Segment Information (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Results from Operations by Reportable Segment

(Thousands of Dollars)	Regulated Electric		Regulated Natural Gas		All Other		Reconciling Eliminations			Consolidated Total
Three Months Ended March 31, 2016
Operating revenues (a)(b)	$	211,524	$	43,020	$	306	$	—		$	254,850
Intersegment revenues	109		80		—		(189		)	—
Total revenues	$	211,633	$	43,100	$	306	$	(189	)	$	254,850
Net income	$	11,501	$	6,092	$	38	$	—		$	17,631

(Thousands of Dollars)	Regulated Electric			Regulated Natural Gas		All Other			Reconciling Eliminations			Consolidated Total
Three Months Ended March 31, 2015
Operating revenues (a)	$	210,284		$	63,296	$	380		$	—		$	273,960
Intersegment revenues	109			225		—			(334		)	—
Total revenues	$	210,393		$	63,521	$	380		$	(334	)	$	273,960
Net income (loss)	$	15,514	(b)	$	6,781	$	(28	)	$	—		$	22,267

^(a)  Operating revenues include $41 million and $38 million of affiliate electric revenue for the three months ended March 31, 2016 and 2015, respectively.

^(b)  Includes a net of tax charge related to the Monticello LCM/EPU project.  See Note 5.