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Segment Information (Tables)
3 Months Ended
Mar. 31, 2015
Segment Reporting [Abstract]  
Results by Reportable Segment
(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

(Thousands of Dollars)
 
Regulated Electric
 
Regulated Natural Gas
 
All Other
 
Reconciling Eliminations
 
Consolidated Total
Three Months Ended March 31, 2014
 
 
 
 
 
 
 
 
 
 
Operating revenues (a)
 
$
211,097

 
$
73,791

 
$
254

 
$

 
$
285,142

Intersegment revenues
 
92

 
2,917

 

 
(3,009
)
 

Total revenues
 
$
211,189

 
$
76,708

 
$
254

 
$
(3,009
)
 
$
285,142

Net income
 
$
15,066

 
$
7,709

 
$
1,460

 
$

 
$
24,235

(a) 
Operating revenues include $38 million and $31 million of affiliate electric revenue for the three months ended March 31, 2015 and 2014, respectively.
(b) 
Includes a net of tax charge related to the Monticello LCM/EPU project.  See Note 5.