Proposed Revision Request Detail Help
PRR Life Cycle*********Closed
PRR Details
PRR #
1338
Title Update measured demand precalc to fix pro-ration for load aggregation point neutrality and CC 8835 allocations
Date Submitted 4/1/2021 1:16 PM
PRR Category B
Priority Emergency
Owner Corona, Brenda (CAISO)
Status Closed
Status End Date 7/13/2021 11:59 PM
Related BPM Settlements and Billing
BPM Section CG PC Measured Demand Over Control Area v5.13.5
CG PC Measured Demand Over Control Area v5.14.1
CG PC Real Time Congestion v5.3.5
CG PC Real Time Congestion v5.4.1
CG PC Real Time Congestion v5.5.1
CG PC Real Time Congestion v5.6
CG CC 6475 Real Time Uninstructed Imbalance Energy Settlement v5.5.5
CG CC 6475 Real Time Uninstructed Imbalance Energy Settlement v5.6.1
CG CC 6985 Real Time Marginal Losses Offset v5.3.5
CG CC 6985 Real Time Marginal Losses Offset v5.4.2
CG CC 6985 Real Time Marginal Losses Offset v5.5.1
CG CC 6985 Real Time Marginal Losses Offset v5.6
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Existing Language
 

See BPM attached to this PRR

Proposed Language
 

See BPM attached to this PRR

Reason For Revision
 

Issue detected with the capacity-based metered CAISO Demand allocation that goes into RAAIM Precalc (conduit only) and eventually used in CC 8835 Annual RAAIM Neutrality. This value - which is supposed to not include Excess Behind the Meter Production (EBTMP) values – instead got doubled EBTMP values at the CAISO total level.

 

Another issue was found on a metered CAISO Demand pro-ration that implements the following Tariff section:

 

11.5.2.3 Revenue Neutrality Resulting from Changes in LAP Load Distribution Factors

 Any resulting revenue from changes in the LAP Load Distribution Factors between the Day-Ahead Market and the Real-Time Dispatch shall be allocated to metered CAISO Demand in the corresponding Default LAP.”

 

The settlement error on this LAP Neutrality allocation was that participating load does not contribute to the Default LAP metered CAISO Demand. In the pro-ration, while the numerator was correct, the denominator wasn’t. The issue affected both post-EBTMP (1/1/2021 onwards) and pre-EBTMP calculations, but will be resolved using the same formula for those timeframes.
Configuration guide for PC Measured Demand Over Control Area has been updated to fix these two separate issues. Minor change to expose attributes u (UDC) and M’ (MSS ID) were also made for input change from this pre-calculation into CC 6475, CC 6985, and PC Real Time Congestion.
 
The fix will be deployed on or about April 28, 2021.
 
The effective date will be TD 1/1/2021 for the CC 8835 measured demand fix which impacts RAAIM PC and eventually CC 8835. However, the LAP neutrality allocation fix will be effective TD 8/1/2018. This latter fix requires T+33M settlement and impacts the following CCs:
 

  1. direct impacts to CC 6475 Uninstructed Imbalance Energy, CC 6985 Real-Time Marginal Loss Offset, and PC Real Time Congestion (to CC 6774 Real Time Congestion Offset)
  2. potentially indirect impacts, CC 6477 Real Time Imbalance Energy Offset, and CC 6478 Real Time System Imbalance Energy Offset.

 
As customary for retroactive settlement, Trade Dates that were already settled prior to the production fix will be resettled with the scheduled recalculation for those trade dates.
 

Click here to view the Recommendation Details for this PRR
BPM PRR Submitter

Corona, Brenda (CAISO)
Modified BPM language proposed by the PBM Chnage Management Coordinator

The ISO proposes no modified BPM language beyond that proposed in the BPM 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 were implemented on 4/28/2021 on an emergency basis.
Proposed effective date(s) of the BPM PRR

The ISO proposes an effective date of 1/1/2021 for the BPM revisions.
Other recommended actions

The ISO does not recommend any other actions on this BPM PRR.
Click here to view the Final Decision for this PRR
Final Decision

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

No comments submitted.

Effective Date

1/1/2021
Action

Adopt the recommendation as originally issued

None
Announcements
PRR 1338 has been made available at this time to allow additional time to review and submit comments. 
Comment period will close 05/18/2021.  PRR will be discussed during the May and June BPM meetings.
Posted On - 4/8/2021 9:06 AM
Impact Analysis
Initial Comments
No Initial Comments available for this PRR.
Recommendation Comments
No Recommendation Comments available for this PRR.
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