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Proposed Revision Request Detail Help
PRR Life Cycle*********Closed
PRR Details
PRR #
1612
Title Stage 2 veriable energy resource and aggregate capability constraints limits
Date Submitted 12/23/2024 8:56 AM
PRR Category A
Priority Normal
Owner Martin, Michael (CAISO)
Status Closed
Status End Date 3/18/2025 11:59 PM
Related BPM Market Operations
BPM Section Section 3.1.14.1.1
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Existing Language
 

​​See Attached

Proposed Language
 

​See Attached​

Reason For Revision
 

If a Stage 2 VER is in an ACC with another unit that schedules Energy and Ancillary Services, there are situations where the RTD dispatch may exceed the Aggregate Capability Constraint limit so the Scheduling Coordinators fo these resources must manage the output during this time.​​

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BPM PRR Submitter

Martin, Michael (CAISO)
Modified BPM language proposed by the PBM Chnage Management Coordinator

​Approve PRR as submitted

Identification of the authorship of comments

NA
Action

Approve the BPM PRR as submitted

NA
Statement of apparent requirements of the BPM PRR

NA
Priority and rank for any BPM PRR requiring a CAISO system change

NA
Proposed effective date(s) of the BPM PRR

No specific timeframe, normal process after BPM process completes
Other recommended actions

Provided the folloing on PRR 1612:  This PRR is not like PRR 1610 and is not requiring self-scheduling by any resources.  This is an informational update that resources in an Aggregate Capability Constraint may receive RTD DOTs that exceed the ACC limit if a Stage 2 VER is in the ACC with another resource that participates with energy and Ancillary Services.  Resources that are in an ACC have the responsibility to ensure their combined metered output stay within the ACC limit so this is an informational update to be cautious during this short Stage 2 VER timeframe.
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Final Decision

Proceed with original
Stakeholder Comment

Stakeholders noted concern with this and PRR 1610, however this PRR is informational and does not change any process or procedure.  1610 is being reviewed seaparately.

Effective Date

Action

Adopt the recommendation as originally issued

NA
Announcements
Note: This PRR is not like PRR 1610 and is not requiring self-scheduling by any resources.  This is an informational update that resources in an Aggregate Capability Constraint may receive RTD DOTs that exceed the ACC limit if a Stage 2 VER is in the ACC with another resource that participates with energy and Ancillary Services.  Resources that are in an ACC have the responsibility to ensure their combined metered output stay within the ACC limit so this is an informational update to be cautious during this short Stage 2 VER timeframe.
Posted On - 2/3/2025 9:36 AM
Impact Analysis
Impact Analysis not available.
Initial Comments
Terra-Gen, LLC - Initial Comments on PRR 1612
Terra-Gen opposes PRR 1612 and concurs with WPTF's initial comments noting the driver for this PRR appears to be PRR 1610. Both of these related PRRs should be considered through formal stakeholder proceedings, not addressed through PRR BPM changes.
1/9/2025 4:48 PM
Logged By - Chris Devon (Terra-Gen, LLC)
Is it WPTF's understanding that this PRR is related to PRR 1610 which is requiring that VERs in Stage 2 self-schedule. WPTF opposed PRR 1610 thus also opposes this PRR 1612. This PRR basically states that because the CAISO now requires Stage 2 VERs to self-schedule (PRR 1610) that any SC with a VER co-located with another resource and utilizes an ACC will have to be able to ensure the combined output of the two resource does not exceed the ACC. With economic offers, the market could curtail the VER to ensure the combined output does not exceed the ACC. However, this PRR means that the SC will either have to (1) not allow the VER to generate as capable if it will cause the combined output to exceed the ACC, which contradicts the reason behind the CAISO wanting VERs to self-schedule in the first place, or (2) not bid the full amount of the other co-located resource which will likely go against RA bidding obligations. For these reasons, WPTF opposes PRR 1612 and encourages the CAISO to discuss whatever issue its trying to resolve through PRRs 1610 and 1612 in an open stakeholder process so it can be properly vetted by stakeholders and result in any needed FERC filings.  
1/9/2025 1:58 PM
Logged By - Gridwell Consulting for WPTF (Western Power Trading Forum)
Recommendation Comments
No Recommendation Comments available for this PRR.
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# of Appeals Abandoned - 0
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