DEBT AND CREDIT FACILITIES (Tables)

12 Months Ended

Dec. 31, 2017

DEBT AND CREDIT FACILITIES

Schedule of debt and credit facilities

(millions of dollars)		2017		Weighted Average Interest Rate for the Year Ended December 31, 2017		2016(b)		Weighted Average Interest Rate for the Year Ended December 31, 2016(b)
TC PipeLines, LP
	Senior Credit Facility due 2021	185		2.41%		160		1.72%
	2013 Term Loan Facility due 2022	500		2.33%		500		1.73%
	2015 Term Loan Facility due 2020	170		2.22%		170		1.63%
	4.65% Unsecured Senior Notes due 2021	350		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)	–		–
GTN
	5.29% Unsecured Senior Notes due 2020	100		5.29%	(a)	100		5.29%	(a)
	5.69% Unsecured Senior Notes due 2035	150		5.69%	(a)	150		5.69%	(a)
	Unsecured Term Loan Facility due 2019	55		2.02%		65		1.43%
PNGTS
	5.90% Senior Secured Notes due 2018	30		5.90%	(a)	53		5.90%	(a)
Tuscarora
	Unsecured Term Loan due 2020	25		2.27%		10		1.64%
	3.82% Series D Senior Notes due 2017	–		–		12		3.82%	(a)
		2,415				1,920
Less: unamortized debt issuance costs and debt discount		12				9
Less: current portion		51	(d)			52	(c)
		2,352				1,859

(a)	Fixed interest rate.
(b)	Recast to consolidate PNGTS (Refer to Notes 2 and 7).
(c)	Includes the PNGTS portion due at December 31, 2016 amounting to $5.5 million that was paid on January 3, 2017.
(d)	Includes the PNGTS portion due at December 31, 2017 amounting to $5.8 million that was paid on January 2, 2018.

Schedule of principal repayments required on debt

(millions of dollars)
2018	51
2019	36
2020	293
2021	535
2022	500
Thereafter	1,000
	2,415