Taxes

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Taxes

Taxes - MGE Energy and MGE.

Effective Tax Rate.

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.