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Segment Information (Tables)
6 Months Ended
Jun. 30, 2014
Segment Reporting [Abstract]  
Results by Reportable Segment
(Thousands of Dollars)
 
Regulated Electric
 
Regulated Natural Gas
 
All Other
 
Reconciling Eliminations
 
Consolidated Total
Three Months Ended June 30, 2014
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)(b)
 
$
761,569

 
$
223,187

 
$
8,948

 
$

 
$
993,704

Intersegment revenues
 
62

 
49

 

 
(111
)
 

Total revenues
 
$
761,631

 
$
223,236

 
$
8,948

 
$
(111
)
 
$
993,704

Net income
 
$
75,741

 
$
10,846

 
$
3,205

 
$

 
$
89,792


(Thousands of Dollars)
 
Regulated Electric
 
Regulated Natural Gas
 
All Other
 
Reconciling Eliminations
 
Consolidated Total
Three Months Ended June 30, 2013
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)(b)
 
$
747,882

 
$
209,296

 
$
9,251

 
$

 
$
966,429

Intersegment revenues
 
61

 
25

 

 
(86
)
 

Total revenues
 
$
747,943

 
$
209,321

 
$
9,251

 
$
(86
)
 
$
966,429

Net income
 
$
85,603

 
$
8,786

 
$
2,910

 
$

 
$
97,299

(a)    Operating revenues include $3 million and $2 million of affiliate electric revenue for the three months ended June 30, 2014 and 2013, respectively.
(b)    Operating revenues include $1 million of other affiliate revenue for the three months ended June 30, 2014 and 2013.
(Thousands of Dollars)
 
Regulated Electric
 
Regulated Natural Gas
 
All Other
 
Reconciling Eliminations
 
Consolidated Total
Six Months Ended June 30, 2014
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)(b)
 
$
1,495,833

 
$
679,524

 
$
21,890

 
$

 
$
2,197,247

Intersegment revenues
 
159

 
108

 

 
(267
)
 

Total revenues
 
$
1,495,992

 
$
679,632

 
$
21,890

 
$
(267
)
 
$
2,197,247

Net income
 
$
149,709

 
$
48,995

 
$
9,491

 
$

 
$
208,195

(Thousands of Dollars)
 
Regulated Electric
 
Regulated Natural Gas
 
All Other
 
Reconciling Eliminations
 
Consolidated Total
Six Months Ended June 30, 2013
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)(b)
 
$
1,469,230

 
$
593,220

 
$
21,436

 
$

 
$
2,083,886

Intersegment revenues
 
149

 
72

 

 
(221
)
 

Total revenues
 
$
1,469,379

 
$
593,292

 
$
21,436

 
$
(221
)
 
$
2,083,886

Net income
 
$
164,071

 
$
42,585

 
$
7,248

 
$

 
$
213,904

(a)    Operating revenues include $5 million and $4 million of affiliate electric revenue for the six months ended June 30, 2014 and 2013, respectively.
(b)    Operating revenues include $2 million of other affiliate revenue for the six months ended June 30, 2014 and 2013.