_____

From: Annis, Kristyn [mailto:kannis@mccarthy.ca]
Sent: March 22, 2012 10:51 AM
To: BoardSec
Cc: Babar Khan; James Carter; Nabih Mikhail; Kristi Sebalj; Vegh, George
Subject: EB-2011-0420 - Responses from Hydro One Networks Inc.



Dear Ms. Walli,



Further to interrogatory #7 posed by Board Staff, please find below the responses from Hydro One Networks Inc.



Yours truly,



McCarthy Tétrault

Kristyn Annis
Partner
T: 416-601-7624
F: 416-868-0673

McCarthy Tétrault LLP
Box 48, Suite 5300
Toronto Dominion Bank Tower
Toronto ON M5K 1E6

PLEASE, think of the environment before printing this message.







From: Pedro Rojas <pedro.rojas@regionalpower.com>
Date: Wed, 21 Mar 2012 15:49:35 -0400
To: Babar Khan <babark@regionalpower.com>, James Carter <jamesc@regionalpower.com>
Cc: Nick Dhillon <nick.dhillon@regionalpower.com>
Subject: FW: White River - OEB Questionnire (Hydro One - Urgent)



James, Babar,

Please see email below with the responses from HONI to the OEB questions.



Please let me know if you need something else.



Regards,

Pedro



From: Khurram.Makhdoom@HydroOne.com [mailto:Khurram.Makhdoom@HydroOne.com]
Sent: Wednesday, March 21, 2012 3:20 PM
To: Pedro Rojas
Cc: ibrahim.el-nahas@HydroOne.com; john.sabiston@HydroOne.com; mike.ritchie@hydroone.com; Khurram.Makhdoom@HydroOne.com; Nick Dhillon
Subject: FW: White River - OEB Questionnire (Hydro One - Urgent)



Hi Pedro,

Please see our below responses to interrogatory #7 in the attached OEB document as per your request below. For sake of clarity, I have copied the excerpts in you below email and have embedded responses in ‘blue’.



Interrogatory 7

Reference:

(a) Exh. B/Tab 4/Sch. 3- CIA report/p. 11/first paragraph

(b) Exh. B/Tab 4/Sch. 3- CIA report/p. 10/Table 2 and Table 3



Preamble:

At the noted Reference (a) above, it is stated that:

The results of the fault levels studies shown on these tables above show

that the impact of the GAN and GAB projects does not have a measurable

(>=0.01kA) impact at the fault level at any of the stations ( Windsor Walker

#1, Kingsville or Martindale) where mitigation measures are necessary to

limit fault levels to acceptable values.



The statement was included in the CIA in order to compare the White River project to other projects where as a result of short-circuit level impacts, customer-funded upgrades have been required to be installed at several stations, including Windsor Walker #1 TS, Kingsville TS and Martindale TS. These upgrades were installed as a result of specific generation projects and the proponents of those projects were required to fund these upgrades. The statement in the CIA shows that the proponent for the GAN and GAB projects will not be required to co-fund any upgrades because the short-circuit impacts are within acceptable tolerances.



At Reference (b) on page 10, Table 2: Present Short-Circuit Levels and Table 3; Short

Circuit Levels after Incorporating GAN and GAB Projects, indicates that there was an

unintended error since the impact at the various stations range between zero for various

Bus locations and 0.9 kA (Hemlo Mine Jct for LG Assymetrical Faults) which represents

approximately 50% increase over the base of 1.8 kA.



Our above statement in the last paragraph of page 10 in Customer Impact Assessment is correct, although at Hemlo Mine Jct. the short circuit levels have increased from 1.8 kA to 2.7 kA which is an increase of 50%. The increase in short circuit levels in absolute value and compaired to the TSC limit of 50 kA is small and insignificant.



There also appears to be an error in the Stations listed at Reference (a), where it states

in part that:

[...] at the fault level at any of the stations ( Windsor Walker #1, Kingsville or

Martindale) where mitigation measures are necessary to limit fault levels to

acceptable values.

Question/Clarification:

(i) Please correct the noted errors in the summary of the short-circuit impact

assessment related to the 12 Bus locations listed at Reference (b), Table 3.”



Please see the respone above with respect to Reference (a). As noted there, the reference to Windsor Walker #1 TS , Kingsville TS and Martindale TS was made for comparison purposes. It was not intended to imply that those stations are affected by the White River project, as those stations are too far from the proposed project to be affected. As such, it is not expected that there will be any change in the short circuit levels at these stations due to this project connecting to the Hydro One system. The reference to the short-circuit tables in Page 11 (Reference A) is accordingly due to a a clerical error and will be removed.



If you need further clarification, please feel free to call me at any time.



Best Regards,



Khurram Makhdoom

Transmission System Development Division

Hydro One Networks

15th Floor, 483 Bay Street , Toronto

(416) 345 - 5374







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