Project Location and Existing Transmission System

Filed: March 29, 2007 EB-2007-0050 Exhibit B Tab 1 Schedule 1 Page 1 of 5

1 PROJECT LOCATION AND EXISTING TRANSMISSION SYSTEM

3 1.0 PROJECT LOCATION

5 The transmission project described in Exhibit B, Tab 2, Schedule 1 is located in

6 southwestern Ontario. The transmission elements of this project extend from the Bruce

7 Power Complex on the eastern shore of Lake Huron (north of Kincardine) to west of

8 Orangeville in Dufferin County, and continue to Hydro One’s Milton Switching Station

9 (SS) in the western Greater Toronto Area (GTA). The route passes through four counties

10 and one regional municipality

11 (Bruce, Grey, Wellington, Legend 12 Dufferin, and Halton, 500 kV Circuit 230 kV Circuit 13 respectively) and eleven Nuclear Generating Facility 14 Coal Generating Facility municipalities (Kincardine, OWEN SOUND

15 Brockton, Hanover, West

Bruce Nuclear 16 Grey, Southgate, Wellington Complex

17 North, Erin, East Luther

18 Grand Valley, East ORANGEVILLE

19 Garafraxa, Halton Hills and MILTON DETWEILLER 20 Milton). A detailed map of

21 the project location and the

22 existing transmission

LONGWOOD 23 facilities is provided in Nanticoke GS 24 Exhibit B, Tab 1, Schedule 2. Source: OPA

25 Filed: March 29, 2007 EB-2007-0050 Exhibit B Tab 1 Schedule 1 Page 2 of 5

1 2.0 EXISTING TRANSMISSION FACILITIES IN SOUTHWESTERN

2 ONTARIO

4 Southwestern Ontario is the area of southern Ontario that lies to the west of the GTA and

5 Barrie. This area has a number of large generating stations such as Bruce, Nanticoke,

6 Lambton (and Beck in the Niagara area) with a total of approximately 15,000 MW of

7 generation. The area also includes major load centers such as Hamilton, Windsor and

8 Kitchener-Waterloo-Cambridge-Guelph. Table 1 summarizes generation, peak demand

9 and interconnection capability in southwestern Ontario during the summer of 2005.

11 Table 1: Generation, Load and Interconnection Capacities in SW Ontario (2005) Generation (MW) Loads (MW) Bruce 5,060 Windsor/Essex 1,000 Nanticoke 3,945 Sarnia 800 Lambton 1,972 London 750 Beck 2,006 KWCG 1,400 Windsor area gas 739 Hamilton 1,300 Sarnia 510 Woodstock/Ingersoll 195 Other 746 Brantford/Brant 250 Niagara 1,020 Other 2,100 Total Generation 14,978 Total Load 8,815 Interconnections Capability Michigan New York at Niagara Import - Summer 1,550 Import - Summer 1,300 Export - Summer 1,950 Export - Summer 1,300 Import – Winter 1,750 Import – Winter 1,650 Export - Winter 2,200 Export - Winter 1,950

12 Source: OPA, Ontario’s IPSP Discussion Paper #5 Filed: March 29, 2007 EB-2007-0050 Exhibit B Tab 1 Schedule 1 Page 3 of 5

1 The transmission assets in southwestern Ontario connect the major generation and load

2 centers in the region to the interconnected grid. Almost half of the generating capacity in

3 the region supplies the energy needs of other parts of the province. Furthermore, the

4 Bruce Power Complex currently provides approximately 20% of the Province’s peak

5 power needs. The transmission facilities in this area are designed and placed to support

6 this concentration of generation capacity, respecting physical constraints such as system

7 and voltage stability, and thermal limits. This is a tightly interconnected system, where

8 the availability and performance of each major element (especially the 500 kV facilities)

9 can affect the integrity of the entire network and neighbouring jurisdictions.

11 2.1 Generation Resources in the Bruce Area

13 The generation capacity at the Bruce Power Complex currently totals 5,060 MW, i.e.,

14 four 890 MW nuclear units at Bruce B and two 750 MW units at Bruce A operating at

15 maximum capacity. By 2009, an additional 725 MW of committed wind generation

16 through the Provincial Government’s renewable energy initiatives will bring the total

17 generation capacity in the Bruce area to 5,785 MW. In 2009 Bruce Power is expected to

18 return to service two 750 MW units at Bruce A that are currently being refurbished under

19 Provincial Government contract. At the same time, Bruce Power is expected to remove

20 one of the operating 750 MW units from service for an extended maintenance outage. By

21 2012, scheduled maintenance work at the Bruce Power Complex will be completed and

22 the total committed generation in the Bruce area will increase to 7,285 MW.

24 As part of the development of the Integrated Power System Plan (IPSP), the OPA’s

25 Transmission Discussion Paper No. 5 (pages 39-53) indicates that there is considerable

26 potential for additional renewable generation, particularly wind generation, in the Bruce

27 area. Another 1,000 MW of wind generation is expected, for a total of about 8,300 MW Filed: March 29, 2007 EB-2007-0050 Exhibit B Tab 1 Schedule 1 Page 4 of 5

1 in this area (refer to Exhibit B, Tab 6, Schedule 5, Appendix 5). Figure 1 illustrates

2 OPA’s forecast generation in the Bruce area from 2007 to 2014.

4 Figure 1: Bruce Area Available Generation (2007 – 2014)

9000

8000

7000

6000

5000

4000 Power (MW) 3000

2000 Legend Future Wind Generation 1000 Committed Wind Generation Bruce Power 0 Jul-07 Jul-09 Jul-12 Jul-08 Jul-10 Jul-11 Jul-13 Jul-14 Oct-11 Oct-13 Oct-07 Oct-08 Oct-09 Oct-10 Oct-12 Apr-07 Apr-08 Apr-09 Apr-10 Apr-11 Apr-12 Apr-13 Oct-14 Apr-14 Jan-07 Jan-08 Jan-09 Jan-10 Jan-11 Jan-12 Jan-13 Jan-14 Date 5 6 Source: OPA, Ontario’s IPSP Discussion Paper #5

8 2.2 Transmission Resources in Southwestern Ontario

10 The generation from Bruce Power Complex and the existing Bruce area wind generation

11 are currently incorporated into the grid via 500 kV and 230 kV transmission lines as

12 follows:

13 • The 500 kV Bruce x Milton SS and Claireville TS double-circuit tower line, B561M

14 and B560V;

15 • The 500 kV Bruce x Longwood TS double-circuit tower line, B562L and B563L; Filed: March 29, 2007 EB-2007-0050 Exhibit B Tab 1 Schedule 1 Page 5 of 5

1 • The 230 kV Bruce x Orangeville TS double-circuit tower line, B4V and B5V;

2 • The 230 kV Bruce x Detweiler TS double-circuit tower line, B22D and B23D; and,

3 • The 230 kV Bruce x Owen Sound TS double-circuit tower line, B27S and B28S.

5 Major 500 kV facilities in southwestern Ontario include 500 kV transformer or switching

6 stations at the Bruce Power Complex, Milton SS, Longwood TS (west of London),

7 Nanticoke GS (east of Port Dover), and Middleport TS (east of Brantford). A detailed

8 map of the existing transmission facilities is provided in Exhibit B, Tab 1, Schedule 2.

10 Depending on the load, generation and import patterns, these circuits have about 5,000

11 MW of transmission capacity to deliver the output from the Bruce Power Complex and

12 the existing wind generation. The maximum transmission capacity is based on applicable

13 reliability standards (Northeastern Power Coordinating Council (“NPCC”), North

14 American Electric Reliability Council (“NERC”)) and the planning assumption that with

15 all remaining circuits in-service, the power system performance should satisfy required

16 criteria and guidelines following the loss of any of the double-circuit lines (first

17 contingency).

19 In summary, the present-day transmission system has the capability to transmit the

20 currently available generation from the Bruce area, but is not sufficient to transmit the

21 additional generation that is committed and planned for the area.

22 Filed: March 29, 2007 EB-2007-0050 Exhibit B Tab 1 Schedule 2 Page 1 of 1

1 MAP OF EXISTING FACILITIES ESSA TS Blue Mountains C 4 S D 9 2E O R Y RD 40 4 AL NT U N OU GIO C N H Devils Glen Provincial Park E Existing Facilities Bruce to Milton Area I C R Exhibit B-1-2 T G H O 4 Y W 30 4 MacGregor Point Provincial Park D U A R 4 Clearview R Y 4 Chatsworth Y NT N D Saugeen Shores D 1 U R 0 O T AL S C N 1 Y 7 3 2 GIO 2 E 4 B Arran-Elderslie R R Canadian D H

I H 1 Foces G BRUCE A TS 4 IG 3 Grey Highlands 25 H H ALLISTON TS BRUCE HW PLANT D TS Y RD W 4 Base NT W A Noisy River Provincial Park COU 2 4 Y DOUGLAS POINT TS A 1 1 Innisfil RD Borden E Y TY 0 UN 2 4 Essa 5 BRUCE HW PLANT B TS O 5 R BRUCE B SS 6 C 2 1 C D A E 1 2 O O R G V Inverhuron Provincial Park IDE GREY U S IO C 2 N N 9 O 8 T Y C A A U Y W O L H N 5 G I

R R SIMCOE H T U L 4 Y N D D 2 I 9 3 N 8 T 4 2 R 1 1 Y E A Y L W I 2 3 D N H D H 4 Mulmur G R E 4 I I 4 H R 4 G 3 4 N 4 4 RD D H 0 E 1 Y Y W 4 NT 4 D OU 1 A Bradford T Kincardine C A O 4 Y ER Earl Rowe Provincial Park N 1 ID 4 0 S West U 2 O Gwillimbury n C HANOVER TS West Grey Adjala-Tosorontio Brockton Melancthon C 4 O INE C L BRUCE U 8 B O Hanover o N 2 U Boyne Valley Provincial Park T R 2 2 Y N D E New Tecumseth 1 T G S R 2 Y I I 4 D O D r V Y 7 H R 8 E A IG 2 E N H D Shelburne R W D W 0 H Southgate A O R A 4 3 I L H Y G 9 T A G 4 R Y 2 H O I D u D T W H Mono Cliffs Provincial Park T

N 1 5 T C A U 5 Y 0 E 2 O O N 4 B 4 C U 9 2 H

N 3 2 A H Mono T D E M Y 5

1 R R 4 C 0 Huron-Kinloss D D 1 O V

DUFFERIN 4 D 4 U B N R 4 South Bruce L A Hockley Valley Provincial Nature Reserve M C T U B Y O Amaranth E T U Y King E R N L N W E T R 2 e Y Y V 9 U R C 9 Y R D A A D D O 6 4 O E W YORK R.M. 4 H T 2 IG C U H E 8 N

R 4 T

k 2 4 Y H East Luther ORANGEVILLE TS 4 D R W D R F D T ING O 1 C Grand Valley H K Y D C Orangeville R R 0 O E A O E 4 H 2 G D U I

a 4 D R D U I O 4 R P C Y W N R O RR N S O U BE Wellington North T R E N N I T 4 N Y KLEINBURG TS R C 9 L T U 0 T R Y K T Y 1 O D H R 2 R IC Minto H D V D W R R T D 6 O R Y 4 Vaughan H 7

H C I T S L 8 G 5 6 L D N 4 D H U D 4 I E I O O B N G W C L B 1 E U 6 H R Caledon L WINGHAM TS E A 6 G N 4 A Howick W R Y 4 A 4 H V T E D 4 A 6 C R 4 R Y L D N Y 2 East Garafraxa 4 O 3 4 E ST R I 8 6 N HA RR PEEL D D 9 Forks of the Credit Provincial Park D 5 I 4 I L R X 2 5 PALMERSTON TS W B 4 IE K N V IN 4 1 R Ashfield- O O 1 6 S H 4 M T 4 D O D I D O D G 2 A T 4 GOREWAY TS R N N M Colborne- R H 4 2 IN I S B 2 W C S O 9 H S G Y L 4 Y A 1 D S Wawanosh 3 C R T U IS N N Morris-Turnberry 2 O T Y R I North Huron 0 U D 4 4 S N C 4 N N 6 Y C A K O Y T R 8 H U 1 Y U 2 1 T T U O N A R N R IL G D T D O Y L Y W & D U A A 8 C T F B R 9 R R D H 4 4 O A L M 8 N Y L V D O 6 G D 2 C Point Farms Provincial Park R I U T C Erin G D 4 4 1 A Brampton R H R N O 4 IS O U R R Y D U N D C R T 4 R WELLINGTON O T D 4 Y BRAMALEA TS N 0 C 4 1 Y 4 R U Mapleton T 7 D 1 O D N 1 FERGUS TS 2 PLEASANT TS 6 4 HURON C R U D 4 4 4 0 R N Y D O 8 5 E E T 1 C Y 1 D AY B N W T C CARDIFF TS LY I R N 0 D R W 7 GODERICH TS T Y H N O H 2 1 Goderich H L R U R U D U Y G R North Perth O Y N T I Morris Tract Provincial Nature Reserve D S 4 O T GUELPH ST 2 1 4 L C C T Y N H E N Centre Wellington U U R 1 H S D O B C 4 O O C U S U 2 C O 1 R A C N C 1 U O 1 T U 9 O S U Y 4 R 3 R N N 1 D N E T T R Central Huron B Y 45 Y C E Halton Hills

R R D 4 O L Huron East D G R R U I D I 7 R E D O N 2 4 G N N MEADOWVALE TS H IO 7 T 2 E N 4 Y A B T ELMIRA TS L A D R 5 1 4 L 10H R R D R 6 D Guelph/Eramosa D 0 Mississauga D 4 E 8 4 V 1 1 T LINE R P 6 4 2 CU PERTH 4 LIN 4 5 E 86 4 4 1 1 1 Perth East E L MILTON SS HALTON TS Transmission Stations Transmission Lines Major Roads Canadian Forces Base Borden AM M CAMPBELL TS 4 E IR TRAFALGAR TS BP STATION N A 1 T 4 LINE 4 1 2 R 1 1 Woolwich D HALTON R.M.

500 kV 500 kV 3 4 4 Guelph Conservation Area Water Body 1 D W TRAFALGAR TS T R S D S Y Wellesley E T R L CEDAR TS 1 R 2 230 kV 230 kV T AR 1 E 1 H N N 0 M Provincial Parks Municipal Boundary CH T 4 A SEAFORTH TS T U T S HANLON TS Y I R S N O WATERLOO R.M. IA C A E E O W C R IGH R 115 kV 115 kV © PCopyright Hydro one Inc. All rights reserved. No part of thisdrawing may be redistributed TO U H Milton D PALERMO TS Counties C N P W 1 I 4 or reproduced in any fEorm by any photographic, electroEnIMic,A mRe LcIhNanical or any other means, V 4 T R E 4 D 1 or used in any informatioTn Hstorage or retrieval system. R Y 1 Oakville L H I T R N Waterloo U 1 Neither Hydro One Inc. nor any Eof its subsidiaries assumes liability for any errors or omissions. D 4 N W SS 4 A E O F BE K 3 Puslinch Produced by: Inergi LP Z R 2 HAMILTON - WENTWORTH R.M. 1 BRONTE TS S Produced by Hydro One Inc. under Licence wIGith the Ontario Ministry of Natural Resources T 4 GIS Services E V E 4 5 0 10 20 40 © Queen’s Printer for Ontario, 2006. DETWEILER TS Burlington 7 1 R 1 8 Wilmot Cambridge B Date: November 2006 6 R Hamilton 1 Map06-183_Ex_B_1_2_v3 D Kitchener 1 M Kilometers D 43 4 1 NOT TO BE RECPROOUDNUTYC ERD OR REDISTRIBUTED4 CONFIDENTIAL TO HYDRO 1ONE NETWORKS 1 PRESTON TS Filed: March 29, 2007 EB-2007-0050 Exhibit B Tab 1 Schedule 3 Page 1 of 2

1 NEED FOR PROPOSED FACILITIES

3 1.0 BACKGROUND

5 As set out in its Transmission Licence, Hydro One must comply with the requirements of

6 the Transmission System Code (“TSC”) and various regulatory bodies. The need for the

7 proposed facilities is based on these requirements including maintenance of acceptable

8 voltages, keeping equipment operating within established ratings, and maintaining system

9 stability, during both normal operation and under recognized contingency conditions on

10 the transmission system. These requirements of government and industry regulatory

11 authorities include those of NPCC, NERC, and the Ontario Energy Board (“OEB”).

13 2.0 NEED FOR THE PROJECT

15 Under the Electricity Act, 1998 (the “Act”), the OPA has the responsibility for long-term

16 power system planning in Ontario. In accordance with the Act, the OPA is required to

17 periodically develop an IPSP. As part of the IPSP development work, the OPA has

18 identified the transmission system need in southwestern Ontario and in particular for the

19 Bruce area. The OPA’s Analysis of Need and supporting information (collectively, “the

20 OPA Materials”) including a letter dated March 23, 2007 advising Hydro One to seek the

21 necessary approvals for a new 500kV line to increase the transmission transfer capability

22 from the Bruce to the GTA are attached in Exhibit B, Tab 6, Schedule 5. This Section 92

23 application relies on the OPA’s identification of need.

25 Hydro One concurs with the OPA’s determination that there is a need to increase the

26 long-term transmission capacity out of the Bruce area as quickly as possible. As

27 indicated in the OPA Materials, the present transmission system has the capability to

28 transmit about 5,000 MW of the generation from the Bruce area. Given the amount of Filed: March 29, 2007 EB-2007-0050 Exhibit B Tab 1 Schedule 3 Page 2 of 2

1 additional nuclear and wind generation capacity committed, the OPA estimates that the

2 total generation available will be about 5,800 MW by 2009, and 7,300 MW by 2012.

3 With the additional wind generation opportunities also identified by the OPA in the area,

4 the total generation in the area could reach 8,300 MW, for a shortfall in transmission

5 capacity of about 3,300 MW.

7 Given the expected shortfall between transmission capability and forecast available

8 generating capacity in the Bruce area, the OPA has determined that there is a need to

9 reinforce the transmission system out of the Bruce area as early as possible both to permit

10 full deployment of the committed generating resources and to enable the development of

11 potential new renewable energy resources in the Bruce area consistent with Government

12 policies and directives (see Exhibit B, Tab 6, Schedule 5, Appendices 8 to 12).

13 Filed: March 29, 2007 EB-2007-0050 Exhibit B Tab 1 Schedule 4 Page 1 of 1

1 EXISTING FACILITIES:

2 BRUCE X MILTON SCHEMATIC DIAGRAM

To Owen Sound TS

B27S B28S To Owen Sound TS

Bruce GS H 1 To Essa TS S Hanover TS B V 4V 9 B E 5V V

B 8 L E 2 3 2 6 D 5 B B

L 2

2 3

6 D

B5 D Orangeville TS 1 0 H

V 7 D B 5 V 6 6 0V D B 56 To Detweiler TS To Detweiler TS 1M To Longwood TS To Detweiler TS Milton SS Legend Transmission Lines Existing 500 kV Existing 230 kV Existing 115 kV 4 5 Filed: March 29, 2007 EB-2007-0050 Exhibit B Tab 1 Schedule 5 Page 1 of 1

1 EXISTING FACILITIES:

2 500 kV BRUCE A TS SCHEMATIC DIAGRAM

3 T25

A Bus

Longwood B562L LX3 G4

T28

BruceB Claireville B569B B560V LX9 LX7 G3

E Bus

T27

Legend:

G Generator 500 kV Circuit Breaker 500 kV Circuit Termination 500 kV Transformer Termination 4 5 Filed: March 29, 2007 EB-2007-0050 Exhibit B Tab 1 Schedule 6 Page 1 of 1

1 EXISTING FACILITIES:

2 500 kV BRUCE B SS SCHEMATIC DIAGRAM

P Bus

Milton G5 B561M G7 L04

Bruce A B569B Longwood L05 B563L G6 L02 G8

J Bus

Legend:

G Generator 500 kV Circuit Breaker 500 kV Circuit Termination

4 5 Filed: March 29, 2007 EB-2007-0050 Exhibit B Tab 1 Schedule 7 Page 1 of 1

1 EXISTING FACILITIES:

2 500 kV MILTON SS SCHEMATIC DIAGRAM

K Bus

Bruce B SS Claireville TS Trafalgar TS B561M M570V M572T

Claireville TS M571V

Trafalgar TS Middleport TS M573T M585M

H Bus

Legend:

G Generator 500 kV Circuit Breaker 500 kV Circuit Termination

3 4