TC Pipelines (TCP) 8-K Regulation FD Disclosure

Exhibit 99.1

Northern Border
Chicago IV
Expansion Project

CS 18

CS 17

CS 16

Harper

Existing Pipeline

Compressor Stations

Future Compressor
Stations

•220 MMcf/d of additional capacity
from Harper, Iowa to Manhattan

•Binding Open Season Results:

•Excess of 220 MMcfd

•Terms ranging from 10 - 11
years

•Subject to Contingencies

•9/12 Upstream Pipeline &
Mgmt Approval

•11/3 Reduction Rights
via ROFR/Cap Release

•Expansion requirements include:

•Installing a new 16,000 HP
compressor (CS15)

•MAOP Upgrade

•Re-Wheeling at CS 14, 16, 18

•Estimated cost $97 million

•Proposed in-service November 2010

MN

WI

IN

MI

IL

IA

MO

CS 14

CS 15

Manhattan

Chicago