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Related Party Transactions
12 Months Ended
Dec. 31, 2013
Related Party Transactions [Abstract]  
Related Party Transactions
Related Party Transactions

Xcel Energy Services Inc. provides management, administrative and other services for the subsidiaries of Xcel Energy Inc., including SPS. The services are provided and billed to each subsidiary in accordance with service agreements executed by each subsidiary. SPS uses the service provided by Xcel Energy Services Inc. whenever possible. Costs are charged directly to the subsidiary and are allocated if they cannot be directly assigned.

Xcel Energy Inc., NSP-Minnesota, PSCo and SPS have established a utility money pool arrangement with the utility subsidiaries. See Note 4 for further discussion of this borrowing arrangement.

The table below contains significant affiliate transactions among the companies and related parties for the years ended Dec. 31:
(Thousands of Dollars)
 
2013
 
2012
 
2011
Operating revenues:
 
 
 
 
 
 
Electric
 
$
1,331

 
$
6,539

 
$
7,187

Operating expenses:
 
 
 
 
 
 
Purchased power
 
8,136

 
9,271

 
10,896

Other operating expenses — paid to Xcel Energy Services Inc.
 
127,669

 
117,277

 
118,370

Interest expense
 
178

 
76

 
83

Interest income
 

 
10

 
1


Accounts receivable and payable with affiliates at Dec. 31 were:
 
 
2013
 
2012
(Thousands of Dollars)
 
Accounts
Receivable
 
Accounts
Payable
 
Accounts
Receivable
 
Accounts
Payable
NSP-Minnesota
 
$
3,462

 
$

 
$
3,820

 
$

NSP-Wisconsin
 

 
26

 
4

 

PSCo
 

 
1,056

 

 
69

Other subsidiaries of Xcel Energy Inc.
 
12,378

 
14,305

 
967

 
12,294

 
 
$
15,840

 
$
15,387

 
$
4,791

 
$
12,363