Resources​

These resources are intended for WEIM entities and participating generators that are directly involved in the Western Energy Imbalance Market. 

Business Practice Manuals

Business Practice Manuals contain implementation details through which the California ISO and market participants conduct business in accordance with the Tariff. The Business Practice Manual for Western Energy Imbalance Market contains information about all WEIM entity types.

Tariff

The Western Energy Imbalance Market is governed by the California ISO (ISO) FERC-approved Tariff. Each section or appendix of the tariff is maintained and updated independently according to effective dates of the FERC accepted tariff amendment

Integrate with the ISO full network model

The network model defines system parameters, price node and market scheduling limit mappings and planned network model updates.

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  Western Energy Imbalance Market Full Network Model Schedule - 20257/22/2025 11:05
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  Western Energy Imbalance Market Full Network Model Schedule - 20265/21/2025 11:29
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  Western Energy Imbalance Market Full Network Model Scope Template11/02/2020 15:43
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  Western Energy Imbalance Market Full Network Model Late Scope Change Request Form3/30/2023 09:49
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  Western Energy Imbalance Market Generator Resource Data Template Version 18.08/02/2024 14:08
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  Western Energy Imbalance Market Interchange Definition Template12/16/2020 10:24
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  Modeling Submission Checklist9/10/2024 16:31

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• Create a copy
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WEIM Resource Onboarding Procedure

This procedure helps WEIM entities submit the required onboarding documentation for new participating and non-participating resources. The procedure also applies when a non-participating resource would like to become a participating resource.

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  Energy Imbalance Market Scheduling Coordinator Request for BSCID - Letter Template
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  Western Energy Imbalance Market Procedure for Non-Participating and Participating Resources12/17/2024 12:06
  Summarizes the process to set up, convert or end date participating or non-participating resources in the WEIM market.
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  WEIM - New Scheduling Coordinator Acceptance - Resource - Letter Template6/30/2025 17:10
  For use when setting up a new or transferring an existing WEIM resource
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  WEIM - Resource Owner Scheduling Coordinator Selection - Letter Template5/20/2025 11:41
  For use when setting up a new or transferring an existing WEIM resource
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  WEIM - Transfer - Resource Relinquishing Scheduling Coordinator - Letter Template5/20/2025 11:41
  For use when transferring or end dating SC association for WEIM resources
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  WEIM - Transfer - Resources Between BSCIDs - Same Scheduling Coordinator5/20/2025 11:41
  For use to transfer existing WEIM resource BSCID to another BSCID within the same company
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  Resource Control Agreement Disclosure Form8/02/2024 14:08
  For use with new resource configuration and resource transfers. This will be submitted by the accepting/new SC.

• Rename Group
• View/Edit Properties
• View Impact
• Add Existing Group/Document
• New Group
• New Page Link
• Remove Group
• Undo Changes
• Copy Item
• Paste
  • Paste as Child
  • Paste Above
  • Paste Below
• Move
  • Move as Child
  • Move Above
  • Move Below

• Update Document Title
• View/Edit Properties
• View Impact
• Remove Document
• Delete Document
• Undo Changes
• Copy Item
• Paste
  • Paste as Child
  • Paste Above
  • Paste Below
• Move
  • Move as Child
  • Move Above
  • Move Below

• View Impact

• View/Edit Properties
• View Impact
• Remove Page Link

• Create a copy
• Delete

 

Transmission customers of WEIM entities

Our computer based training modules are for Transmission Customers of WEIM Entities to learn about participation in the WEIM, the real-time market, base schedules, system outages, metering and settlements. For WEIM updates, subscribe to news releases and notices.

Transmission customers should contact their WEIM entity for most questions. For all other questions, contact ISO customer service.

Section 29 of the ISO Tariff addresses the provisions related to the Western Energy Imbalance Market. Appendix B. 17 – 20 contains agreements related to WEIM participation.

Regulatory Filings

All publicly available California ISO-authored filings and FERC orders are posted on the ISO website.