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DEBT AND CREDIT FACILITIES (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of debt and credit facilities
(millions of dollars)2020Weighted Average Interest Rate for the Year Ended December 31, 20202019Weighted Average Interest Rate for the Year Ended December 31, 2019
TC PipeLines, LP
Senior Credit Facility due 2021 
 
— — 
2013 Term Loan Facility due 2022450 
1.87 %450 3.52 %
4.65% Unsecured Senior Notes due 2021
350 
(c)
4.65 %
(a)
350 4.65 %
(a)
4.375% Unsecured Senior Notes due 2025
350 
4.375 %
(a)
350 4.375 %
(a)
3.90% Unsecured Senior Notes due 2027
500 
3.90 %
(a)
500 3.90 %
(a)
GTN
5.29% Unsecured Senior Notes due 2020
 
 100 5.29 %
(a)
5.69% Unsecured Senior Notes due 2035
150 
5.69 %
(a)
150 5.69 %
(a)
3.12% Series A Senior Notes due 2030
175 
3.12 %
(a)
— — 
PNGTS
Revolving Credit Facility due 202325 
1.88 %39 3.47 %
2.84% Series A Senior Notes due 2030
125 2.84 %
(a)
— — 
Tuscarora
Unsecured Term Loan due 202123 
2.13 %23 3.39 %
North Baja
Unsecured Term Loan due 202150 
1.70 %50 3.34 %
2,198 
2,012 
Less: unamortized debt issuance costs and debt discount7 
Less: current portion423 
(b)
123 
1,768 
1,880 
(a)Fixed interest rate.
(b)Includes the Partnership's 4.65% Unsecured Senior Notes due June 15, 2021, Tuscarora’s Unsecured Term Loan due August 20, 2021 and North Baja's Unsecured Term Loan due December 19, 2021.
(c)Refer to Note 21- Subsequent events for more details on the Partnership's announcement on its intention to exercise its option to redeem this Unsecured Senior Notes at March 15, 2021.
Schedule of principal repayments required on debt
The principal repayments required by the Partnership on its consolidated debt are as follows:
(millions of dollars)
2021423 
2022450 
202325 
2024— 
2025350 
Thereafter950 
2,198