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Segment Information
6 Months Ended
Jun. 30, 2012
Segment Information [Abstract]  
Segment Information
10.   Segment Information
 
Operating results from the regulated electric utility and regulated natural gas utility are each separately and regularly reviewed by NSP-Wisconsin's chief operating decision maker.  NSP-Wisconsin evaluates performance based on profit or loss generated from the product or service provided.  These segments are managed separately because the revenue streams are dependent upon regulated rate recovery, which is separately determined for each reportable segment.

NSP-Wisconsin has the following reportable segments: regulated electric, regulated natural gas and all other.

NSP-Wisconsin's regulated electric utility segment generates electricity which is transmitted and distributed in Wisconsin and Michigan.  In addition, this segment includes sales for resale and provides wholesale transmission service to various entities primarily in Wisconsin.
NSP-Wisconsin's regulated natural gas utility segment purchases, transports, stores and distributes natural gas in portions of Wisconsin and Michigan.
Revenues from operating segments not included above are below the necessary quantitative thresholds and are therefore included in the all other category.  Those primarily include investments in rental housing projects that qualify for low-income housing tax credits.

Asset and capital expenditure information is not provided for NSP-Wisconsin's reportable segments because as an integrated electric and natural gas utility, NSP-Wisconsin operates significant assets that are not dedicated to a specific business segment, and reporting assets and capital expenditures by business segment would require arbitrary and potentially misleading allocations which may not necessarily reflect the assets that would be required for the operation of the business segments on a stand-alone basis.

To report income from continuing operations for regulated electric and regulated natural gas utility segments, the majority of costs are directly assigned to each segment.  However, some costs, such as common depreciation, common operating and maintenance (O&M) expenses and interest expense are allocated based on cost causation allocators.  A general allocator is used for certain general and administrative expenses, including office supplies, rent, property insurance and general advertising.
 
   
Regulated
  
Regulated
  
All
  
Reconciling
  
Consolidated
 
(Thousands of Dollars)
 
Electric
  
Natural Gas
  
Other
  
Eliminations
  
Total
 
Three Months Ended June 30, 2012
 
 
  
 
  
 
  
 
  
 
 
Operating revenues from external customers
 $179,105  $14,830  $238  $-  $194,173 
Intersegment revenues
  109   61   -   (170)  - 
Total revenues
 $179,214  $14,891  $238  $(170) $194,173 
Net income (loss)
 $6,127  $(947) $562  $-  $5,742 
                      
Three Months Ended June 30, 2011
                    
Operating revenues from external customers
 $178,692  $19,880  $278  $-  $198,850 
Intersegment revenues
  116   276   -   (392)  - 
Total revenues
 $178,808  $20,156  $278  $(392) $198,850 
Net income (loss)
 $9,139  $(618) $(43) $-  $8,478 

   
Regulated
  
Regulated
  
All
  
Reconciling
  
Consolidated
 
(Thousands of Dollars)
 
Electric
  
Natural Gas
  
Other
  
Eliminations
  
Total
 
Six Months Ended June 30, 2012
 
 
  
 
  
 
  
 
  
 
 
Operating revenues from external customers
 $361,106  $56,322  $544  $-  $417,972 
Intersegment revenues
  196   264   -   (460)  - 
Total revenues
 $361,302  $56,586  $544  $(460) $417,972 
Net income
 $17,375  $2,453  $792  $-  $20,620 
                      
Six Months Ended June 30, 2011
                    
Operating revenues from external customers
 $363,060  $73,363  $535  $-  $436,958 
Intersegment revenues
  216   838   -   (1,054)  - 
Total revenues
 $363,276  $74,201  $535  $(1,054) $436,958 
Net income
 $19,520  $3,592  $9  $-  $23,121