XML 105 R37.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2019
Related Party Transactions [Abstract]  
Related Party Transactions
Accounts receivable and payable with affiliates at Dec. 31 were:
 
 
2019
 
2018
(Millions of Dollars)
 
Accounts
Receivable
 
Accounts
Payable
 
Accounts
Receivable
 
Accounts
Payable
NSP-Minnesota
 
$
—

 
$
7.9

 
$
—

 
$
11.0

PSCo
 
0.3

 
—

 
0.2

 
—

Other subsidiaries of Xcel Energy Inc.
 
—

 
11.1

 
14.9

 
9.0

 
 
$
0.3

 
$
19.0

 
$
15.1

 
$
20.0


Significant affiliate transactions among the companies and related parties including billings under the Interchange Agreement for the years ended Dec. 31:
(Millions of Dollars)
 
2019
 
2018
 
2017
Operating revenues:
 
 
 
 
 
 
Electric
 
$
176.6

 
$
157.9

 
$
177.2

Operating expenses:
 
 
 
 
 
 
Purchased power
 
393.9

 
410.9

 
421.6

Transmission expense
 
63.5

 
62.8

 
68.6

Natural gas purchased for resale
 
0.5

 
—

 
—

Other operating expenses — paid to Xcel Energy Services Inc.
 
86.8

 
86.9

 
92.7