ISO Logo
Market Notice
April 30, 2019


Action Date


Market Operations


System Operations

California ISO 2019 Q2 Full Network Model Implementation and Master File Data Freeze


The California ISO Full Network Model version 2019 Q2 implementation is scheduled for effective date Thursday, May 23, 2019.


The 2019 Q2 model version incorporates the addition or modification of new transmission, generation, and telemetry projects. The promotion process places limitations on the ability to process Master File data changes; therefore, the ISO will honor a data freeze as outlined below. Please note Master File data changes for registered cost updates will not be subject to this data freeze; however, these changes may not be effective from May 21 to 23, 2019. The submission of Use-Limited Plan Data Template (ULPDT) will not be impacted by the data freeze.


May 7, 2019

at 11 a.m.

(Pacific Time)

Deadline to submit changes that cannot be submitted through the Master File user interface (UI) or application programming interface (API) to to receive an effective date of May 15 or sooner. Effective dates of May 24 and later may also be requested.


May 8, 2019

Last day to submit changes through the Master File UI or API, same effective dates apply as above. Changes for registered cost updates are not subject to this deadline; however, these changes may not be effective from May 21 to 23.


May 9, 2019 -

May 21, 2019

UI/API submission black-out period; the ISO will decline submissions made on these dates, except the changes for registered cost updates, as this activity may interfere with the promotion process.


May 15, 2019

Last day changes can be made effective before the model promotion, for change requests received by dates listed above.


May 16, 2019 -

May 23, 2019

Effective date black-out period; no changes can be made, except the changes for registered cost updates, which can be made effective for May 17 or May 20.


May 22, 2019

Master File UI and API submissions may resume for effective dates on or after May 30.


May 30, 2019

Non-UI/API change requests submitted to after the May 7, 2019 deadline may request an effective date on or after May 30, 2019, subject to the 5 to 11 business day Master File change timeline.


Full Network Model questions:

Master File questions:

Engage with us!
isoball twitterball RSSball Facebookball YouTube
Daily Briefing
Sign up
Daily Briefing
ISO Today
ISO Today
Flex Alerts
Sign up
Flex Alerts

Glossary of terms and acronyms

California Independent System Operator | P.O. Box 639014 | Folsom, CA 95630 | United States