Quick and accurate settlements help markets function

Settlements are the calculation, billing, and invoicing of charges and payments for market and transmission-related activities between market participants and the ISO. The settlement cycle follows a specific timeline and processes for publication of statements, invoices and payment advices, dispute submittals and payments.

Process and requirements

ISO Tariff
Business Practice Manual for Settlements and Billing
Business Practice Manual for Credit Management and Market Clearing

Market, RC West and administrative charges

Many specific charge type categories are used within settlements and invoice processes according to involvement in the Markets and RC West.

ISO Charge Codes Matrix6/25/2021 10:35
ISO RMR Payments Calendar Tool5/24/2023 10:54
Invoicing Schedule for Jan-Dec 2023 Monthly and 2024 Annual CRR Auctions11/17/2022 14:39
Invoicing Schedule for Jan-Dec 2022 Monthly and 2023 Annual CRR Auctions (Revised)11/18/2022 10:09
Invoicing Schedule for Jan-Dec 2021 Monthly and 2022 Annual CRR Auctions11/20/2020 14:53
California ISO Payments Calendar 202310/24/2022 08:45
California ISO Payments Calendar 202310/24/2022 08:45
California ISO Payments Calendar 202210/20/2021 13:11
California ISO Payments Calendar 202210/20/2021 13:11
California ISO Payments Calendar 202110/28/2020 09:07
California ISO Payments Calendar 202110/28/2020 09:07
ISO Settlement System Audit Report Jan 9, 20151/14/2015 11:15
RC West payments calendar
Settlement mitigation
Supporting information regarding settlement estimation methodology in the event of a system error.
Grid management charge
The Grid Management Charge (GMC) is assessed to wholesale market customers to recover California ISO costs.
Transmission access charge rates
Unaccounted for energy (UFE) estimation
Amendment 60 - must offer waiver denial reports
Participating intermittent resource program (PIRP) protective measures

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Credit policy

The credit policy is detailed in the ISO Tariff and the Business Practice Manual for Credit Management and Market Clearing. Consistent with the policy, market participants use the following forms to demonstrate that they meet the ISO minimum participation and financial security requirements and to request an unsecured credit limit.

ISO Unsecured Credit Application2/01/2017 15:46
ISO Form Letter of Credit5/25/2022 11:11
ISO Form Guaranty2/02/2011 13:31
Officer Certification Form2/24/2022 16:25
California ISO Credit Management Frequently Asked Questions (FAQs)10/06/2021 09:17
Credit Management - Congestion Revenue Rights Estimated Aggregate Liability Components and Data Flow12/23/2020 09:51
Credit Management - Convergence Bidding Estimated Aggregate Liability Components and Data Flow12/23/2020 09:51

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Settlements technical documentation

Settlements and Billing Design Standard and Convention v5.2711/16/2022 11:16
Settlement Files Publication Contingency Provisions v2.16/02/2021 11:26
MRI - Settlements External User Guide v1.43/02/2023 13:19
MRI - Settlements FAQs v1.111/07/2012 16:10
Settlement Release Artifact Milestones9/23/2020 07:47
Settlements configuration file

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Reliability must run settlements

Settlement information for the annual agreements between the ISO and qualified generators.

RMR Invoice Template Version 3 (Effective Jun 1, 2013)6/12/2013 11:04
Prior Period Examples and Guidelines9/03/2002 13:37
Reliability must run administrative procedures

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Retroactive settlements

Recalculation settlements
Prior to trade date April 1, 2009

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Disputes

Dispute processes
Scheduling coordinators submit a settlement dispute to the California ISO using the online settlement dispute form in the web-based Customer Inquiry, Dispute and Information (CIDI) system.
- Methods of dispute submittal