Resources​


Western Energy Imbalance Market (WEIM) Participants

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.

 

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.

 

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.


 

ISO Department of Market Monitoring

The ISO Department of Market Monitoring (DMM) keeps a close watch on the efficiency and competitiveness of the Western Energy Imbalance Market. Links to tariff provisions discussing DMM’s role and responsibilities and various DMM reports, presentations and tariff filings are available on the ISO website.


 

  • Hidden contact us document
  • Hidden EDAM Documents
    • Physical Metering Assesment4/16/2024 16:59
      At the start of the process for EDAM onboarding, you will be asked to complete a Physical Metering Assessment document to help the ISO team understand what types of changes we can expect regarding metering. This ensures we allocate necessary resources to support any expected changes.
    • EDAM Settlements Overview Plan4/16/2024 16:59
      The Settlements Overview Plan describes the various educational sessions the ISO will provide to ensure you are prepared to perform Settlements activities needed for the EDAM onboarding and for participating in the market.
    • EDAM Onboarding Overview1/03/2025 12:17
      The EDAM Onboarding Overview provides an overview of the various tracks and deliverables required to ensure a smooth transition to EDAM in an 18 month timeframe.
    • EDAM Training Timeline 20262/26/2025 11:33
      The ISO will provide a variety of training to ensure you are ready when you move into the EDAM market. This document shows you an overview of what an EDAM training cycle looks like for a 2026 Implementation.
    • EDAM Charge Codes5/12/2025 10:53
      The EDAM Settlement Charge Codes document provides a complete list of settlement charge codes needed to participate in EDAM.
    • Interchange Scheduling Overview6/17/2025 15:51
      The Interchange Scheduling Overview document describes the interchange scheduling in EDAM between various entity scenarios, including between two EDAM entities, an EDAM to WEIM Only entity, and an EDAM to non-EDAM/non-WEIM entity.

Computer Based Training (CBT)


Get ready to participate in WEIM
​Leading the WEIM Transition
​The Basics of the Real-time Market​
Base Schedules Foundational Concepts
​System Outages Foundational Concepts
​Metering Foundational Concepts
​Settlements Foundational Concepts
EDAM Participation Structure Overview



Learning center courses


Western Energy Imbalance Market training

Explore topics pertaining to the real-time energy imbalance market that enables participants to buy and sell energy when needed.