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Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Commercial Paper
Commercial paper outstanding for NSP-Wisconsin was as follows:
 
 
Three Months Ended Dec. 31, 2018
 
Year Ended
(Amounts in Millions, Except Interest Rates)
 
 
2018
 
2017
 
2016
Borrowing limit
 
$
150

 
$
150

 
$
150

 
$
150

Amount outstanding at period end
 
51

 
51

 
11

 
60

Average amount outstanding
 
51

 
28

 
52

 
15

Maximum amount outstanding
 
103

 
103

 
129

 
64

Weighted average interest rate, computed on a daily basis
 
2.56
%
 
2.31
%
 
1.23
%
 
0.69
%
Weighted average interest rate at period end
 
2.89

 
2.89

 
1.73

 
0.95

Schedule of Debt To Total Capitalization Ratio
Debt-to-Total Capitalization Ratio(a)
 
Amount Facility May Be Increased (millions)
 
Additional Periods For Which a One-Year Extension May Be Requested (b)
2018
 
2017
 
 
 
 
48
%
 
47
%
 
N/A
 
1

Credit Facilities
Dec. 31, 2018 (in millions):
Credit Facility (a)
 
Drawn (b)
 
Available
$
150

 
$
51

 
$
99

(a) 
This credit facility matures in June 2021.
(b) 
Includes outstanding commercial paper.
other short term debt [Table Text Block]
The following table presents the notes payable of Clearwater Investments, Inc., a NSP-Wisconsin subsidiary, to Xcel Energy Inc.:
(Amounts in Millions, Except Interest Rates)
 
Dec. 31, 2018
 
Dec. 31, 2017
Notes payable to affiliates
 
$
0.6

 
$
0.5

Weighted average interest rate
 
2.89
%
 
1.73
%
Schedule of Capitalization
(Millions of Dollars)
 
Maturity Range
 
Interest Rate Range 2018
 
Interest Rate Range 2017
 
2018
 
2017
Mortgage bonds
 
2024-2048
 
3.3% - 6.38%

 
3.3% - 6.38%

 
$
800

 
$
750

City of La Crosse resource recovery bond
 
2021
 
6.00
%
 
6.00
%
 
19

 
19

Other
 
 
 
 
 
 
 

 
2

Unamortized discount
 
 
 
 
 
 
 
(3
)
 
(3
)
Unamortized debt issuance cost
 
 
 
 
 
 
 
(9
)
 
(7
)
Current maturities
 
 
 
 
 
 
 

 
(151
)
Total
 
 
 
 
 
 
 
$
807

 
$
610

Schedule of Maturities of Long-term Debt
Maturities of long-term debt:
(Millions of Dollars)
 
 
2019
 
$

2020
 

2021
 
19

2022
 

2023
 

Schedule of Long-Term Debt Issuances
2018 financings:
Amount
 
Financing Instrument
 
Interest Rate
 
Maturity Date
200 million
 
First mortgage bonds
 
4.20
%
 
Sept. 1, 2048
2017 financings:
Amount
 
Financing Instrument
 
Interest Rate
 
Maturity Date
100 million
 
First mortgage bonds
 
3.75
%
 
Dec. 1, 2047
Dividend Payment Restrictions
Equity to Total
Capitalization Ratio
Required Range
 
Equity to Total Capitalization Ratio Actual
Low
 
High
 
2018
51.5
%
 
N/A
 
51.8
%
Unrestricted Retained Earnings
 
Total Capitalization
 
Limit on Total Capitalization
$
11.5
 million
 
$
1.7
 billion
 
N/A
(a) NSP-Wisconsin cannot pay annual dividends in excess of approximately $55 million if its average equity-to-total capitalization ratio falls below the commission authorized level.