DEBT AND CREDIT FACILITIES (Tables)

3 Months Ended

Mar. 31, 2018

(unaudited) (millions of dollars)	March 31, 2018		Weighted Average Interest Rate for the Three Months Ended March 31, 2018		December 31, 2017		Weighted Average Interest Rate for the Year Ended December 31, 2017

TC PipeLines, LP
Senior Credit Facility due 2021	165		2.85	%	185		2.41	%
2013 Term Loan Facility due 2022	500		2.86	%	500		2.33	%
2015 Term Loan Facility due 2020	170		2.75	%	170		2.22	%
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)	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		2.55	%	55		2.02	%
PNGTS
5.90% Senior Secured Notes due 2018	24	(b)	5.90	%(a)	30	(c )	5.90	%(a)
Tuscarora
Unsecured Term Loan due 2020	25		2.73	%	25		2.27	%

	2,389				2,415
Less: unamortized debt issuance costs and debt discount	12				12
Less: current portion	45	(b)			51	(c)

	2,332				2,352

(a)

Fixed interest rate

(b)

Includes the PNGTS portion due at March 31, 2018 amounting to $6.1 million that was paid on April 2, 2018.

(c)

Includes the PNGTS portion due at December 31, 2017 amounting to $5.8 million that was paid on January 2, 2018.