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Related Party Transactions
12 Months Ended
Dec. 31, 2018
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 PSCo. The services are provided and billed to each subsidiary in accordance with service agreements executed by each subsidiary. PSCo uses services 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. See Note 5 for further information.
Significant affiliate transactions among the companies and related parties for the years ended Dec. 31:
(Millions of Dollars)
 
2018
 
2017
 
2016
Operating revenues:
 
 
 
 
 
 
Electric
 
$

 
$
1.4

 
$
8.8

Other
 
4.4

 
4.5

 
4.5

Operating expenses:
 
 
 
 
 
 
Other operating expenses — paid to Xcel Energy Services Inc.
 
518.7

 
485.1

 
446.1

Interest expense
 

 

 
0.1

Accounts receivable and payable with affiliates at Dec. 31:
 
 
2018
 
2017
(Millions of Dollars)
 
Accounts
Receivable
 
Accounts
Payable
 
Accounts
Receivable
 
Accounts
Payable
NSP-Minnesota
 
$
17.9

 
$

 
$
7.7

 
$

NSP-Wisconsin
 

 
0.2

 

 

SPS
 
0.7

 

 
0.3

 

Other subsidiaries of Xcel Energy Inc.
 
62.2

 
45.8

 
6.7

 
58.7

 
 
$
80.8

 
$
46.0

 
$
14.7

 
$
58.7