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(millions of dollars except per common unit amounts)

Three months ended
December 31

Twelve months ended
December 31




2017 2016

Net income attributable to controlling interests





 Net income per common unit - basic and diluted(b)



$3.16 $3.21(c)
Cash distributions paid



(284) (250)
Class B distributions paid



(22) (12)
Cash distributions declared per common unit



$3.94 $3.71
Earnings before interest, taxes, depreciation and amortization (EBITDA)(d)



445 433(a)
Distributable cash flow(d)



310 313(a)



Weighted average common units outstanding - basic and diluted (millions)(e)



69.2 65.7
Common units outstanding, end of period (millions)(e)



70.6 67.4

(a) Recast information to consolidate PNGTS for all periods presented as a result of additional 11.81 percent in PNGTS that was acquired from TransCanada Corporation (TransCanada) on June 1, 2017, increasing the Partnership's ownership in PNGTS to 61.71 percent.  Prior to this transaction, the Partnership owned a 49.9 percent interest in PNGTS that was acquired from TransCanada on January 1, 2016.  For more information, refer to our Annual Report on Form 10-K for the year ended December 31, 2017, as filed with the Securities Exchange Commission (SEC).
 (b) Net income per common unit is computed by dividing net income attributable to controlling interests, after deduction of net income attributed to PNGTS' former parent and amounts attributable to the General Partner and Class B units, by the weighted average number of common units outstanding.  Refer to Financial Summary-Consolidated Statements of Income section of the February 23, 2018 News Release entitled 'TC PipeLines, LP Announces 2017 Fourth Quarter and Year End Financial Results'.
 (c) Net income per common unit prior to recast.

 (d) Distributable cash flow and EBITDA are non-GAAP financial measures.  For further detail, refer to the description of these non-GAAP financial measures in the section entitled 'Non-GAAP Measures' and the Supplemental Schedule in the February 23, 2018 News Release entitled 'TC PipeLines, LP Announces 2017 Fourth Quarter and Year End Financial Results'.
 (e) Under the ATM program, the Partnership issued 953,430 and 3,118,592 units during the three and twelve months ended December 31, 2017, respectively.