TC Pipelines (TCP) 10-K2018 FY Annual report

Filed: 21 Feb 19, 4:52pm

Content analysis

Positive
Negative
Uncertain
Constraining
Legalese
Litigous
Readability	H.S. sophomore Avg

New words: Abeyance, abundant, accidental, adherence, ADIT, ANPRM, anytime, arbitrary, argued, arguing, automation, Avangrid, ban, Berge, BergeNadine, Blum, Brett, BrettSean, broker, Bronx, Brookfield, bundled, buried, buyout, byproduct, career, cashflow, categorized, CERCLA, Chapman, Chapter, Cheyenne, Citigroup, Cleanup, comeback, Commack, commensurate, commonly, concept, constrained, contrary, convened, coordinated, corrosion, coupled, culminated, Curve, danger, DC, DEC, declaratory, DEEP, deficient, dekatherm, deleverage, deliverability, denial, disaggregation, disallowing, disregarded, disseminate, dissolve, dithiazine, Dixon, Eastchester, EBP, ECAF, eighteen, emitting, ERISA, erosion, escalating, essentially, evidentiary, exit, expedient, explanation, facilitate, familiarity, fossil, GATX, hazard, honor, hub, Hunt, hydrogen, hydrostatic, ILP, IM, immaterial, incidental, inclement, incorrect, inflow, inhibit, inhibited, interacted, Intercompany, intermittent, interzone, irrevocable, Itron, largest, lay, leasehold, legacy, lengthy, LEP, Letter, Licensed, LNA, load, lumpsum, Macleod, magnitude, merit, moderate, modernize, Moody, moratoria, MorrisWilliam, mother, MUFG, Nadine, NOCA, NOI, noncontributory, NOPR, NY, offshore, outlined, outlining, overpressure, oversee, package, people, perspective, pertinent, pigging, Poor, postretirement, powdery, precise, prepackaged, presumption, principle, proactive, prompted, PSD, Rabbi, rationale, RCRA, ready, Reauthorization, rebalanced, recodify, redeployment, redevelopment, refusing, reintroduced, relieved, remitted, remote, rendered, repaid, requisite, residential, rest, RP, scavenger, Sean, Sedimentary, seeding, Shapiro, showed, simplification, simultaneously, site, small, speculate, spill, stand, Stanley, statutorily, steady, stewardship, style, subsidence, subtotal, sue, sulfide, Superfund, surface, TCILP, Tenneco, text, tire, top, trend, triazine, tribe, unbilled, unclassifiable, unclear, unconditional, uncontested, undertaken, underwriter, unregulated, unsolicited, upheld, valorem, vehicle, viable, Voluntary, warranted, WIP, worker, WQC, Wright, writ, Yield

Removed: abandon, abatement, Aboriginal, acceptable, accident, acquiring, adjacent, advisory, aimed, allegation, analyzed, Anderson, appealed, boosting, Brandon, calculating, Carty, Catharine, clarify, clerk, comparing, complaint, Computation, Continental, conventional, correlative, CWA, DavisM, delegated, depending, depth, discharge, dredge, effort, emerged, endangerment, ESA, expanding, feasible, foundation, heard, history, Hunter, HunterJoel, identify, Interior, intimate, Joel, Johannson, JohannsonKarl, jury, Karl, materialize, matured, membership, Narrative, nationwide, NEPA, NGTL, nominal, noncash, OPA, permanently, post, prepare, prohibited, proper, rent, replacement, ruled, specialty, stayed, successor, Superior, superseded, toll, trial, unidentified, unwilling, utilizing, wetland

Search this filing

Filing tables

Export all tables to Excel

Filing exhibits

Related press release

Associated TCP transcripts

TCP similar filings

Filing view

Default size S M L
Default font Times Arial

External links

Share this filing

QuickLinks -- Click here to rapidly navigate through this document

Exhibit 21.1

SUBSIDIARIES OF THE REGISTRANT

1.: The Registrant holds a 98.9899 percent limited partner interest and, through its TCP Intermediate GP, LLC subsidiary, a 1.0101 percent general partner interest in TC GL Intermediate Limited Partnership, a Delaware limited partnership.
2.: Through its interests in TC GL Intermediate Limited Partnership, the Registrant holds a 46.45 percent general partner interest in Great Lakes Gas Transmission Limited Partnership, a Delaware limited partnership.
3.: The Registrant holds a 98.9899 percent limited partner interest and, through its TCP Intermediate GP, LLC subsidiary, a 1.0101 percent general partner interest in TC PipeLines Intermediate Limited Partnership, a Delaware limited partnership.
4.: Through its interests in TC PipeLines Intermediate Limited Partnership, the Registrant holds a 50 percent general partner interest in Northern Border Pipeline Company, a Texas general partnership.
5.: Through its interests in TC PipeLines Intermediate Limited Partnership, the Registrant wholly-owns Gas Transmission Northwest LLC, a Delaware limited liability company.
6.: Through its interests in TC PipeLines Intermediate Limited Partnership, the Registrant wholly-owns Bison Pipeline LLC, a Delaware limited liability company.
7.: Through its interests in TC PipeLines Intermediate Limited Partnership, the Registrant wholly-owns North Baja Pipeline, LLC, a Delaware limited liability company.
8.: Through its interests in TC PipeLines Intermediate Limited Partnership, the Registrant holds a 61.71 percent general partner interest in Portland Natural Gas Transmission System, a Maine general partnership.
9.: The Registrant holds a 98.9899 percent limited partner interest and, through its TCP Intermediate GP, LLC subsidiary, a 1.0101 percent general partner interest in TC Tuscarora Intermediate Limited Partnership, a Delaware limited partnership.
10.: Through its interests in TC Tuscarora Intermediate Limited Partnership, the Registrant wholly-owns TC Pipelines Tuscarora LLC, a Delaware limited liability company.
11.: Through its interests in TC Tuscarora Intermediate Limited Partnership and TC Pipelines Tuscarora LLC, the Registrant wholly-owns Tuscarora Gas Transmission Company, a Nevada general partnership.
12.: The Registrant wholly-owns TC PipeLines Intermediate GP, LLC a Delaware limited liability company.

QuickLinks

Exhibit 21.1

SUBSIDIARIES OF THE REGISTRANT