NGA Pre-Winter Briefing on System ReliabilityNovember 2, 2017Mike DirraneU.S. Marketing

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Enbridge U.S. Transmission Map

Miles of Pipe: 14,129

Compressor Stations: 137

Total Horsepower: 2,391,488

Leidy

SteckmanRidgeAccident

OakfordVector

Texas Eastern

East Tennessee

Algonquin

Maritimes & Northeast

SabalTrail

Gulfstream

SESH

Big Sandy

Moss Bluff

Egan

Bobcat

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Ozark

AGT System Utilization

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

TETCO System Utilization

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

2017 Integrity Summary

Assessments AGT TETLP NE Region Total

ILI runs 18 34 52

Anomalies from 2017 ILI 24 97 121

Scheduled Anomalies 41 76 117

Anomaly Repair Breakdown AGT TETLP NE Region Total

Recoat 21 91 112ClockSpring (composite sleeve) 10 62 72

Pipe Replacement 17 8 25Type B Sleeve 1 1 2

Maintenance Programs

• Turbine overhauls and inspections• Completed at intervals established with the OEM’s

• Solar fuel systems and unit bore scope inspections • Based on a fired hour interval

• Recip Units• Engine Analysis completed on an operating hour internal.

• Periodic, annual, and hour based mechanical and electrical system inspections and testing.• Turbines• Recips• Electric Motor Drives

Continuous Improvement

• Completed review of Maintenance Standards in (5 to 7 year frequency)• Annual ad hoc review of Maintenance Standards• Formalized Winter and Storm Preparation procedures• Review and update annually program/plan• SOP Effectiveness Reviews (1 to 3 year frequency)

E-1 System9.1 mi L&R 6”w/16”

Cromwell Discharge2.0 mi 36” Loop

Ramapo to Stony Point3.3 mi L&R 26”w/42”

E-1 System1.3 mi 12” Loop

SouthburyMiddletown-YGS

WillimanticMontvilleGuilford

GlastonburyAssonet

North Fall RiverWellesleyNorwoodBrockton

Middleborough

Cromwell C/SAdd Mars 100 (15,900 HP)

Burrillville C/SAdd Mars 100 (15,900 HP)

2016

2015YEAR COLOR KEY

PeekskillCortlandt

West DanburyPutnumPomfret

WaterburyOakland Heights

GreenvilleNorth HavenFarmingtonNeedham

MysticNew BedfordWest Roxbury

Stony Point C/SAdd 2 Mars 100s (31,800 HP)

Southeast C/SAdd Taurus 70 (10,320 HP)

2015/2016

West Roxbury Lateral4.2 mi New 16”0.9 mi New 24”

AIM Total HP = 81,620

YorktownDanbury

Salem PikePine HillsPlymouthNeedham

Stony Point Discharge12.3 mi L&R 26”w/42”

(Includes new 0.7 mi 42” Hudson River HDD)

4.1 mi L&R 26” w/42”

Weymouth C/S (Proposed)Taurus 70 (10,900 HP)

Oxford C/SAdd Taurus 70 (10,900 HP)

Southeast Discharge4.5 mi L&R 26”w/42”

Includes Rt 84 HDD (0.7 miles)

2.3 mi L&R 26” w/42”

AB Total HP = 28,100

Chaplin C/SAdd Taurus 60 (7,700 HP)

Add Centaur 50 (10,900 HP)2017

AIM Meter & Regulator Stations 3 new stations

23 station modifications

AB M&R Stations 1 new station

5 station modifications

Algonquin Incremental Market 342 Project and

Atlantic Bridge 132 Project

AB

AIM

Incident location

Texas Eastern in Pennsylvania

Penn-Jersey Evaluations (Post Delmont)

• Excavation and Evaluation of pipe with tape coating throughout four Compressor Stations on PJ System. No significant integrity concerns found.

• Excavation and Evaluation of pipe with tape coating at three (3) crossover headers on PJ System. No significant integrity concerns found.

• Completed Close Interval Survey (CIS) Delmont to Armagh.• Performed twenty-four (24) Stress Corrosion Cracking Direct Assessments

(SCCDA). No indications of SCC observed.

Improving New England’s future energy reliability, cost volatility and competitiveness

Regional Supplies

HalifaxSt. John

Fredericton

Bangor

Portland

Portsmouth

Boston

Atlantic BridgeProject Scope:• ~135 MMcf/d expansion of the Algonquin and

Maritimes & Northeast Pipelines Project Status:• Filed FERC application Oct 2015• FERC certificate received Jan 2017• In-service 2H17 – 2H18

Access Northeast• Joint development with Eversource & National GridProject Need:• Natural gas generation has increased from 15% to 50%

market share since 2000• Additional natural gas infrastructure is needed to serve

growing gas generation

Northeast Expansions on AlgonquinAccess Northeast & Atlantic Bridge

Algonquin and Maritimes systems directly connect to 60% of ISO-NE’s gas-fired generators

New gas-fired generators totaling ~2,570 MW attaching to Algonquin by 2019

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