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 and administrative charges

Many specific charge type categories are used within ISO settlements and invoice processes according to a Market Participant's involvement in the ISO Markets.

ISO Market Charge Codes Matrix11/14/2018 10:38
ISO RMR Payments Calendar Tool1/11/2018 10:33
Invoicing Schedule for Jan-Dec 2019 Monthly and 2020 Annual CRR Auctions12/10/2018 08:11
Invoicing Schedule for Jan-Dec 2018 Monthly and 2019 Annual CRR Auctions (updated)7/18/2018 16:30
California ISO Payments Calendar 201910/22/2018 15:33
California ISO Payments Calendar 201910/22/2018 15:33
California ISO Payments Calendar 201810/19/2017 15:35
California ISO Payments Calendar 201810/19/2017 15:35
ISO Settlement System Audit Report Jan 9, 20151/14/2015 11:15
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. This section contains current and historical GMC charge codes and rates and a sub section detailing the GMC unbundling process from 1998-2000.
Transmission access charge rates
Emissions and start-up costs
UFE estimation
Amendment 60 - must offer waiver denial reports
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 Credit7/09/2014 12:46
ISO Form Guaranty2/02/2011 13:31
Officer Certification Form2/01/2017 11:22
California ISO Credit Management Frequently Asked Questions FAQs12/27/2017 09:29

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Settlements technical documentation

Settlements technical documentation
- Settlements and Billing Design Standard and Convention v5.1611/14/2018 10:38
- MRI - Settlements External User Guide5/23/2018 11:57
- Settlement Files Publication Contingency Provisions v2.08/30/2016 15:21
- Settlement Release Artifact Milestones2/24/2015 16:28
- MRI - Settlements FAQs v1.111/07/2012 16:10
- Settlements configuration file
- Interface specifications
- API
- SFTP

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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