (Tables)

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Effective Tax Rate Reconciliation

The consolidated income tax provision differs from the amount computed by applying the statutory federal income tax rate to income before income taxes, as follows:

	MGE Energy		MGE
Three Months Ended March 31,	2019	2018	2019	2018
Statutory federal income tax rate	21.0 %	21.0 %	21.0 %	21.0 %
State income taxes, net of federal benefit	6.3 %	6.4 %	6.2 %	6.0 %
Amortized investment tax credits	(0.1)%	(0.1)%	(0.1)%	(0.1)%
Credit for electricity from wind energy(a)	(5.9)%	(0.5)%	(6.5)%	(0.5)%
AFUDC equity, net	(0.2)%	(0.4)%	(0.2)%	(0.4)%
Amortization of utility excess deferred tax - tax reform(b)	(2.4)%	(1.8)%	(2.6)%	(2.0)%
Other, net, individually insignificant	0.5 %	(0.4)%	0.5 %	(0.6)%
Effective income tax rate	19.2 %	24.2 %	18.3 %	23.4 %

(a)Saratoga Wind Farm became operational in February 2019.

(b)Included are impacts of the Tax Cuts and Jobs Act for the regulated utility for excess deferred taxes recognized using a normalization method of accounting.For the three months ended March 31, 2019 and 2018, MGE recognized $0.6 million and $0.5 million, respectively. The amount and timing of the cash impacts will depend on the period over which certain income tax benefits are provided to customers, determined by the PSCW.