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Ontario Transmission System

Presentation to F&ASC

April 16, 2003

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Ontario Transmission System- Highlights

• Nine major internal interfaces

• Ten transmission zones

• Eight interconnection points with Manitoba, Minnesota, Quebec, Michigan & New York

• Generally, several transmission networks at 500 kV, 230 kV and 115 kV voltage levels

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Map of Ontario

ONTARIOMAJOR 500kV & 230kVLINE ROUTES & STATIONS

QUEBEC

Hamilton

MILTONSEAFORTHDETWEILER

MIDDLEPORT

RICHVIEW

CLAIREVILLE

HANOVER

ORANGEVILLE

Lake Simcoe

Barrie

Toronto

160km

LakeSuperior

Moose RiverJames Bay

WAWA

To The WEST ZONE (See box)

Sault Ste. Marie

MISSISSAGI

ALGOMA

HANMER

SMITH FALLS

MERIVALEST LAWRENCE

HINCHINBROOKE

CATARAQUI

HAWTHORNE

ST ISIDORE

Lake Timiskaming

MARTINDALE

SudburyNorth Bay

DOBBIN

WIDDIFIELD

BUCHANAN

London

SCOTT

SarniaLONGWOOD

CHATHAM

LAUZON

Windsor

CANADA

UNITED STATES

Lake Erie

Niagara Falls

Kitchener

Lake Huron

Georgian Bay PARRY SOUNDMUSKOKA

MINDEN

TO QUEBEC

Ottawa

Ottawa River

Kingston

BELLEVILLE

Peterborough

Lake Ontario

CANADA

UNITED STATES

LEASIDE

BEACH

Abitibi River

PINARD

Mattagami River

KAPUSKASING

ANSONVILLE

KIDD CREEKMETSITE

Timmins PORCUPINE

DYMOND

MINNESOTA

Red Lake

Lake St. Joseph Albany River

Trout Lake

KENORA

DRYDEN

Lac Seul

Sioux Lookout

Lake ofthe Woods

LakeNipigon

MACKENZIE

UNITED STATES

MARATHON

Manitouwadge

Geralston

Rainy RiverFORTFRANCES

WAWA

LakeSuperior

CANADA

LONGUEUIL

Lake Nipissing

LENNOX (F)

OWEN SOUND

LAKEHEAD

BROCKVILLE

TRAFALGAR

BURLINGTON

ESSA

CHERRYWOOD

THUNDER BAY

MICHIGAN

NEW YORK

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NW NE

Essa

TorontoSW East

Niagara

West

Bruce

NY Niagara

Michigan

NY St. Lawrence

Quebec

Quebec

Quebecfuture HVDC

FABC

EWTW /EWTE

CLAN /CLAS

FN /FS

BLIP /NBLIP

FETT

QFW

Minnesota

Manitoba

Ontario Transmission System

Ottawa

Quebec

FIO

Lake Eriefuture HVDC

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Definition of Interface/Interconnection

• Interface and Interconnection definitions are formed by grouping one or more circuits (lines) for the purpose of measuring their combined flow at specific points and enforcing a power flow limit in MW.

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Major Interfaces• East-West (EW) - EW Transfer East(EWTE) & EW

Transfer West (EWTW)

• Flow North (FN)/Flow South (FS)

• Claireville North (CLAN)/Claireville South (CLAS)

• Flow Away from Bruce Complex (FABC)

• Buchanan Longwood Input (BLIP)/Negative BLIP (NBLIP)

• Queenston Flow West (QFW)

• Flow East Towards Toronto (FETT)

• Transfer East from Cherrywood (TEC)

• Flow Into Ottawa (FIO)

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Interface Limit Characteristics

• ‘Base’ limit

• All transmission facilities are in-service

• Directional

• Certain outages result in a penalty in MW

• Respect thermal limitations

• Preserve system and/or plant stability and maintain acceptable post-contingency voltage

• Some limits simple constants; others more complex

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Interface Base Limits

Interface Operating Security Limits (MW) BLIP 3,500 NBLIP 1,500 QFW 1,750 Summer, 1,950 Winter FABC 4,050-4,450 with four Bruce B units in-service*

4,440-4,950 with five Bruce units in-service* 4,500-5,300 with six 500 kV Bruce units in-service*

FETT 5,700** CLAN 2,000 CLAS 1,000 FIO 1,900 FN 1,900 FS 1,400 EWTE 325 EWTW 350

Summer Limits apply from May 1 to October 31. Winter Limits apply from November 1 to April 30.

(*) Limit varies to according BLIP/NBLIP flow. Published limit range based on the most restrictive contigency.

(**) If the summer Ontario demand exceeds 21,400 MW the limit is penalized by (OD-21400)/3 MW

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EWTE/EWTW Interface

• Boundary between the NW and NE zones

• Power flows related to power flows with Manitoba & Minnesota

• EWTE limit - 325 MW - preserve system stability

• EWTW limit - 350 MW - preserve system stability & maintain acceptable pre-contingency voltages

• Power flows from NW to NE

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FN/FS Interface

• Boundary between the NE and Essa zones

• FN limit - 1,900 MW - maintain acceptable post-contingency voltages

• FS limit - 1,400 MW - preserve plant stability

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CLAN/CLAS Interface

• Boundary between the Essa and Toronto zones

• CLAN limit - 2,000 MW

• CLAS limit - 1,000 MW

• Limits define boundary conditions for other system limits

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FABC Interface

• Boundary between the Bruce zone and the West and Southwest zones

• Flows are out

• FABC limit - 4,050-4,450 MW 4 units; 4,440-4,950 MW 5 units; 4,500-5,300 MW 6 units

• Preserve system and/or plant stability & maintain acceptable post-contingency voltages

• Limit improvement with generation rejection

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BLIP/NBLIP Interface

• Boundary between the West zone and the Bruce and Southwest zones

• BLIP limit - 3,500 MW - preserve system and/or plant stability & maintain acceptable pre-contingency and post-contingency voltages

• NBLIP limit - 1,500 MW - maintain acceptable post-contingency voltages

• NBLIP limit dependent on Bruce, Lambton & Nanticoke and reactor switching availability

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QFW Interface

• Boundary between the Niagara and SW zones

• QFW limit - 1,750 MW Summer; 1,950 MW Winter - respect thermal limitations

• Real-time, limit determined by ambient weather conditions

• No limit for flows opposite to QFW direction

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FETT Interface

• Boundary between the SW zone and the Essa and Toronto zones

• FETT Limit - 5,700 MW - preserve system and/or plant stability & maintain acceptable voltages

• Limit dependent on Nanticoke, Lakeview, Darlington, Pickering & Lennox plus FS flow

• Summer limit dependent on Ontario Demand

• No limit for flows opposite to FETT direction

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TEC Interface

• Boundary between the Toronto and East zones

• No pre-defined limit

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FIO Interface

• Boundary between the East and Ottawa transmission zones

• FIO Limit - 1,900 MW - maintain acceptable post-contingency voltages

• Real-time limit improvement with load rejection

• No limit for flows opposite to FIO direction

• Quebec High Voltage Direct Current (HVDC) interconnection project - limit increase to 3,000 MW

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NW NE

Essa

TorontoSW East

Niagara

West

Bruce

NY Niagara

Michigan

NY St. Lawrence

Quebec

Quebec

Quebecfuture HVDC

3120 MW

240 MW

650 MW

615 MW

215 MW

2925 MW

1010 MW

Minnesota

Manitoba

Snapshot Flows Jan. 23, 2003 @ approx. 18:00 hrs

Ottawa

Quebec

1470 MW

Lake Eriefuture HVDC

325 MW

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NW NE

Essa

TorontoSW East

Niagara

West

Bruce

NY Niagara

Michigan

NY St. Lawrence

Quebec

Quebec

Quebecfuture HVDC

3115 MW

50 MW

1910 MW

935 MW

255 MW

3165 MW

315 MW

Minnesota

Manitoba

Snapshot Flows Jan. 23, 2003 @ approx. 3:30 hrs

Ottawa

Quebec

1245 MW

Lake Eriefuture HVDC

1775 MW

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NW NE

Essa

TorontoSW East

Niagara

West

Bruce

NY Niagara

Michigan

NY St. Lawrence

Quebec

Quebec

Quebecfuture HVDC

FABC

EWTW /EWTE

CLAN /CLAS

FN /FS

BLIP /NBLIP

FETT

QFW

Minnesota

Manitoba

Ontario Transmission System

Ottawa

Quebec

FIO

Lake Eriefuture HVDC

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Interconnections

• Ontario-Manitoba - Ontario-Manitoba Transfer East (OMTE) & Ontario-Manitoba Transfer West (OMTW)

• Ontario-Minnesota - Minnesota Power Flow North (MPFN) & Minnesota Power Flow South (MPFS)

• Ontario-Michigan

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Interconnections(Continued)

• Ontario-New York Niagara & Ontario-New York St Lawrence

• Ontario-Quebec North & Ontario-Quebec South

• Quebec & Lake Erie HVDCs (future installations)

• Most of Ontario’s non-radial interconnections are under phase angle regulator (PAR) control, except for New York Niagara and part of Michigan (today)

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Interconnection Limit Characteristics

• ‘Base’ limit

• All transmission facilities are in-service

• Directional

• Certain outages result in a penalty in MW

• Manitoba & Minnesota - PAR deadband margins recognized in limits

• Quebec - summer and winter limits

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Interconnection Limit Characteristics (Continued)

• Michigan & New York - range of summer and winter flow limits

• Respect thermal and/or stability limitations

• Real-time, thermal limitations determined by ambient weather conditions

• Ontario coincident import/export capability - many factors

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Interconnection Base Limits

InterconnectionLimit - Flows Out of Ontario

MWLimit - Flows Into Ontario

MW

Manitoba 275 324

Minnesota(3) 140 90

New York St. Lawrence 400 400

Quebec North – Summer* 95(5) 65

Quebec South (East and Ottawa) - Summer* 740 1,385

New York Niagara (60 Hz and 25 Hz) – Summer*(1) 700-1,800 1,000-1,300

Michigan – Summer*(2,3) 1,700-2,100 700-1,700

Quebec North – Winter* 110(4) 84

Quebec South (East and Ottawa) - Winter* 760 1,385

New York Niagara (60 Hz and 25 Hz) – Winter*(1) 1,000-2,000 1,200-1,500

Michigan – Winter*(2,3) 1,800-2,200 1,200-1,700

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Ontario-Manitoba & Ontario-Minnesota

Interconnections

• PAR controlled

• Imports & exports constrained by stability and thermal limitations

• OMTW limit - 275 MW; OMTE limit - 275 MW; SK1 115kV limit - 49MW

• MPFN limit - 90 MW; MPFS limit - 140 MW

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Ontario-Quebec North Interconnection

• Radial connection

• Imports & exports are constrained thermal limitations

• Summer limits - imports 65 MW; exports 95 MW

• Winter limits - imports 84 MW; exports 110 MW

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Ontario-Quebec South Interconnection

• Radial connection

• Imports are constrained by stability limitations and available Quebec generation

• Exports are constrained by stability and thermal limitations

• Summer limits - imports 1,385 MW; exports 740 MW

• Winter limits - imports 1,385 MW; exports 760 MW

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Ontario-New YorkSt. Lawrence Interconnection

• PAR controlled

• Imports & exports are constrained by thermal limitations

• Limit - imports 400 MW; exports 400 MW

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Ontario-New York Niagara Interconnection

• Free flowing

• Imports & exports are comprised of scheduled flows plus unscheduled parallel path flows

• A range of flow limits for different weather and generation dispatch conditions

• Lower flow limit - unfavourable operating conditions; constrained by thermal limitations

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Ontario-New York Niagara Interconnection (Continued)

• Higher flow limit - favourable operating conditions; constrained by thermal limitations

• Generally, import capability never fully utilized

• Summer limits - imports 1,000-1,300 MW; exports 700-1,800 MW

• Winter limits - imports 1,200-1,500 MW; exports 1,000-2,000 MW

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Ontario-Michigan Interconnection

• Partial PAR control & free flowing (today)

• Imports & exports are comprised of scheduled flows plus unscheduled parallel path flows

• Full PAR control (Summer 2003)

• Imports & exports are expected to more closely match scheduled flows

• Partial vs. full PAR control does not materially change the flow limits

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Ontario-Michigan Interconnection(Continued)

• A range of flow limits for different operating conditions

• Exports - lower flow limit - no generation rejection is armed at Lambton

• Imports - higher flow limit - low generation levels at Lambton and TransAlta - Sarnia

• Summer limits - imports 700-1,700 MW; exports 1,700-2,100 MW

• Winter limits - imports 1,200-1,700 MW; exports 1,800-2,200 MW

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Unscheduled Power Flow - Michigan-Ontario-New York

• Lake Erie Circulation (LEC) is an unscheduled parallel path flow involving Michigan, Ontario & New York

• Occurs naturally

• Circulates through Ontario in a clockwise or counterclockwise direction

• Aggravates the BLIP and QFW interfaces

• Utilization of full PAR control at Michigan will control LEC in either direction to levels less than 600 MW

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Scheduled Power Flow - Michigan-Ontario-New York

• With partial PAR control at Michigan (MI), scheduled power flows across the MI and New York (NY) Niagara interconnections depend on system conditions

• When full PAR at MI is utilized, scheduled power flows with MI are more likely to be regulated across the MI interconnection

• This will alleviate unscheduled flows on the NY Niagara interconnection and in turn, allow scheduled flows with New York to be maintained

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NY - MichiganScheduled import example with partial

PAR control

Beck Generation = 1800Niagara load = 800QFW pre-load = 1000 QFW limit = 1750permissible inflow on NY interface = 750

Michigan Import Limit = 1700Michigan Import Schedule = 1700Michigan flow into Ontario = 1190+129 = 1319Michigan contribution on NY = 510

NY max additional import flow = 750 - 510 = 240NY max schedule = 240 / 0.65 = 369NY contribution on Michigan = 129 NY flow = 750

Import from NY & Michigan = 1700 + 369 = 2069

Michigan flow = 0.7 Michigan schedule + 0.35 NY schedule

NY flow = 0.3 Michigan schedule + 0.65 NY schedule

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Ontario Coincident Import/Export Capability

• With partial PAR control at MI, the coincident import/export capability is unlikely to equal the arithmetic sum of the individual flow limits

• When full PAR control is utilized, the coincident import/export capability could equal the arithmetic sum of the individual flow limits

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Ontario Coincident Import/Export Capability - Range

Phase-shifter control of the Michigan Interconnection

Limit - Flows Out of Ontario MW

Limit - Flows Into Ontario MW

Partial - Summer 2,350-5,550 2,964-5,264

Partial - Winter 2,685-5,885 3,483-5,483

Full - Summer 4,050-5,550 3,964-5,264

Full - Winter 4,485-5,885 4,683-5,483

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2,964 MW=324(MB)+90(MN)+400(NY St. Lawrence) +65(QC North)+1,385(QC South)+700(min. MI only)

3,964 MW=324+90+400+65+1,385+700(min. MI) +1,000 (min. NY Niagara)

5,264 MW=324+90+400+65+1,385+1,700(max. MI) +1,300 (max. NY Niagara)

Ontario Coincident Import/Export Capability - Example

Phase-shifter control of the Michigan Interconnection

Limit - Flows Into Ontario MW

Partial - Summer 2,964-5,264Full - Summer 3,964-5,264

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Ontario Coincident Import Capability

• Higher value in ranges achieved with low generation dispatch levels

• Generation levels rarely, if ever, materialize

• Expected Ontario coincident import capability is approximately 4,000 MW

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IMO Reports on Transmission Capacity

• Interface and interconnections limitations are identified in the IMO Security Status Report (SSR), Security and Adequacy Assessment Report (SAA) and 18-Month Outlook

• Different time periods covered

• Limitations identified as a penalty in MW

• Penalty is applied against the ‘base’ limit

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Example - SSR Report for April 11, 2003

Transmission InterfacesSystem Advisory/Summary Hourly Details H1-12 Hourly Details H13-24 Transmission Interfaces SAA

Notes

Internal Transmission Interface Limitations

FacilityPenaltyApplied

Date/TimeIssued

StartDate/Time

EndDate/Time

Comments

Positive BLIP -Positive BuchananLongwood Input

5002003/04/0815:08

2003/04/0617:00

2003/04/1211:00

C21J O/S

Negative BLIP -Negative BuchananLongwood Input

5002003/04/0815:08

2003/04/0617:00

2003/04/1211:00

C21J O/S

TEM - Transfer Eastof Mackenzie

752003/04/0114:42

2003/04/0707:00

2003/04/1106:00

K6F + X27A O/S

EWTE - East-WestTransfer East

502003/04/0114:42

2003/04/0707:00

2003/04/1106:00

K6F+X27A O/S

FETT - Flow East ToToronto

1502003/04/0414:51

2003/04/1013:00

2003/04/1105:00

Claireville T13 O/S

FETT - Flow East ToToronto

3502003/04/0116:13

2003/04/1105:00

2003/04/1118:00

Claireville T13 + C12R +Richview Terminal O/S

FETT Base limit=5,700MW; Limit=5,700-150-350=5,200MW

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End