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August 23, 2019


Action Date



Market Operations


System Operations

California ISO 2019 Q3 Full Network Model Implementation and Master File Data Freeze


The California ISO Full Network Model version 2019 Q3 implementation is scheduled for effective date Sept. 19, 2019.


The 2019 Q3 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 Sept. 17-19, 2019. The submission of Use-Limited Plan Data Template (ULPDT) will not be impacted by the data freeze.


September 3, 2019

at 11:00 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 September 11 or sooner. Effective dates of September 20 and later may also be requested.


September 4, 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 September 17- 19.


September 5, 2019 – September 17, 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.


September 11, 2019

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


September 12, 2019 –

September 19, 2019

Effective date black-out period; no changes can be made, except the changes for registered cost updates, which can be made effective for September 13 or September 20.


September 18, 2019

Master File UI and API submissions may resume for effective dates on or after September 25.


September 25, 2019

Non-UI/API change requests submitted to after the Sept. 3, 2019, deadline may request an effective date on or after Sept. 25, 2019, subject to the 5 to 11 business day Master File change timeline.


Full Network Model questions:

Master File questions:

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