Proposed Revision Request Detail Help
PRR Life Cycle*********Closed
PRR Details
PRR #
1529
Title Update configuration guide for intertie deviation settlement to resolve rounding issue
Date Submitted 8/21/2023 11:52 AM
PRR Category B
Priority Normal
Owner Ahmadi, Massih (CAISO)
Status Closed
Status End Date 11/14/2023 11:59 PM
Related BPM Settlements and Billing
BPM Section The following BPM and its versions are subject to the current PRR:

CG CC 6456 Intertie Deviation Settlement v5.5.1
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Existing Language
​See BPM attached to this PRR
Proposed Language
See BPM attached to this PRR ​
Reason For Revision
 

​A dispute for charge code 6456 (Intertie Deviation Settlement) revealed the calculation, and in particular, the price used for BA5MResourceHourlyBlockIntertieDeviationSettlementAmount  (BA_5M_RSRC_HRLY_BLOCK_TIE_DEV_STLMT@AMOUNT) is incorrect in very specific and relatively rare case. The comparison condition check fails due to rounding of intermediate calculation to the 8th decimal place.

 The proposed reformulation makes the calculation less sensitive to the global setting of rounding data to the 8th decimal place for Settlements calculation purposes. As far as impacted charge codes, CC 6456 Intertie Deviation Settlement will reflect settlement changes. The successor charge code CC 6458 (Intertie Deviation Settlement Allocation) can reflect settlement value changes as well.

 

The retroactive fix changes are to be deployed around 10/25/2023 and will impact retroactively settled charge codes for Trade Dates 6/1/2022.
Click here to view the Recommendation Details for this PRR
BPM PRR Submitter

Ahmadi, Massih (CAISO)
Modified BPM language proposed by the PBM Chnage Management Coordinator

​The ISO proposes no additional modifcation beyond the proposed PRR.

Identification of the authorship of comments

No comments were received.
Action

Approve the BPM PRR as submitted

N/A
Statement of apparent requirements of the BPM PRR

This BPM PRR contains basic language changes.
Priority and rank for any BPM PRR requiring a CAISO system change

There are system changes associated with this PRR. The system changes are planned for implementation on 6/1/2022 on a normal basis.
Proposed effective date(s) of the BPM PRR

The ISO proposes an effective date of 6/1/2022 for the BPM revisions.
Other recommended actions

The ISO does not recommend any other actions on this BPM PRR.
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Final Decision

The ISO will adopt the BPM change as proposed in the recommendation.
Stakeholder Comment

No comments submitted

Effective Date

6/1/2022
Action

Adopt the recommendation as originally issued

Announcements
No Announcements has been posted for this PRR.
Impact Analysis
IA - Intertie Deviation Settlement rounding issue.doc    
Notes:
Initial Comments
No Initial Comments available for this PRR.
Recommendation Comments
No Recommendation Comments available for this PRR.
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