Document 2243472

September 8, 2014
To:
Alberta Utilities Commission (“AUC”)
Re:
Notice of Filing – Final Proposed “Allowable Dispatch Variance” Amended ISO Rule Definition
(“Allowable Dispatch Variance Definition Amendment”)
The Alberta Electric System Operator (“AESO”) is filing the final proposed Allowable Dispatch Variance
Definition Amendment pursuant to section 20.2(1) of the Electric Utilities Act (“EUA”) and sections 11 through
13 of AUC Rule 017. The AESO is authorized to make ISO rules in accordance with sections 19 and 20 of the
EUA.
Background
The AESO issued a Letter of Notice dated April 29, 2014, setting out the proposed Dispatchable Wind Rule
Changes, which are based on the results of the wind dispatch pilot and the Phase Two Wind Integration Recommendation Paper. The proposed Dispatchable Wind Rule Changes will allow pool participants for wind
aggregated generating facilities to voluntarily offer into the energy market merit order at prices greater than
$0/MWh. All wind aggregated generating facilities will be required to maintain accurate available capability
values through the Energy Trading System.
Concurrent with the development of the proposed Dispatchable Wind Rule Changes, the AESO determined
that an amendment to the definition of “allowable dispatch variance” was required because wind aggregated
generating facilities cannot control their output when wind speed is decreasing.
Under the final proposed Allowable Dispatch Variance Definition Amendment, if a wind aggregated generating
facility’s potential real power capability is less than its dispatch quantity in real-time, the lower boundary of its
allowable dispatch variance will be measured from that potential real power capability. The wind aggregated
generating facility will remain in compliance with the applicable ISO rules as long as its output does not
exceed the dispatch quantity by more than the allowable dispatch variance.
If the potential real power capability of a wind aggregated generating facility is greater than or equal to the
dispatch quantity, the allowable dispatch variance is measured from the dispatch quantity, in the same way
that it is for a generating source asset that is not a wind aggregated generating facility.
The potential real power capability values are currently, and will continue to be, provided to the AESO by wind
aggregated generating facilities using supervisory control and data acquisition.
Summary of AESO Consultation
On April 29, 2014, the AESO posted a Letter of Notice on its website and in its stakeholder newsletter
requesting written comments from market participants and interested parties that the AESO considered likely
to be affected by the Allowable Dispatch Variance Definition Amendment.
On May 29, 2014, the AESO posted on its website and in its stakeholder newsletter written comments
received from market participants and interested parties in response to the Letter of Notice, as well as the
name of the market participant or interested party who submitted each comment and the date on which the
comment was submitted.
Filed with the Commission:
September 8, 2014
Page 1 of 2
On June 3, 2014, the AESO posted on its website and in its stakeholder newsletter late comments received
from market participants and interested parties in response to the Letter of Notice, as well as the name of the
market participant or interested party who submitted each comment and the date on which the comment was
submitted.
AESO Reply to Stakeholder Comments
In accordance with section 8 of AUC Rule 017, the AESO is required to provide a reply to written comments
received in response to a Letter of Notice.
On August 19, 2014, the AESO posted its Reply to Stakeholder Comments on its website and in its
stakeholder newsletter and included the final proposed Allowable Dispatch Variance Definition Amendment.
Please see the AESO Reply to Stakeholder Comments for a summary of replies to written comments
received and the rationale or basis for the position of the AESO that explains why certain positions were
rejected or accepted.
Attachments to Notice of Filing
In accordance with section 13 of AUC Rule 017, the following documents are attached to this Notice of Filing:
1. Letter of Notice on Dispatch Variance Definition Amendment dated April 29, 2014;
2. Stakeholder Comment on Letter of Notice dated May 29, 2014;
3. Late Stakeholder Comments on Letter of Notice dated June 3, 2014;
4. AESO Reply to Stakeholder Comments dated August 19, 2014; and
5. Blackline and clean copy of the final Proposed Allowable Dispatch Variance Definition Amendment.
Proposed Effective Date
In accordance with section 20.3 of the EUA, the AESO proposes that the Allowable Dispatch Variance
Definition Amendment become effective on April 1, 2015 concurrent with the Dispatchable Wind Rule
Changes.
The AESO submits that the final proposed Allowable Dispatch Variance Definition Amendment complies with
AUC Rule 017 and further submits that the Allowable Dispatch Variance Definition Amendment is not
technically deficient, supports the fair, efficient and openly competitive operation of the market for electricity,
and is in the public interest.
If you have any questions, please contact the undersigned.
Sincerely,
“Original Signed By”
Marina Jagbandhansingh
Manager, Regulatory Services
Phone: 403-539-2587
Email: [email protected]
Attachments
Filed with the Commission:
September 8, 2014
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