AESO Export Capability Workshop

February 16, 2006

Metropolitan Centre, Calgary

AB to BC Transfer BCTC perspective

Calgary, Alberta - Feb 16, 2006

Feb. 16, 2006 Page 3

The BC Transmission System

Snapshot:• 18,000 km circuit transmission

lines• 287 switching, distribution and

capacitor stations• Control Centers

• 1 System Control Center• 4 Area Control Centers

• 244 microwave and repeater sites

• Transmission rights-of-way• Interconnected to Alberta and

the Pacific Northwest for over three decades

Feb. 16, 2006 Page 5

BCTC Bulk Transmission System Overview (export to US)

NICSEL

KLY

REV

WSN

MCA

CBK

ACK

VAS

GMS/PCN

LM & VI

SEL area gen

5L925L94

5L91

5L965L98

5L81 & 5L82

5L51 & 5L52

5L875L76 & 5L79

2L112

BPA

Feb. 16, 2006 Page 6

BCTC Bulk Transmission System Overview(import from US)

NICSEL

KLY

REV

WSN

MCA

CBK

ACK

VAS

GMS/PCN

LM & VI

SEL area gen

5L925L94

5L91

5L965L98

5L81 & 5L82

5L51 & 5L52

5L875L76 & 5L79

2L112

BPA

Feb. 16, 2006 Page 7

Transmission Line Forced Outage (3 pole) Approx Data

Notes:1. SPR provided

in late 2002

2. SPR provided in mid 2003

3. SPR to be provided in 2006

4. SPR provided in 2005

5. Include sequential ctgs in less than 5 minutes

6. * SPR provided

500kV LinesCircuit Length

(km)3 Phase forced

outages Data Years

Forced outage per

year

5L76 (note 1 ) 118 65 22 2.98

5L79 (note 2) 118 70 21 3.35

5L81 * 264 55 22 2.52

5L82 * 248 62 22 2.84

5L91 (note 3) 223 181 22 8.29

5L92 * 180 62 22 2.84

5L94 * 319 146 20 7.30

5L98 (note 4) 302 381 22 17.45

5L51 & 5L52 36 / 36 1 22 0.05

5L91 & 5L98   3 (note 5) 22 0.14

5L76 & 5L79   4 22 0.18

5L81 & 5L82   3 22 0.14

5L1/2/3/4/7 double contingencies approx 278 14 22 0.64

5L11/12/13 double contingencies approx 330 12 22 0.55

Feb. 16, 2006 Page 8

BCTC RAS

• RAS arms generation shedding, line tripping, reactive equipment switching, and calculates transfer limits

• RAS armed in real time dynamically

• RAS arming based on actual flows

• TSA runs every 4 minutes

• TSA arms RAS

• RAS armed automatically

Feb. 16, 2006 Page 9

Feb. 16, 2006 Page 10

Questions?