Proposed Revision Request Detail Help
PRR Life Cycle*********Closed
PRR Details
PRR #
1130
Title Update the pre-calculation spin non-spin no pay quantity configuration to properly address fast start units
Date Submitted 1/28/2019 8:47 AM
PRR Category B
Priority Normal
Owner Peacock, Bonnie (CAISO)
Status Closed
Status End Date 4/16/2019 11:59 PM
Related BPM Settlements and Billing
BPM Section Spin Non-Spin No Pay Quantity Pre-calculation
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Existing Language
 
See BPM attached to this PRR
Proposed Language
 
See BPM attached to this PRR
Reason For Revision
 

BPM – Spin and Non-Spin No Pay Quantity Pre-calculation 5.20 –

Research was being conducted for SDS# 206801 for a fast start unit.  The concern was the unit was being rescinded (no-pay) the full amount of what has been awarded instead of the difference between the dispatch and which was undelivered.  Although this dispute was denied and deemed to be per design and aligned with tariff, the equations derived for fast start units were being assumed that the unit was always offline prior to AS dispatch.  The proposed solution is, in the equations where fast start units are being determined, also add a check to qualify whether the unit is online from the FMM. 

 

The planned production deployment date is 3/26/2019 with an effective date of 4/1/2019.

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

Peacock, Bonnie (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

Comments were submitted by Matt Richardson of SDGE on 2/11/19.

ISO response to the comments on 2/14/19: 
Thank you for providing this request. Please work with your Customer Services Rep to open a CIDI ticket to allow the ISO to review and provide a formal response.
Action

Approve the BPM PRR as submitted

NA
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 4/24/2019 on a normal basis.
Proposed effective date(s) of the BPM PRR

The ISO proposes an effective date of 5/1/2019 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

5/1/2019
Action

Adopt the recommendation as originally issued

None
Announcements
Effective date revised to 5/1/2019 as a result of an updated deployment schedule.
Posted On - 2/12/2019 2:42 PM
Impact Analysis
IA - Impact Analysis Form for Spin Non-Spin No Pay Quantity PC.doc    
Notes:
Initial Comments
SDG&E supports the proposed changes, but also recommends that the CAISO take this opportunity to correct what we view as another flaw in the No Pay process.   On occasion, we’ve seen fractional dispatches that are categorized in expected energy as “spinning Reserve” (Non-Spinning reserve as well) triggering Spin/NSpin no pay.  In several cases that we’ve brought to the CAISO’s attention, a generator sold spin capacity and then expected energy showed Spinning Reserve dispatches of <.1MWs for the hour, which translates into five minute interval spin dispatches of less than a 1/100th of a MW.  When the no pay logic evaluates the generators performance in relation to dispatch quantities, there are no thresholds used other than considering whether a unit delivered at least 90% of the Spin/Nspin dispatch.  As a result, a unit that is following dispatch and would be considered as “accurately” responding when looking at expected energy compared to the meter overall, is penalized for deviations that are so small that it’s virtually impossible for the unit to monitor and comply. (The CAISO’s ADS only issues Dispatch Operating Instructions (DOTs) out to two decimal places).  It’s not clear why the ISO is issuing fractional spinning reserve dispatches or why expected energy is showing these fractional quantities, but it would appear there is a problem occurring in an upstream system or with the creation of the expected energy data itself. 

In one of the examples we’ve provided in the past, the unit was deviating by .5% from expected energy and yet had the Ancillary Service payment rescinded for not delivering at least 90% of a spin dispatch of .007 MWs.  The fractional spin dispatch in this case caused unjustified rescissions for the unit that was, in reality, following their EE when looking at the interval as a whole. We suggest that the ISO update the expected energy logic to prevent these types of dispatches from showing up in the data and flowing through to the No Pay calculations.  If this is not possible, some threshold should be included in the calculation to prevent these dispatches from causing unjustified capacity payment rescissions.   We do not view this as a tariff or BPM change, but rather a correction or a systematic data problem. 

We would be happy to provide trade dates, resource ID’s, and hours in which we’ve seen this problem occur.
2/11/2019 2:11 PM
Logged By - Matt Richardson (SDGE)
---------------------------------------------
Thank you for providing this request. Please work with your Customer Services Rep to open a CIDI ticket to allow the ISO to review and provide a formal response.
2/14/2019 9:27 AM
Responded By - Peacock, Bonnie (CAISO)
Recommendation Comments
No Recommendation Comments available for this PRR.
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