Stakeholder Comment and Rationale Form
AESO AUTHORITATIVE DOCUMENT PROCESS
Stakeholder Consultation Draft
2011-03-17
Proposed New and Amended ISO Rules Definitions
Date of Request for Comment [yyyy/mm/dd]:
Period of Consultation [yyyy/mm/dd]:
Comments From:
2011-03-17
2011-03-17
through
2011-04-15
Company Name
Contact:
Company Contact
Phone:
Contact Phone Number
E-mail:
Date [yyyy/mm/dd]:
Listed below is the summary of changes for the proposed new, removed or amended ISO rules definitions. Please refer back to the Letter of Notice under the “Attachments to Letter of Notice”
section to view the actual proposed content changes to the ISO rules definitions. Please place your comments / reasons for position underneath (if any).
ISO Rules Definitions – New
Existing
Proposed
No definition currently exists in the
AESO’s Consolidated Authoritative
Document Glossary.
“Alberta interchange capability”
means the amount of
interconnected electric system
transmission capability the ISO
determines is available for allocation
to all transfer paths, after subtracting
amounts for relevant factors
including system operating limits,
generating capacity and Alberta
internal load.
Rationale
In the AESO’s opinion, proposed
New ISO Rules Section 206.3
currently being consulted on
separately requires a new ISO rules
definition for Alberta interchange
capability to more clearly distinguish
between the various levels at which
transmission capability is calculated.
This is the highest, macro-level
calculation.
Stakeholder Comments and/or
Alternate Proposal
Comment # 1: Insert Comments /
Reason for Position (if any)
AESO Reply
ISO Rules Definitions - Amended
Issued for Stakeholder Consultation: 2011-03-17
Page 1 of 4
Existing
Proposed
Rationale
“available transfer capability”
means a measure of the transfer
capability remaining in the physical
transmission network for further
commercial activity over and above
already committed uses.
Mathematically, ATC is defined as
the total transfer capability (TTC)
less the Transmission Reliability
Margin (TRM), less the sum of
existing transmission commitments
(which includes retail customer
service) and the capacity benefit
margin.
“available transfer capability”
means the amount of total transfer
capability the ISO determines is
available for interchange
transactions over a single transfer
path after subtracting any
transmission reliability margin
relevant to the transfer path.
The AESO has amended this
definition to incorporate other
existing definitions, to be consistent
with the redrafted section of the ISO
rules and to reflect the AESO’s
Transition of Authoritative
Documents (“TOAD”) project drafting
principles.
“electronic tag (e-tag)” means an
electronic form which contains
information and data necessary for
balancing authorities and other
operating entities to assess, confirm,
approve or deny, implement, and
curtail interchange transactions as
stipulated by NERC.
“e-tag” means an electronic identifier
which contains specific transactional
information, necessary for
scheduling an interchange
transaction.
The AESO has simplified this
definition and amended it to include
the concept of an “identifier”.
Comment # 3: Insert Comments /
Reason for Position (if any)
“interchange schedule” means the
planned interchange of energy
between two adjacent balancing
authorities that results from the
implementation of one or more
interchange transaction(s).
“interchange schedule” means the
net sum of the import and export
interchange transactions for a
given settlement interval as agreed
between the ISO and the relevant
adjacent balancing authority.
The AESO has amended this
definition to clarify its meaning.
Comment # 4: Insert Comments /
Reason for Position (if any)
“total transfer capability” means
the amount of electric power that can
be transferred over the
interconnected transmission network
in a reliable manner while meeting
“total transfer capability” means
the amount of transmission
capability the ISO determines is
available for importing or exporting
energy over a single transfer path in
The AESO has amended this
definition to make the format more
consistent with the definitions of
‘Alberta interchange capability’ and
‘available transfer capability’.
Comment # 5: Insert Comments /
Reason for Position (if any)
Issued for Stakeholder Consultation: 2011-03-17
Stakeholder Comments and/or
Alternate Proposal
Comment # 2: Insert Comments /
Reason for Position (if any)
AESO Reply
Page 2 of 4
all of a specific set of defined preand post-contingency system
conditions.
a reliable manner after subtracting
amounts required for contingencies
and conditions relevant to the
transfer path.
“transmission reliability margin”
means that amount of transmission
transfer capability necessary to
ensure that the interconnected
transmission network is secure
under a reasonable range of
uncertainties in system conditions.
“transmission reliability margin”
means the amount of available
transfer capability, the ISO
determines is necessary to ensure
that the reliability of the
interconnected electric system is
maintained under a reasonable
range of uncertainties in operating
conditions.
The AESO has amended this
definition to make the format more
consistent with the definition of
‘available transfer capacity’.
Comment # 6: Insert Comments /
Reason for Position (if any)
“wheel through interchange
transaction” means a transaction
that is represented by a single e-tag
and an import offer and an export bid
of equal values, that crosses two or
more balancing authority area
boundaries, utilizes the AIES, but
does not have its associated energy
consumed or produced in the AIES.
“wheel through transaction”
means an interchange transaction
that:
One of the TOAD drafting principles
requires the AESO to try to avoid
incorporating the name of one
defined term in the name of another
defined term. Accordingly, the name
of this definition has been changed.
In addition, the AESO has added
additional clarity to the definition
both with the revised format and the
updated content.
Comment # 7: Insert Comments /
Reason for Position (if any)
(a) is represented by a single etag;
(b) is comprised of an import
offer over one transfer path
and an export bid over a
different transfer path that
specify quantities equal to
one another; and
(c) originates and terminates
outside of the Alberta
balancing authority area.
Issued for Stakeholder Consultation: 2011-03-17
Page 3 of 4
ISO Rules Definitions – Removed
Existing
Proposed
No ISO rules definitions are
proposed for removal
Stakeholder Comments and/or
Alternate Proposal
Comment # 8: Insert Comments /
Reason for Position (if any)
ISO Rules Definitions - Other
Stakeholders wishing to comment on specific provisions are requested to
copy the provision into this area and provide comments.
Comment # 9: Insert Comments /
Reason for Position (if any)
Issued for Stakeholder Consultation: 2011-03-17
Rationale
AESO Reply
Page 4 of 4