May 13, 2010 Alberta Utilities Commission Attention: Don Popowich

May 13, 2010
Alberta Utilities Commission
Attention: Don Popowich
Director of Facilities
Fifth Avenue Place
4th Floor, 425 - 1 Street SW
Calgary, AB T2P 3L8
Dear Mr. Popowich:
Re: Application to the Alberta Utilities Commission (AUC) for approval of the ENMAX
No. 24 Substation Transformer Capacity Upgrade Needs Identification Document
Please find enclosed the AESO application for approval of the Needs Identification Document
for the proposed ENMAX No. 24 Substation Transformer Capacity Upgrade pursuant to section
34(1)(c) of the Electric Utilities Act.
Please do not hesitate to contact either of the individuals below if you have questions or concerns
regarding the foregoing:
Jennifer Hocking
Regulatory Legal Counsel
[email protected]
403-539-2578
Deanna Merrick
NID Filings Coordinator
[email protected]
403-539-2563
Yours truly,
<filed electronically>
Jennifer Hocking
Regulatory Legal Counsel
2500, 330 - 5th Ave SW Calgary, Alberta T2P 0L4
t (403) 539-2450 | f (403) 539-2949 | www.aeso.ca
Alberta Utilities Commission
In the Matter of the ENMAX No. 24 Substation Transformer
Capacity Upgrade
And in the matter of the Electric Utilities Act, S.A. 2003, c. E-5.1,
the Alberta Utilities Commission Act, S.A. 2007, c. A-31.2, the
Hydro and Electric Energy Act, R.S.A. 2000, c. H-16, the
Transmission Regulation, AR 86/2007 and Alberta Utilities
Commission Rule 007, all as amended
Application of the Alberta Electric System Operator for
approval of the Needs Identification Document for the ENMAX
No. 24 Substation Transformer Capacity Upgrade
Application No. ______________
ENMAX No. 24 Substation Transformer Capacity Upgrade Needs Identification
Document
PART A - APPLICATION
1 Introduction
1.1
Pursuant to section 34(1)(c) of the Electric Utilities Act (EUA) and in accordance
with the further legislative provisions set out in the recitals, the Alberta Electric System
Operator (AESO) applies to the Alberta Utilities Commission (Commission) for approval
of the ENMAX No. 24 Substation Transformer Capacity Upgrade Needs Identification
Document (NID), as more specifically described herein.
1.2
This NID has been prepared in response to the request by ENMAX Power
Distribution (the Distribution Facility Owner, or DFO) for an increase in 25kV capacity at
the ENMAX No. 24 Substation located in the southeast section of Calgary. Service is
requested commencing October 1, 2011. This NID describes the need to respond to the
DFO’s request and demonstrates that the manner in which capacity is proposed to be
increased is consistent with AESO’s responsibilities to plan the transmission system to
provide efficient, reliable and non-discriminatory system access service and arrange for
the
timely
implementation
of
required
transmission
system
expansions
and
enhancements, all in the public interest.
1.3
In the process of establishing need and preparing the NID, the AESO has given
various directions to the incumbent transmission facility owner, ENMAX Power
Transmission (TFO), including, pursuant to subsection 35(1) of the EUA, to prepare a
transmission facility proposal (commonly known as a Facilities Application or FA) to
meet the need identified. As per Section 14(1) of the Transmission Regulation (TReg),
the AESO has relied on work conducted by the TFO to prepare this application.1
1
This NID is directed solely to the question of the need for expansion or enhancement of the capability of the
transmission system. Any reference to existing Customers or other parties and/or the facilities they may, or may wish
to, own and operate is not intended to associate this NID with any other application for regulatory or other approval
that are the responsibility of such Customer or other party.
Alberta Electric System Operator
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April 28, 2010
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2 Need Identification Overview
2.1
The AESO, pursuant to its responsibilities under section 29 of the EUA, must
provide system access service on the transmission system in a manner that gives
market participants a reasonable opportunity to exchange electricity. The market
participant, the DFO in this case, has determined that the addition of 138-25 kV
transformation capacity is required to serve forecasted distribution system load growth
as early as 2010, and has requested that the AESO arrange for the appropriate
transmission expansion. Consistent with its responsibilities, the AESO directed the TFO
to propose the manner in which the DFO’s request for service could be met.
2.2
The TFO proposal to meet the DFO requirements involves the addition of a
second transformer at the ENMAX No. 24 Substation, which is a point of
interconnection between the higher voltage transmission system and the lower voltage
distribution system.
2.3
The proposed transformer addition includes the addition of a new 138-25 kV 50
MVA transformer at the No. 24 Substation, a 138 kV bus tie breaker, and associated
switchgear equipped with protection and controls, and related equipment as will be
more specifically described in the TFO’s FA and/or determined as detailed engineering
progresses and DFO operating requirements are finalized. The AESO also notes that
distribution feeders and any other distribution facilities that are to be subsequently
connected to the ENMAX No. 24 Substation are the responsibility of the DFO and are
not included in this application.
2.4
The AESO notes that the ENMAX No. 24 Substation has been previously
constructed to accommodate additional transformers such as is proposed, and that the
proposed transformer addition and related development would take place within the
existing fence boundaries, thereby minimizing the potential for environmental, visual
and noise effects.
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April 28, 2010
ENMAX No. 24 Substation Transformer Capacity Upgrade Needs Identification
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2.5
The capital cost of the proposed transformer addition and related equipment is
estimated by the TFO to be $5.8 Million ($2010, +20/-10%). The AESO has conducted
appropriate studies and determined that facilities totaling approximately $5.7 Million are
consistent with the AESO’s standard facilities definition and therefore qualify for AESO
investment under its customer contribution policy, with the remainder not eligible for
AESO investment.
2.6
Consistent with its local load growth forecast, the DFO has committed to
increasing its Demand for Transmission Service (DTS) contract for Substation No. 24 by
33 MW, to a total of 51 MW, upon energization of the proposed transformer addition.
2.7
The AESO directed the TFO to conduct a Participant Involvement Program (PIP),
on its behalf, in accordance with AUC Rule 007, NID 13. The TFO, with assistance from
the AESO, utilized various methods to notify stakeholders of the potential for
transmission development at the ENMAX No. 24 Substation. During and after the PIP
conducted through November of 2009 the AESO has received no indication of concern
from any party regarding the need for the proposed transformer addition.
2.8
The AESO has assessed the integration of the proposed transformer addition
into the transmission system and has determined that there will be no additional system
work specifically required in order to connect and operate the transformer as proposed.
However, it is noted that transmission system constraints presently exist in the area of
southeast Calgary and that the AESO is developing plans to alleviate those constraints.
The addition of the proposed transformer at No. 24 Substation in the manner indicated
will not affect these forthcoming plans. The proposed alternative is consistent with other
planned system enhancements in the immediate vicinity and beyond, including the
development of critical bulk system reinforcements planned across the province.
2.9
The AESO notes that until system reinforcements to the transmission system in
the area southeast of Calgary are completed, a remedial action scheme (RAS) may limit
the firm capacity of ENMAX No. 24 until such time as system constraints have been
alleviated. The AESO currently anticipates that these constraints will be removed as
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April 28, 2010
ENMAX No. 24 Substation Transformer Capacity Upgrade Needs Identification
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early as 2012/13, however specific timing remains uncertain. The DFO has been made
aware of the constraints that may apply to the operation of the proposed transformer
addition and the DTS contract entered into will specify the nature of the constraints.
2.10
Giving consideration to section 29 of the TReg, information obtained from
consultations, the fact that the proposed facilities are to be developed within the fenceline of the existing substation, estimated costs, and system studies undertaken by the
AESO, it is the conclusion of the AESO that the transformer addition proposed by the
TFO meets the identified need and the DFO’s requirements in a manner that is
reasonable, and is consistent with the AESO’s duties to plan for the transmission
system to provide efficient, reliable and non-discriminatory system access service and
the
timely
implementation
of
required
transmission
system
expansions
and
enhancements. The proposed transformer addition is therefore the AESO’s preferred
option for the meeting the identified need. As such, the AESO believes the approval of
the NID is also in the public interest.
3 Request to Combine NID and Facilities Application for
Consideration in a Single Process
3.1
The AESO understands that the TFO’s FA noted in paragraph 1.3 above will be
filed shortly. Given the relatively simple scope of the proposed development, and as
contemplated by section 15.4 of the Hydro and Electric Energy Act and section 6 of
Commission Rule 007, the AESO requests, and expects the TFO will also request, that
the NID be combined with the FA for consideration by the Commission in a single
process. An evident advantage of doing so will be to enable the Commission to consider
factors and information in the FA that are relevant to the issue of need.
3.2
The AESO believes that the NID and the FA will be materially consistent and
requests that in its consideration of both, the Commission be mindful of the fact that the
two documents have been prepared separately and for different purposes. The purpose
of the NID is to obtain approval for the identified need and, at an overview level, provide
Alberta Electric System Operator
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April 28, 2010
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PART B – NID BACKGROUND AND SUPPORTING INFORMATION
1.
The AESO is responsible for the safe, reliable, and economic operation of the
Alberta Interconnected Electric System (AIES) and for the promotion of a fair, efficient
and openly competitive market for electricity in Alberta2. As directed by the EUA, the
AESO must forecast transmission needs for Alberta and develop plans for the
transmission system to provide efficient, reliable and non-discriminatory system access
service and the timely implementation of required transmission system expansions and
enhancements3. Part 2 of the TReg further defines the AESO’s transmission planning
duties and responsibilities. Part 3 of the TReg directs the AESO to comply with, adopt,
develop, and maintain the transmission system reliability standards, agreements,
criteria and directives necessary to the execution of its duties.
2.
As noted in section 2.1 of Part A, the AESO must provide system access service
on the transmission system in a manner that gives market participants a reasonable
opportunity to exchange electricity. Where, as in this case, the market participant is
requesting the expansion or enhancement of the capability of the transmission system,
the AESO must prepare and submit for Commission approval, a NID that describes: the
need to respond to the DFO’s request and the assessments conducted by the AESO
regarding the manner proposed to address that need.
3.
Pursuant to subsection 35(1) of the EUA, the AESO directs the TFO in whose
service territory the need is located to prepare a FA to meet the need identified.
The
FA is also submitted to the Commission for approval. As noted in section 3.1 of Part A,
such a direction has been given to the TFO in this case.
2
EUA, section 16.
3
EUA, section 33
Alberta Electric System Operator
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April 28, 2010
ENMAX No. 24 Substation Transformer Capacity Upgrade Needs Identification
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4.
The remainder of this NID provides supporting information concerning the
identified need. Appendix A contains an estimate of the capital costs for the proposed
transformer addition, prepared by the TFO. The accuracy of the estimated capital costs
is +20/-10%, which exceeds the accuracy required by AUC Rule 007, NID 10. Since,
this project is required to meet the load growth in southeast Calgary, this project is
eligible for AESO investment and a portion of the costs are indicated as costs for the
account of the DFO. It is noted that these cost estimates may differ from those which
will form part of the FA.
5.
Appendix B contains a summary of the Participant Involvement Program (PIP)
activities conducted regarding the ENMAX No. 24 transformer addition; a summary of
PIP results is also included. Copies of the relevant materials distributed during the PIP
are attached for reference.
6.
For information, the Interconnection Proposal (IP) prepared by the TFO in
December 2008 is included for reference in Appendix C. The IP contains the DFO’s
Statement of Need and provides information regarding the need for increased
transformation capacity in the southeast corner of Calgary. The IP is the basis for the
DFO’s request to the AESO for transmission enhancements and the TFO’s proposed
method of addressing the request. It is noted however, that while the IP was prepared
some time ago, there have been no significant changes to the transmission system
around ENMAX No. 24 Substation that would change the need for this development. In
addition, ENMAX Power Corporation has provided a letter to the AESO dated April 14,
2010 confirming that its needs have not changed in terms of load requirements and
verifying its choice of preferred alternative. A copy of the letter is provided for reference
in Appendix C, along with updated capital cost estimates for the alternatives considered,
escalated to $2010. Furthermore, the AESO and DFO have prepared the appropriate
contractual arrangements necessary to proceed with the proposed development upon
receipt of appropriate approvals. These arrangements indicate a commitment on behalf
of the DFO to proceed with the proposed development as described herein.
Alberta Electric System Operator
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April 28, 2010
ENMAX No. 24 Substation Transformer Capacity Upgrade Needs Identification
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Appendices
Appendix A – Capital Cost Estimate for the Proposed Transformer Addition
Appendix B – Participant Involvement Program (PIP) Summary and Materials
Appendix C – TFO Interconnection Proposal and Update Letter
Alberta Electric System Operator
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April 28, 2010
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Appendix A: Capital Cost Estimate for Proposed
Transformer Addition
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Appendix B: Participant Involvement Program (PIP)
1.0
PARTICIPANT INVOLVEMENT PROGRAM
During November, 2009, the AESO conducted a Participant Involvement Program in
conjunction with the development of its Needs Identification Document (NID) to address
the need for transmission development to install an additional 138/25 kV – 50 MVA
transformer in the ENMAX No. 24 substation located in southeast Calgary.
The incumbent TFO assisted the AESO in consulting on the need for this transmission
development by mailing a project specific information package to all occupants,
residents and landowners within an 800 metre radius of the planned development, and
as well to industry representatives and agencies with interests in the area. This package
included the AESO’s need overview.
The AESO’s PIP was designed to notify, provide information and consult, as necessary,
with the parties noted in the prior paragraph, and included the following municipalities
and businesses:
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764944 Alberta ltd.
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R. Sidj Holdings Ltd.
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R. Z. Holdings Ltd.
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The City of Calgary
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Allen Sons Recycling
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Procoat Paintings
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AM Jade Co.
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Calgary Tunnelling Horizontal Augering Ltd.
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Westcan Recyclers
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Canadian Pacific
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Chief Construction
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Electrolux
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CV Portable Accommodations
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Big 4 Container Services
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RIMK Industries Inc.
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Sherwood Steel
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JW Fleet Services
-1-
The AESO used a variety of methods to notify stakeholders about the need for this
transmission development in southeast Calgary. Information and an overview
concerning the need for the proposed development were:
(a) Posted on the AESO’s website (Attachment 1);
(b) Included in a mail out by the incumbent TFO in November, 2009, directly addressed
to all stakeholders within 800 metres of the proposed development (Attachment 2);
(c) Most recently published in the Calgary Herald on April 29, 2010. (Attachment 3).
In distributing this information to stakeholders, the TFO was prepared to direct enquiries
about the need for this project to the AESO; likewise, the AESO planned to direct
facilities-related enquires to the TFO.
1.1
Description of Participant Involvement Program
AESO Need Overview
The AESO developed an overview document that describes the need for transmission
development in southeast Calgary to increase the capacity at No 24 Substation, located
at 9905 – 68 Street SE, in order to support the growing electrical needs of the
community. This Need Overview also provided a description of the AESO and its
responsibilities and encouraged stakeholders to contact the AESO by phone, email or
mail if they had any questions or concerns about the need for the planned transmission
reinforcement. A copy of this document was posted to the AESO website at
http://www.aeso.ca/downloads/need_overview_se_calgary.pdf.
Stakeholder Communication Tools
In addition to the PIP activities described above, the AESO also provided stakeholders
with a dedicated, toll-free telephone line (1-888-866-2959) and a dedicated email
address ([email protected]). the AESO’s contact information, along with
the AESO’s mailing address, (2500, 330 5th Ave, SW, Calgary), website address
(www.aeso.ca) and privacy statement describing how the AESO honours Alberta’s
Personal Information Protection Act, was included on all AESO communication related to
this application.
-2-
1.2
Issues and Concerns Raised and the AESO’s Responses
The AESO has received no indication of concern from any party about the need for
transmission development to increase the capacity at No 24 Substation in southeast
Calgary.
-3-
Need for transmission system reinforcement in East
Calgary
For more information please contact the AESO at 1-888-866-2959,
www.aeso.ca or [email protected]
Why is transmission system reinforcement needed in East Calgary?
Demand for electricity in East Calgary continues to grow and transmission system reinforcements
to help meet this demand are required. The Alberta Electric System Operator (AESO) has verified
the need for transmission system reinforcement in East Calgary and has confirmed that electricity
demand in this area can be reliably met by installing an additional 138/25 kV – 50 MVA
transformer in the ENMAX No. 24 substation.
Who is the AESO?
Alberta’s transmission system, sometimes referred to as the Alberta Interconnected Electric
System
(AIES) or “grid”, is planned and operated by the Alberta Electric System Operator (AESO). The
transmission system is comprised of the high-voltage lines, towers and equipment (generally 69
kV and above) that transmit electricity from generators to lower voltage systems that distribute it
to cities, towns, rural areas and large industrial customers. Our job is to maintain safe, reliable
and economic operation of the provincial transmission grid. Our planning responsibility includes
identifying needed transmission reinforcement and recommending preferred options to meet
these needs. We are regulated by the Alberta Utilities Commission (AUC) and must apply for
approval of the transmission system needs we identify. Further, the AESO is also mandated to
facilitate the interconnection of qualified electricity generators and new load customers to the
provincial transmission grid.
The AESO intends to apply to the AUC for approval of the need identified for transmission
reinforcement in East Calgary area in March 2010.
How is ENMAX Power Corporation involved?
ENMAX Power Corporation. is the Transmission Facility Owner (TFO) in the Calgary Area. While
the AESO is responsible for determining the need for transmission system reinforcement,
ENMAX, when directed by the AESO, is responsible for filing an application with the AUC for
approval of the transmission facilities that will satisfy the transmission system reinforcement need
identified by the AESO.
The AESO appreciates the views of stakeholders. Your comments and suggestions on the plan
for transmission system reinforcement are encouraged. If you have any questions or suggestions
regarding the need for transmission system reinforcement in East Calgary or the AESO’s
application regarding this need, please contact:
Matt Gray
AESO Stakeholder Relations
1-888-866-2959
[email protected]
2500, 330 – 5th Avenue SW
Calgary, Alberta T2P 0L4
The AESO is committed to protecting your personal privacy in accordance with Alberta's Personal
Information Protection Act. Any personal information collected by the AESO with regard to this
project may be used to provide you with further information about the project, may be disclosed to
the Alberta Utilities Commission (and as a result, may become public), and may also be disclosed
to the local Transmission Facility Owner. If you have any questions about how the AESO will use
and disclose your personal information collected with regard to this project, please contact us at
888-866-2959 or at [email protected].
Stakeholder Newsletter | October, 2009
ENMAX
No. 24 Substation
Proposed Capacity
Upgrade Project
To support the growing electrical
needs of the community, ENMAX
Power Corporation (ENMAX Power)
and the Alberta Electric System
Operator (AESO) are proposing to
increase the capacity at ENMAX
No. 24 Substation, located at 9905
– 68 Street SE. We are committed
to working with stakeholders and
community members to share
information, gather input, and
address questions you may have.
The Regulatory Process and the Industry Partners
ENMAX Power and the AESO have been working together to determine the necessary system upgrades required to
continue providing reliable power supply to this area of the city.
Before upgrades to the electrical system can take place, the AESO must submit a Needs Identification Document
outlining their recommendation for system upgrades to the Alberta Utilities Commission (AUC) for review and approval.
If they receive approval, the AESO directs the Transmission Facility Owner (in this case ENMAX Power) to develop a
Facilities Application which outlines what changes or additions are occurring with the transmission infrastructure. This
application is also provided to the AUC for review and approval.
Public consultation is a key component in the development of both the Needs and Facility Applications.
Project Overview
Additional Information
The No. 24 Substation Project includes the installation of an additional 138-25 kiloVolt (kV) 50 MVA
transformer and associated switchgear, and one 138 kV bus tie breaker with associated protection and
controls at the substation site. All of this work will take place inside the existing substation fence.
The AESO and ENMAX Power invite your
comments about this project.
If you have any comments or concerns,
or require additional information,
please contact us at (403) 514-1341,
[email protected], or write to:
Transmission Planning and Design
ENMAX Power Corporation
141 – 50 Avenue SE
Calgary, AB T2G 4S7
Correspondence will be received up to
4:00 pm on February 12, 2010.
For more information about the need for this
project, please visit www.aeso.ca
or contact the AESO at 1-888-866-2959 or
[email protected].
Commitment to
Community
Project Background
Glenmore Trail SE
84 St SE
68 St SE
86 Ave SE
90 Ave SE
52 St SE
94 Ave SE
Shepard Rd
ENMAX
No. 24
Substation
As part of this public consultation process, the AESO and
ENMAX Power will be holding an Open House regarding the
proposed project. Representatives will be on hand to provide
more information about the project and why it’s needed, and to
hear your concerns and respond to any questions you may have.
When: Thursday November 26th, 2009
Where: Glenmore Inn – Mcleod Room
2720 Glenmore Trail SE
Time: 3 p.m. to 7 p.m.
Proposed Additions
This area of Calgary has been experiencing
rapid growth, particularly in the commercial
and industrial segment, and more
development is planned. This growth results
in increasing demand on the electrical system.
The addition of this equipment will increase
the overall capacity of the substation and
enable ENMAX Power to continue to provide
reliable electrical services to meet the needs
of residents and other electricity customers in
this area of the city.
Project Open House
Proposed Project Schedule
This project requires regulatory approval by the AUC. The AESO and ENMAX Power expect to file their
respective applications with the AUC by March 2010, following completion of the initial stakeholder
consultation process. If the proposed project is approved, ENMAX Power anticipates construction to take
place beginning in October 2010 with project completion by April 2011.
Stakeholder Newsletter | October, 2009
ENMAX Power is committed to being
an excellent corporate neighbour in the
community and providing timely and
meaningful consultation with stakeholders
about this proposed project. ENMAX
Power will work in a collaborative and
respectful manner to share information
about the proposed No. 24 Substation
project and respond to stakeholder
questions and concerns.
A comprehensive public consultation
program has been developed to provide
opportunities for area residents, occupants
and interested parties to engage ENMAX
Power’s project team from planning
through construction and operations.
About the AESO
The Alberta Interconnected Electric System (AIES), our
province’s electricity transmission system or “grid”,
is planned and operated by the AESO. This network
of higher-voltage transmission lines, towers and equipment carries or transmits
electricity from generators to large industrial customers as well as lower-voltage
systems that distribute it to cities, towns and rural areas. Our job is to maintain safe,
reliable and economic operations on the provincial transmission grid.
About ENMAX Power
ENMAX Power, a subsidiary of ENMAX Corporation, and
its predecessors have provided Albertans with safe and
reliable electricity for more than 100 years. One of the most reliable urban utilities in
Canada, ENMAX Power owns, operates and maintains the distribution and much of
the transmission network in and around Calgary. Most of ENMAX Power’s activities
are regulated by the AUC. The non-regulated subsidiaries managed by ENMAX Power
provide engineering, procurement, construction and maintenance for the electrical
servicing of residential and commercial developments and light rail transit systems
as well as fiber optic networks for high speed data and internet communications. For
more information, visit our website at www.enmaxpower.com.
The AESO is committed to protecting your personal privacy in accordance with Alberta’s Personal Information Protection Act. Any personal information collected by the AESO with regard
to this project may be used to provide you with further information about the project, may be disclosed to the AUC (and as a result, may become public), and may also be disclosed to the
eligible Transmission Facility Owner. If you have any questions about how the AESO will use and disclose your personal information collected with regard to this project, please contact us
at 1. 888.866.2959 or at [email protected].
When you choose to share personal information with any of the ENMAX group of companies, we consider this information confidential. ENMAX and its affiliates or agents will not sell or
trade your information to any third parties. ENMAX will only use this information for the purpose of planning, building, or maintaining the transmission project for which your information
was collected, and will only share your information with parties who reasonably require the information for that purpose. Such parties may include other industry participants, such as the
AUC, AESO, other electric facility owners, or other industry participants involved in the development of the project. If you have any concerns about how your information will be used, or
any questions regarding our Personal Information Commitment, please contact ENMAX, or visit us at http://www.enmax.com/Corporation/Web+Help/Legal/Privacy+Commitment.htm.
Stakeholder Newsletter | October, 2009
Stakeholder Newsletter | October, 2009
ENMAX
No. 24 Substation
Proposed Capacity
Upgrade Project
To support the growing electrical needs of the community, ENMAX
Power Corporation (ENMAX Power) and the Alberta Electric System
Operator (AESO) are proposing to increase the capacity at ENMAX
No. 24 Substation, located at 9905 – 68 Street SE. We are committed
to working with stakeholders and community members to share
information, gather input, and address questions you may have.
For more information, please review the enclosed detail, or join us at our
Open House on November 26 at the Glenmore Inn – Mcleod Room.
Stakeholder Newsletter | October, 2009
Notification of Regulatory Filing for Transmission
System Reinforcement in the East Calgary Area
The Alberta Electric System Operator (AESO) has identified a need to reinforce a section of the transmission
system in the East Calgary area. The AESO advises you of its intention to ask the Alberta Utilities
Commission (Commission) to approve this need, in the form of a Needs Identification Document (NID) that it
will file with the Commission.
The map above shows the proposed area for transmission development in the East Calgary
area. The AESO has identified the need to install an additional 138/25 kV – 50 MVA
transformer in the ENMAX No. 24 substation.
The AESO and ENMAX Power Corporation (ENMAX) presented this need to residents near the proposed
site and other stakeholders during November and December 2009. The AESO has considered feedback
gathered from stakeholders, and technical and cost considerations, and will apply to the Commission
for approval of the need for this project. The AESO intends to file its application on or after May 13,
2010. Please visit our web site, www.aeso.ca for more information, or contact the AESO at 1-888-8662959 or [email protected]. A copy of this application is available for download at
http://www.aeso.ca/transmission/20535.html
In a separate application, ENMAX will apply to the Commission for approval to construct and operate
the specific facilities to meet the identified need.
The AESO is committed to protecting your personal privacy in accordance with Alberta's Personal Information
Protection Act. Any personal information collected by the AESO with regard to this project may be used to provide
you with further information about the project, may be disclosed to the Alberta Utilities Commission (and as a result,
may become public), and may also be disclosed to the eligible Transmission Facility Owner(s). If you have any
questions about how the AESO will use and disclose your personal information collected with regard to this project,
please contact us at 1-888-866-2959 or at [email protected].
Artist:
2N
P r o d u c t i o n
Docket: 103086
Date: Apr 22, 2010
Size: 6.25”
Proof:
1
1A of 1
Publication(s):
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Appendix C: TFO Interconnection Proposal and Update
Letter
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!"#$%$&'()&*)+,-.-/)
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Interconnection Proposal
For Transformer Capacity Upgrades
At ENMAX No. 24 Substation
Signature
Name
Prepared:
Simon Chan,
TFO
E.I.T.
Reviewed:
Shiv Kumar,
P.Eng.
Projects
Todd Driediger,
Reviewed:
System Operations P.Enq.
Michael Andrusiw,
Reviewed:
P.Eng.
DFO
Mark Apuzzo,
Reviewed:
P. Eng.
Protection
Approved:
Brent Thesen,
P.Eng.
TFO
APEGGA Permit to Practice B6756
December 08, 2008
Version: 1
Date
Interconnection Proposal for Transformation Capacity Upgrade at ENMAX No. 24 Substation
Table of Contents
1.0
PROJECT DESCRIPTION ............................................................................................. 3
2.0
EXECUTIVE SUMMARY................................................................................................ 3
3.0
NEED FOR DEVELOPMENT......................................................................................... 4
4.0
EXISTING SYSTEM....................................................................................................... 4
4.1
4.2
4.3
4.4
5.0
PROPOSED DEVELOPMENT ....................................................................................... 7
5.1
6.0
GEOGRAPHIC AREA....................................................................................... 4
STUDY CRTIERIA ............................................................................................ 5
AREA LOAD FORECAST................................................................................. 5
DETAILED LOAD FORECAST FOR DISTRIBUTION (25 KV) SYSTEM......... 6
TRANSMISSION DEVELOPMENT................................................................... 7
TRANSMISSION ALTERNATIVES ................................................................................ 7
6.1
6.2
ALTERNATIVES CONSIDERED ...................................................................... 7
COMPARISON OF ALTERNATIVES................................................................ 9
7.0
CURRENT PROJECTS................................................................................................ 10
8.0
FUTURE CONSIDERATIONS...................................................................................... 10
9.0
TRANSMISSION CONSTRUCTION SCHEDULE........................................................ 11
APPENDIX A - STATEMENT OF NEED ............................................................................... 12
APPENDIX B – EXISTING TRANSMISSION CONFIGURATION ......................................... 26
APPENDIX C – EXISTING SUBSTATION CONFIGURATION ............................................. 28
APPENDIX D – PROPOSED TRANSMISSION ALTERNATIVES......................................... 31
1
Interconnection Proposal for Transformation Capacity Upgrade at ENMAX No. 24 Substation
List of Tables
Table 4.3-1
Peak Load Forecast for ENMAX No. 24, No. 26 and No. 37 Substations (25
kV Distribution System Only) ............................................................................................. 5
Table 4.4-1
Peak Load Forecast for ENMAX No. 24, No. 26 and No. 37 Substations (25
KV Distribution System Only)............................................................................................. 6
Table 6.2-1
Capital Cost to Implement Alternatives ............................................................ 9
Table 6.2-1
Capital Cost to Implement Alternatives, continued ........................................ 10
List of Figures
Figure B-1 Calgary Area Transmission System.................................................................. 27
Figure C-1 No. 24 Substation Single Line Diagram ............................................................ 29
Figure C-2 No. 37 Substation Single Line Diagram ............................................................ 30
Figure D-1 Transmission Alternative A (Preferred) – Install Transformer at No. 24
Substation with Bus Tie Breaker...................................................................................... 32
Figure D-2 Transmission Alternative B – Install Transformer at No. 24 Substation without
Bus Tie Breaker ............................................................................................................... 33
Figure D-3 Transmission Alternative C – Install Two Transformers at No. 37 Substation (1
of 2)……. ......................................................................................................................... 34
Figure D-4 Transmission Alternative C – Install Two Transformers at No. 37 Substation (2
of 2)……. ......................................................................................................................... 35
2
Interconnection Proposal for Transformation Capacity Upgrade at ENMAX No. 24 Substation
1.0
PROJECT DESCRIPTION
ENMAX Power Distribution (DFO) has requested increased system capacity originating at
ENMAX Power Transmission (TFO) ENMAX No. 24 Substation. Currently, the load east of
ENMAX No. 24 Substation in the ENMAX service area is not supplied within acceptable
ENMAX Standards of Service. Refer to the Statement of Need provided by ENMAX Power
Distribution (DFO) in Appendix A.
ENMAX Power Transmission hereby proposes the installation of one 30/40/50 MVA 138 kV25 kV transformer and the associated switchgear at ENMAX No. 24 Substation to meet the
DFO need.
2.0
EXECUTIVE SUMMARY
Due to the increased commercial, industrial and large customer load currently supplied from
ENMAX No. 24 Substation, this substation is projected to have insufficient transformation
capacity to supply the forecasted load by winter 2010. Additionally, there will be 19 MVA load
at risk with the loss of 24.1TR by the summer of 2009. To address the load growth in this
area, the DFO has requested a capacity upgrade at ENMAX No. 24 Substation. Several
alternatives were examined with consideration given to current distribution load, future load
growth and associated costs of each alternative. These alternatives involved transformation
increases at both ENMAX No. 24 and ENMAX No. 37 Substation.
The transformer upgrade at ENMAX No. 24 Substation as identified in Alternative B is the
least cost alternative and has adequate capacity to supply the forecasted load in the area to
satisfy AESO’s requirements for the Standard Facilities. However, in order for ENMAX to
meet their Urban Reliability Guideline – Standards of Service while accommodating future
load growth, ENMAX proposes the installation of one new 30/40/50 MVA 138 kV-25 kV
transformer with 138 kV bus tie breaker at ENMAX No. 24 Substation as identified in
Alternative A.
The proposed development (Alternative A) at ENMAX No. 24 Substation will require:
!
!
!
!
!
Installation of one 50 MVA 138 kV-25 kV transformer with associated protection and
controls;
Addition of six 25 kV breakers to the existing 25 kV switchgear;
Installation of a 138 kV bus tie breaker with associated protection and controls;
Addition of a 138 kV PT; and
Addition of transformer secondary cables to the new 25 kV switchgear.
3
Interconnection Proposal for Transformation Capacity Upgrade at ENMAX No. 24 Substation
Based on current material procurement and required public consultation, the expected in
service date for this project is April 22, 2011.
The total proposed transmission development has an estimated cost of $5,660,000 (2008$,
+/- 30%).
3.0
NEED FOR DEVELOPMENT
The driver for the capacity addition at ENMAX No. 24 Substation is load growth in the region
of ENMAX No. 24 and ENMAX No. 37 Substation. No. 24 Substation load is predicted to
exceed the existing transformer capacity by winter 2010. Increasing the transformer capacity
at No. 24 Substation will address the capacity shortfall and will allow the current and
forecasted load within this area to be served during N-1 contingencies. Reference Appendix
A for the complete Statement of Need provided by ENMAX Power Distribution (DFO).
4.0
EXISTING SYSTEM
4.1
GEOGRAPHIC AREA
ENMAX No. 24 Substation is located on 9905 – 68 Street SE.
ENMAX No. 24 Substation is served by three 138 kV circuits: 138-24.81 Line, 138-24.82 Line
and 138-24.83 Line. 138-24.81 Line is connected to ENMAX No. 31 Substation. The
transmission line, 138-24.82, is connected to ENMAX No. 26 Substation. The transmission
line, 138-24.83, is connected to AltaLink Janet (74S) Substation. A Calgary transmission
system map is shown in Figure B-1 of Appendix B.
No. 24 Substation contains one 30/40/50 MVA, 138 kV-25 kV transformer that supplies one
set of 25 kV indoor switchgear. A substation single line drawing for No. 24 Substation is
shown in Figure C-1 of Appendix C.
4
Interconnection Proposal for Transformation Capacity Upgrade at ENMAX No. 24 Substation
STUDY CRTIERIA
The following study criteria and guidelines, published by the AESO, have been used to
develop the interconnection proposal:
Distribution Point-of-Delivery Interconnection Process Guideline:
! Upgrades to Existing Substation (Revision 0: March 22, 2005). The basis of the
transformer upgrades is a Loading Issue (section 3.1.2).
! Drivers of Need (Revision 0: March 22, 2005). The drivers of need for this proposal
are Load Growth (section 2.1) and Reliability (section 2.2). Technical and operational
considerations were studied to determine the proposed solution (section 2.3.4).
! Economic Evaluation (Revision 0: March 22, 2005). A discount rate of 6.28% is
used in the evaluation of alternatives.
! Standards of Service (Revision 0: March 22, 2005). The ENMAX Standards of
Service are applied to the analysis of this proposal (refer to Table 3.3-1 in AESO
Standards of Service).
4.2
AREA LOAD FORECAST
Table 4.3-1 shows the summer and winter diversified peak load forecasts provided by
ENMAX Distribution for No. 24 Substation and adjacent substations. This forecast is based
on the most recent information from ENMAX Power Distribution and has been updated from
the forecasted values in the DFO Need Statement.
Table 4.3-1 Peak Load Forecast for ENMAX No. 24, No. 26 and No. 37
Substations (25 kV Distribution System Only)
Sub
#
24
26
37
Area
Total
Actual Load - MVA
Forecasted Load - MVA
S/W
Peak
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
S
W
S
W
S
W
S
W
13
15
0
3
*
*
13
18
15
19
3
4
*
*
18
23
18
20
5
8
2
3
23
28
22
28
8
8
3
4
34
40
31
32
9
16
4
5
45
53
35
31
14
31
5
7
54
69
39
41
33
36
7
9
79
86
48
51
54
58
8
10
110
119
56
58
58
54
9
12
123
124
63
67
52
57
11
16
126
140
72
74
56
60
14
17
142
151
76
79
64
67
16
18
156
164
84
86
68
72
18
21
170
179
89
91
74
78
20
23
183
192
93
96
80
84
22
25
195
204
5
Interconnection Proposal for Transformation Capacity Upgrade at ENMAX No. 24 Substation
4.4
DETAILED LOAD FORECAST FOR DISTRIBUTION (25 KV) SYSTEM
Table 4.4-1 shows the summer and winter peak load forecasts for No. 24, No. 26 and No. 37
Substations. It also shows the Load at Risk (LAR) with the loss of transformer in No. 24
Substation. This forecast is based on the most recent information from ENMAX Power
Distribution and has been updated from the forecasted values in the DFO Need Statement.
Table 4.4-1 Peak Load Forecast for ENMAX No. 24, No. 26 and No. 37
Substations (25 kV Distribution System Only)
Sub
#
24
26
Transformer
24.1TR
(50MVA)
26.1TR
(50MVA)
26.2TR
(50MVA)
37
37.4TR
(13.3MVA)
LAR with loss of
24.1 TR
Actual Load - MVA
Forecasted Load - MVA
S/W
Peak
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
S
W
S
W
S
W
S
W
S
W
13
15
*
3
*
*
*
*
-----
15
19
3
4
*
*
*
*
-1
-7
18
20
5
8
*
*
2
3
---1
22
28
8
8
*
*
3
4
-4
-10
31
32
10
16
*
*
4
5
-16
-23
35
31
15
31
*
*
5
7
-24
-9
39
41
33
36
*
*
7
9
-19
-26
48
51
27
29
27
29
8
10
-15
-23
56
58
25
27
25
27
9
12
-28
-11
63
67
26
28
26
28
11
16
-13
-26
72
74
28
30
28
30
14
17
-29
-38
76
79
32
34
32
34
16
18
-43
-51
84
86
34
36
34
36
18
21
-57
-66
89
91
37
39
37
39
20
23
-70
-79
93
96
40
42
40
42
22
25
-82
-91
6
Interconnection Proposal for Transformation Capacity Upgrade at ENMAX No. 24 Substation
5.0
PROPOSED DEVELOPMENT
5.1
TRANSMISSION DEVELOPMENT
ENMAX TFO proposes the following development to address the DFO need for increased
transformation capacity at No. 24 Substation. Comparison of the transmission alternatives
can be found in Section 6.2. The preferred alternative is labeled as “Transmission Alternative
A.”
The proposed system additions are:
!
!
!
!
!
Installation of one 50 MVA 138 kV-25 kV transformer with associated protection and
controls;
Addition of six 25 kV breakers to the existing 25 kV switchgear;
Installation of a 138 kV bus tie breaker with associated protection and controls;
Addition of a 138 kV PT; and
Addition of transformer secondary cables to the new 25 kV switchgear.
6.0
TRANSMISSION ALTERNATIVES
6.1
ALTERNATIVES CONSIDERED
In order to meet the DFO request for increased capacity at ENMAX No. 24 Substation, three
alternatives were considered. The alternatives considered include: a 30/40/50 MVA, 138 kV25 kV transformer addition at ENMAX No. 24 Substation with a bus tie breaker, a 30/40/50
MVA, 138 kV-25 kV transformer addition at No. 24 Substation without a bus tie breaker and
addition of two 30/40/50 MVA, 138 kV-25 kV transformers at No. 37 Substation. The
preferred TFO solution, Transmission Alternative A, is the best overall economical and
technical solution to meet ENMAX Standards of Service.
Transmission Alternative B recommends a new 30/40/50 MVA, 138 kV-25 kV transformer at
ENMAX No. 24 Substation. As the majority of the upcoming load growth is situated close to
No. 24 Substation, it is geographically advantageous to have the transformer addition at this
substation. This alternative meets the AESO definition of a Standard Facility for the purposes
of applying AESO’s customer contribution policy. Additionally, the installation of a second
transformer at No. 24 Substation will provide better operational flexibility for transformer
maintenance.
7
Interconnection Proposal for Transformation Capacity Upgrade at ENMAX No. 24 Substation
Transmission Alternative C proposes the increase of transformation capacity by installing two
new 30/40/50 MVA, 138 kV-25 kV transformers at ENMAX No. 37 Substation and removing
the existing 13 kV-25 kV autotransformer (37.4TR). This would free up some 13 kV capacity
at No. 37 Substation. However, this alterative would not provide the required operational
flexibility at ENMAX No. 24 Substation for transformer maintenance and restoration as it will
remain a single transformer substation. Furthermore, it is the most costly alternative as it
requires two transformer additions, new 25 kV breakers, and 138 kV and 25 kV switchgear
additions.
Transmission Alternative A requires the addition of a new 30/40/50MVA, 138 kV-25 kV
transformer at No. 24 Substation. It is the same as Transmission Alternative B but with an
additional 138 kV bus tie breaker. Transmission Alternative A provides the best overall
economical and technical solution because the increase in transformation capacity will be
located near the majority of new load growth. This alternative meets the DFO need for
increased transformation capacity. Also, ENMAX No. 24 Substation was originally designed
to be a two transformer substation. Adding a second transformer at No. 24 Substation would
require less construction costs than Alternative C while still providing operational flexibility for
transformer maintenance. Although the cost of this alternative is greater than that of
Alternative B, it is still the preferred alternative due to the additional reliability and operational
flexibility provided by a bus tie breaker.
Table 6.2-1 shows the technical and economic evaluation of the transmission alternatives
that were considered.
Figure D-1, D-2, and D-3 in Appendix D show single line diagrams of the Transmission
Alternatives A, B, and C.
8
Interconnection Proposal for Transformation Capacity Upgrade at ENMAX No. 24 Substation
6.2
COMPARISON OF ALTERNATIVES
Table 6.2-1 Capital Cost to Implement Alternatives
Alternative
A. Transformer Addition at
ENMAX No. 24 Substation
(Preferred Solution)
!
Install a new 50 MVA
138 kV-25 kV
transformer with
associated protection
and controls.
!
Install six new 25 kV
breakers to existing 25
kV switchgear.
!
Addition of a 138 kV
bus tie breaker.
!
Addition of a 138 kV
PT.
!
Addition of transformer
secondary cables to the
25 kV switchgear.
B. Transformer Addition at
ENMAX No. 24 Substation
!
Install a new 50 MVA
138 kV-25 kV
transformer with
associated protection
and controls.
!
Install six new 25 kV
breakers to existing 25
kV switchgear.
!
Addition of transformer
secondary cables to the
25 kV switchgear.
Approx. Cost
x1000
Total Capital
Cost –
(Transmission
Development)
– 2008 =
$5,660
Total Capital
Cost –
(Transmission
Development)
– 2008 =
$5,327
Advantages
!
Meets DFO need for
increased transformation
capacity.
!
Majority of developing
load growth is situated
close to No. 24
Substation.
!
2nd Transformer at No. 24
Substation provides more
flexibility for transformer
maintenance.
!
Bus tie breaker provides
increased reliability.
!
Meets DFO need for
increased transformation
capacity.
!
Majority of developing
load growth is situated
close to No.24
Substation.
!
2nd Transformer at No. 24
Substation provides more
flexibility for transformer
maintenance.
!
Lowest cost.
Disadvantages
!
25 kV and 13 kV
capacity limitations at
No. 37 Substation until
2016.
!
Higher cost than
Alternative B.
!
25 kV and 13 kV
capacity limitations at
No. 37 Substation until
2016.
!
Less reliability with the
absence of the 138 kV
bus tie breaker.
Table Continued on Next Page
9
Interconnection Proposal for Transformation Capacity Upgrade at ENMAX No. 24 Substation
Table 6.2-1 Capital Cost to Implement Alternatives, continued
Alternative
C. Two Transformer
Additions at ENMAX No.
37 Substation
!
!
7.0
Remove 13 kV-25 kV
transformer (37.4TR)
Approx. Cost
x1000
Total Capital
Cost
(Transmission
Development)
– 2008 =
$9,975
Install two 50 MVA 138
kV-25 kV transformers
with associated
protection and controls.
!
Install fourteen new 25
kV breakers with new
25 kV switchgear.
!
Addition of transformer
secondary cables to 25
kV switchgear.
Advantages
!
Meets DFO need for
increased transformation
capacity.
!
Provides additional 25 kV
capacity at No. 37
Substation.
!
Disadvantages
!
Less flexibility at No. 24
Substation for supporting
the projected load
growth.
!
Most expensive
alternative.
Increases 13.3 MVA of 13
kV capacity.
CURRENT PROJECTS
Due to the increase in commercial and industrial development in the south east section of the
city, capacity additions will be needed to supply this growing load. Current projects in this
area assume the implementation of the work outlined in this IP:
!
8.0
2010 – A capacity increase at ENMAX No. 26 Substation. No. 26 Substation is
expected to have two 50 MVA 138 kV-25 kV transformers installed for a total
substation capacity of 100 MVA.
FUTURE CONSIDERATIONS
Future additions in this area assume the implementation of the work outlined in this IP:
!
2016 – A capacity increase at ENMAX No. 37 Substation. No. 37 Substation is
expected to have one new 50 MVA 138 kV-25 kV transformer installed.
10
9.0
TRANSMISSION CONSTRUCTION SCHEDULE
Figure 7.1 – Project Timeline
11
APPENDIX A - Statement of Need
12
Interconnection Proposal for Transformation Capacity Upgrade at ENMAX No. 24 Substation
APPENDIX B – Existing Transmission Configuration
26
Figure B-1
Calgary Area Transmission System
27
APPENDIX C – Existing Substation Configuration
28
Figure C-1
No. 24 Substation Single Line Diagram
29
Interconnection Proposal for Transformation Capacity Upgrade at ENMAX No. 24 Substation
Figure C-2
No. 37 Substation Single Line Diagram
30
APPENDIX D – Proposed Transmission Alternatives
31
Figure D-1
Transmission Alternative A (Preferred) – Install Transformer at No. 24 Substation with Bus Tie Breaker
32
Figure D-2
Transmission Alternative B – Install Transformer at No. 24 Substation without Bus Tie Breaker
33
Figure D-3
Transmission Alternative C – Install Two Transformers at No. 37 Substation (1 of 2)
34
Figure D-4
Transmission Alternative C – Install Two Transformers at No. 37 Substation (2 of 2)
35