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Segment Information (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2016
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
202,879

 
$
16,005

 
$
289

 
$
—

 
$
219,173

Intersegment revenues
 
98

 
122

 
—

 
(220
)
 
—

Total revenues
 
$
202,977

 
$
16,127

 
$
289

 
$
(220
)
 
$
219,173

Net income (loss)
 
$
15,098

 
$
(2,465
)
 
$
(8
)
 
$
—

 
$
12,625

 
 
 
 
 
 
 
 
 
 
 
(Thousands of Dollars)
 
Regulated Electric
 
Regulated Natural Gas
 
All Other
 
Reconciling Eliminations
 
Consolidated Total
Three Months Ended June 30, 2015
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
199,621

 
$
16,889

 
$
303

 
$
—

 
$
216,813

Intersegment revenues
 
98

 
73

 
—

 
(171
)
 
—

Total revenues
 
$
199,719

 
$
16,962

 
$
303

 
$
(171
)
 
$
216,813

Net income (loss)
 
$
13,787

 
$
(1,074
)
 
$
(201
)
 
$
—

 
$
12,512

(a) 
Operating revenues include $43 million and $33 million of affiliate electric revenue for the three months ended June 30, 2016 and 2015, respectively.

 
 
 
 
 
 
 
 
 
 
 
(Thousands of Dollars)
 
Regulated
Electric
 
Regulated
Natural Gas
 
All Other
 
Reconciling
Eliminations
 
Consolidated
Total
Six Months Ended June 30, 2016
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
414,403

 
$
59,025

 
$
595

 
$
—

 
$
474,023

Intersegment revenues
 
207

 
202

 
—

 
(409
)
 
—

Total revenues
 
$
414,610

 
$
59,227

 
$
595

 
$
(409
)
 
$
474,023

Net income
 
$
26,599

 
$
3,627

 
$
30

 
$
—

 
$
30,256


 
 
 
 
 
 
 
 
 
 
 
(Thousands of Dollars)
 
Regulated
Electric
 
Regulated
Natural Gas
 
All Other
 
Reconciling
Eliminations
 
Consolidated
Total
Six Months Ended June 30, 2015
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
409,905

 
$
80,185

 
$
683

 
$
—

 
$
490,773

Intersegment revenues
 
207

 
298

 
—

 
(505
)
 
—

Total revenues
 
$
410,112

 
$
80,483

 
$
683

 
$
(505
)
 
$
490,773

Net income (loss)
 
$
29,301

(b) 
$
5,707

 
$
(229
)
 
$
—

 
$
34,779

(a) 
Operating revenues include $84 million and $78 million of affiliate electric revenue for the six months ended June 30, 2016 and 2015, respectively.
(b) 
Includes a net of tax charge related to the Monticello LCM/EPU project.  See Note 5.