Stakeholder input is key to shaping market designs, policies, and infrastructure plans. Our stakeholder process is grounded in three principles:
Inclusivity. The ISO welcomes diverse ideas and perspectives, knowing that collaboration leads to stronger and mutually beneficial solutions.
Transparency. The ISO is committed to open, information-driven decision-making that fosters accountability with clear and transparent outcomes.
Trust. The ISO builds trust and understanding through meaningful dialogue, respectful engagement and consistent communication.
Learn more in the Stakeholder Process Guide.
To learn more about an initiative and find important documents and meeting materials, search or select from the list below.
To view the 2026 process timeline and policy initiative catalog, visit the 2026 Market policy catalog and roadmap process.
For an overarching view of where each initiative is in the development process, view the Policy Initiatives Timeline (updated weekly).
Learn how to use the commenting tool:
*Date is tentative
| Title | Status | Proposal Development | Decision | Implementation |
|---|---|---|---|---|
| Adjustment to intertie constraint penalty prices Nov 12, 2021 | Completed | Jan 21, 2022 Draft final proposal posted | Feb 09, 2022 Joint ISO Board of Governors and WEIM Governing Body approval |
Jun 01, 2022 Activation
Implementation milestones
|
| Aliso Canyon gas-electric coordination phase 1 Mar 23, 2016 | Completed | May 05, 2016 Revised draft final proposal posted |
Aug. 26, 2016 FERC approval May 09, 2016 Tariff amendment filing (ER16-1649) May 04, 2016 Board of Governors approval |
Jul 06, 2016 Activation
Jun 02, 2016 Activation |
| Aliso Canyon gas-electric coordination phase 2 Mar 23, 2016 | Completed | Sep 23, 2016 Draft final proposal posted |
Nov 28, 2016 and Mar 24, 2017 FERC approval Oct 14, 2016 Tariff amendment filing (ER17-110) Oct 3, 2016 Board of Governors approval |
Nov 30, 2016 Effective
|
| Aliso Canyon gas-electric coordination phase 3 Mar 23, 2016 | Completed | Jun 22, 2017 Draft final proposal posted |
Dec 15, 2017 FERC approval (ER18-375) Nov 28, 2017 FERC approval (ER17-2568) Dec 1, 2017 Tariff amendment filing (ER18-375) Sep 29, 2017 Tariff amendment filing (ER17-2568) Jul 26, 2017 Board of Governors approval |
Dec 16, 2017 Effective
Nov 30, 2017 Effective |
| Aliso Canyon gas-electric coordination phase 4 Mar 23, 2016 | Completed | Sep 17, 2018 Draft tariff language posted |
Feb. 8, 2019 FERC approval Sept. 28, 2018 Tariff amendment filing (ER18-2520) |
Dec 16, 2018 Effective
Nov 30, 2018 Effective |
| Aliso Canyon gas-electric coordination phase 5 Mar 23, 2016 | Completed | Oct 07, 2019 Draft tariff language posted |
Dec 31, 2019 FERC approval (ER20-273) Oct 31, 2019 Tariff amendment filing (ER20-273) |
May 20, 2021 Deployment
May 20, 2021 Activation |
| Ancillary service state of charge constraint Sep 19, 2022 | Completed |
Dec 14, 2022 BOG approval (Energy Storage Enhancements) Nov 18, 2022 FERC approval (ER22-2881) Sep 19, 2022 Tariff amendment (ER22-2881) |
Summer 2023
Implementation milestones
Jul 01, 2023 Activation, retroactive to TD 9/20/22 (Short-term fix) |
|
| Billing, payment and credit enhancements Sep 26, 2023 | Active |
Sep 26, 2023 Issue paper and draft final proposal Sep 05, 2024 Draft tariff language posted |
Phase 1 Nov 08, 2023 Joint ISO Board of Governors and WEM Governing Body approval |
|
| Capacity procurement mechanism enhancements Jul 27, 2022 | Completed |
Track 2 Sep 21, 2023 Board of Governors meeting Track 1 Jan 11, 2023 Final proposal posted |
Track 1 Mar 12, 2023 Board of Governors approval |
|
| Capacity procurement mechanism soft offer cap Jun 17, 2019 | Completed |
Jan 06, 2020 Draft Final Proposal |
May 29, 2020 Letter Order Accepting Tariff Revisions to Capacity Procurement Mechanism - Soft Offer Cap (ER20-1075) Feb 25, 2020 Tariff Amendment Capacity Procurement Mechanism Soft Offer Cap (ER20-1075) |
|
| Central procurement entity implementation Nov 11, 2021 | Completed | Feb 16, 2022 Final proposal posted |
Jul 01, 2022 FERC approval (ER22-1604) Apr 08, 2022 Tariff amendment filing (ER22-1604) Mar 17, 2022 ISO Board of Governors approval |
Oct 12, 2022 Master File / CIRA activation
Implementation milestones
Jan 01, 2022 Effective date for 2023 Resource Adequacy year. |
| Clarifications to reliability must-run designation process Aug 09, 2021 | Completed | Dec 17, 2021 Board of Governors (information report only) | ||
| Commitment cost enhancements tariff clarifications Dec 10, 2019 | Completed |
Jan 28, 2020 Draft tariff language Jan 28, 2020 Draft final proposal |
Jun 30, 2020 FERC Order (ER20-1592) Mar 25, 2020 Board of Governors approval |
Oct 01, 2020 Deployment
|
| Commitment costs and default energy bid enhancements Nov 22, 2016 | Completed |
May 13, 2020 Revised draft tariff language Aug 30, 2017 Draft final proposal |
Dec 28, 2020 Order accepting compliance filing (ER19-2727) Dec 28, 2020 Order accepting compliance filing (ER20-2360) Sep 21, 2020 FERC approval (ER20-2360) Jul 09, 2020 Tariff amendment filing (ER20-2360) Sep 05, 2019 Tariff amendment filing (ER19-2757) Aug 30, 2019 Tariff amendment filing (ER19-2727) Mar 22, 2018 Board of Governors approval Mar 08, 2018 EIM Governing Body briefing |
Jan 2021 Deployment
Jan 2021 Activation |
| Congestion revenue rights auction efficiency Apr 18, 2017 | Completed |
Sep 27, 2018 Second revised draft tariff language (track 1B) Mar 28, 2018 Revised draft tariff language (track 1A) |
Track 1B Modification Nov 09, 2018 FERC approval Track 1B Sep 20, 2018 FERC approval Jun 21, 2018 Board of Governors approval Track 1A Sep 07, 2018 FERC approval Mar 22, 2018 Board of Governors approval |
Nov 01, 2018 Deployment (Track 1A)
|
| Congestion revenue rights enhancements Sep 26, 2024 | Active |
Dec 12, 2025 Issue paper and straw proposal on product definition posted Jan 14, 2026 Issue paper on revenue adequacy and auction efficiency posted Jan 21, 2026 Meeting Feb 04, 2026 Comments due |
||
| Contingency modeling enhancements Mar 26, 2013 | Completed | Aug 22, 2017 Draft final proposal posted | Dec 14, 2017 Board of Governors approval | |
| Contract management enhancements 2021 Aug 09, 2021 | Completed |
Mar 25, 2022 FERC approval (ER22-878) Jan 25, 2022 Tariff amendment filing (ER22-878) Dec 17, 2021 Board of Governors approval |
||
| Day-ahead market enhancements Jun 19, 2018 | Active |
Jul 11, 2023 Revised draft tariff language posted May 01, 2023 Revised final proposal posted |
Dec 20, 2023 FERC approval (ER23-2686) Aug 22, 2023 Tariff amendment (ER23-2686) May 17, 2023 Joint WEM Governing Body and ISO Board of Governors approval |
Dec 18, 2025 Configurable Parameters working group
Implementation milestones
Jan 08, 2026 Comments due Jan 29, 2026* Configurable Parameters working group Feb 26, 2026* Configurable Parameters working group Mar 26, 2026* Configurable Parameters working group May 01, 2026 Activation Dec 23, 2024 Day-Ahead Market Enhancements - BRS posted |
| Day-ahead market enhancements archive phase 1 Mar 07, 2018 | Closed | May 02, 2019 Meeting | ||
| Day-ahead market enhancements archive phase 2 Mar 07, 2018 | Closed | May 02, 2019 Meeting | ||
| Day-ahead sufficiency Nov 15, 2023 | Active | Jan 14, 2025 Draft final proposal posted | ||
| Demand and distributed energy market integration Jan 08, 2025 | Active | |||
| Dispatch operating target tariff clarification Apr 13, 2018 | Completed | Aug 22, 2018 Third revised draft tariff language posted |
Oct 29, 2018 FERC approval (ER18-2380) Sep 05, 2018Tariff amendment (ER18-2380) Jul 26, 2018 Board of Governors briefing |
Dec 2020 Deployment
Feb 2021 Activation |
| Energy storage and distributed energy resources phase 1 Aug 27, 2015 | Completed |
Dec 23, 2015 Revised draft final proposal posted |
Aug 16, 2016 FERC approval (ER16-1735) Feb 03, 2016 Board of Governors approval |
Nov 01, 2016 Deployment
|
| Energy storage and distributed energy resources phase 2 Aug 27, 2015 | Completed | Jun 12, 2017 Draft final proposal posted |
Oct 24, 2018 FERC approval (ER18-2242) Jul 26, 2017 Board of Governors approval |
Nov 01, 2018 Activation
|
| Energy storage and distributed energy resources phase 3 Aug 27, 2015 | Completed | Jul 26, 2018 Revised draft final proposal posted |
Jul 16, 2020 FERC approval phase 3B (ER20-2443) Nov 6, 2019 FERC approval phase 3A (ER19-2733) Sep 5, 2018 Board of Governors approval Aug 22, 2019 EIM Governing Body briefing |
Oct 01, 2020 Activation phase 3B
Nov 2019 Activation phase 3A |
| Energy storage and distributed energy resources phase 4 Aug 27, 2015 | Completed |
Sep 22, 2020 Default energy bid proposal posted Aug 27, 2020 Final proposal posted |
Oct 29, 2021 FERC approval phase 4 (ER21-2779) Mar 19, 2021 Tariff amendment (ER21-1487) Dec 17, 2020 Board of Governors approval - default energy bid proposal Sep 30, 2020 Board of Governors approval - final proposal |
Oct 01, 2021 Deployment
Oct 2021 Activation |
| Energy storage enhancements Feb 01, 2021 | Completed |
Oct 02, 2023 Workshop paper posted Mar 15, 2023 Revised draft tariff language posted Oct 27, 2022 Final proposal posted |
Nov 03, 2023 - Informational filing of effective date track 1 and track 2 (ER23-2537 and ER23-1533) Sep 29, 2023 FERC approval (ER23-2537) Aug 01, 2023 Tariff amendment track 2 (ER23-2537) Jul 17, 2023 Information filing effective date (ER23-1533) Jun 01, 2023 FERC approval (ER23-1533) Mar 31, 2023 Tariff amendment (ER23-1533) Dec 14, 2022 ISO Board of Governors and WEIM Governing Body approval |
Summer 2023 Track 1
Implementation milestones
Jul 01, 2023 Activation Fall 2023 Track 2 Nov 01, 2023 Activation |
| Excess behind the meter production Jul 10, 2018 | Completed |
Dec 02, 2019 Revised draft tariff language Dec 19, 2018 Draft final proposal |
Dec 23, 2020 FERC approval (ER21-190) Oct 23, 2020 Tariff amendment filing (ER21-190) May 15, 2019 Board of Governors approval |
Oct 01, 2020 Deployment
Jan 2021 Activation |
| Extended day-ahead market Oct 03, 2019 | Active |
Dec 11, 2025 EDAM Congestion Revenue Allocation Phase 2 working group Jan 16, 2026 Comments due Jun 24, 2025 Final tariff language posted Jun 11, 2025 Draft tariff language posted Jun 06, 2025 Congestion Revenue Allocation final proposal posted Mid-April 2024 EDAM access charge FERC filing Jul 25, 2023 Revised draft tariff language posted Dec 07, 2022 Final proposal posted |
Aug 29, 2025 EDAM - Congestion Revenue Allocation FERC approval (ER25-2637) Jun 19, 2025 EDAM - Congestion Revenue Allocation: ISO Board and WEM Governing Body approval Jun 11, 2024 EDAM Access Charge FERC approval (ER24-1746) Dec 20, 2023 FERC approval (ER23-2686) Aug 22, 2023 Tariff amendment (ER23-2686) Feb 01, 2023 ISO Board of Governors and WEIM Governing Body joint approval |
Dec 15, 2025 Intertie Scheduling EDAM Implementation Workshop
Implementation milestones
Feb 27, 2026 Comments due for FAQ document May 01, 2026 Activation |
| Extended day-ahead market ISO balancing authority area participation rules Mar 20, 2023 | Active |
Oct 11, 2023 Revised draft tariff language posted Aug 15, 2023 Track A1 final proposal posted |
Track A1 Nov 13, 2023 Tariff amendment (ER24-379) Sep 21, 2023 ISO Board of Governors approval |
Jan 29, 2025 - Mar 07, 2025 BRS review
Implementation milestones
Nov 07, 2024 Tariff language May 01, 2026 Activation |
| Extended day-ahead market: working group 1 - supply commitment and resource sufficiency evaluation Dec 10, 2021 | Completed | Policy documents are located on the Extended Day-Ahead Market Initiative webpage. | ||
| Extended day-ahead market: working group 2 - transmission commitment and congestion rent allocation Dec 13, 2021 | Completed | Policy documents are located on the Extended Day-Ahead Market Initiative webpage. | ||
| Extended day-ahead market: working group 3 - greenhouse gas accounting and costs Dec 13, 2021 | Completed | Policy documents are located on the Extended Day-Ahead Market Initiative webpage. | ||
| FERC Order 831 - Import bidding and market parameters May 16, 2019 | Completed |
Jan 28, 2021 Second revised draft tariff language posted Sep 10, 2020 Revised final proposal posted |
Jun 17, 2021 Informational filing (ER21-1192) Apr 27, 2021 FERC approval (ER21-1192) Feb 22, 2021 Tariff amendment (ER21-1192) Feb 22, 2021 FERC approval (ER21-1164) Feb 18, 2021 Notice of withdrawal (ER19-2757) Feb 17, 2021 Tariff amendment (ER21-1164) Dec 11, 2020 FERC approval (ER19-2757) Oct 01, 2020 Board of Governors approval Sep 21, 2020 FERC approval (ER19-2757) Sep 05, 2019 Tariff amendment (ER19-2757) |
Jun 2021 Deployment
Jun 2021 Activation |
| FERC Order No. 881 - managing transmission line ratings phase 1 May 06, 2022 | Active |
Jun 23, 2022 Revised draft tariff language posted |
Apr 20, 2023 FERC approval (ER22-2362) Jul 12, 2022 Compliance filing (ER22-2362) |
|
| FERC Order No. 881 - managing transmission line ratings phase 2 May 06, 2022 | Active |
Apr 30, 2025 FERC approval of implementation delay (ER22-2362) Jun 16, 2023 Compliance Filing (ER22-2362) |
Apr 01, 2024 - track 1
Implementation milestones
Q4 2024 - track 2 |
|
| Flexible ramping product refinements Nov 21, 2019 | Completed |
Aug 03, 2022 Draft tariff language posted Aug 31, 2020 Final proposal posted |
Oct 18, 2022 FERC approval (ER22-2661) Aug 15, 2022 Tariff amendment filing (ER22-2661) Jul 20, 2022 - Joint EIM Governing Body and Board of Governors approval Sep 30 - Oct 01, 2020 Board of Governors approval Sep 16, 2020 EIM Governing Body approval |
Deliverability:
Feb 01, 2023 Activation Buffer and minimum: Nov 2020 Deployment Nov 2020 Activation |
| Frequency response phase 1 Dec 22, 2016 | Completed |
Mar 17, 2016 Draft tariff language Feb 11, 2016 Draft final proposal |
Feb 02, 2017 FERC approval Apr 21, 2016 Tariff amendment filing (ER16-1483) Mar 25, 2016 Board of Governors approval |
Sep 30, 2016 Deployment
|
| Frequency response phase 2 Dec 22, 2016 | Closed | Will resume in 2020 | ||
| Gas resource management Jul 14, 2023 | Active |
Sep 17, 2025 Draft final proposal posted |
Dec 2025* WEM Governing Body meeting | |
| Generation deliverability assessment May 02, 2019 | Completed |
Dec 10, 2019 Revised draft tariff language Oct 30, 2019 Revised draft final proposal |
Sep 11, 2020 FERC approval (ER20-732) Jun 03, 2020 Compliance filing (ER20-732) May 19, 2020 FERC approval (ER20-732) Feb 28, 2020 Deficiency letter (ER20-732) Jan 02, 2020 Tariff amendment (ER20-732) Nov 13, 2019 Board of Governors approval |
|
| Generation deliverability methodology review Dec 12, 2022 | Completed |
Jan 16, 2024 Initiative complete; moving to implementation
Implementation milestones
|
||
| Greenhouse gas coordination Jul 14, 2023 | Active | Oct 15, 2025 Final proposal posted | ||
| Hybrid resources phase 1 Jul 22, 2019 | Completed |
May 07, 2020 Second revised straw proposal posted Jul 10, 2020 Revised draft tariff language posted |
Nov 19, 2020 FERC approval (ER20-2890) Jul 22, 2020 Board of Governors approval Jun 30, 2020 EIM Governing Body briefing |
Dec 2020 Activation and Deployment
Implementation milestones
Oct 2022 Implementation - Phase 1 |
| Hybrid resources phase 2 Jul 22, 2019 | Completed |
Jan 04, 2024 Revision - Add 4 market simulation business requirements Sep 09, 2021 Third revised draft tariff language (phase 2b) posted Dec 28, 2020 Revised draft tariff language (phase 2a) posted |
Nov 30, 2021 FERC approval (phase 2b) (ER21-2853) Jul 15, 2021 Board of Governors approval (aggregate capability constraint) Mar 09, 2021 FERC approval (phase 2a) (ER21-843) Nov 18, 2020 Board of Governors approval Nov 04, 2020 EIM Governing Body briefing |
Phase 2c RIMS: Oct 01, 2023 Activation
Implementation milestones
Phase 2c TieGen: Jul 01, 2023 Activation Phase 2c RIMS: Apr 09, 2025 Activation Phase 2b Feb 01, 2023 Implementation Phase 2a Oct 01, 2021 Deployment Oct 2021 Activation |
| Imbalance Reserves Mosaic Parameter Requirements Oct 23, 2024 | Active | |||
| Inter-SC trades in regional markets Aug 02, 2024 | Active |
Sep 20, 2024 Draft tariff language posted Sep 26, 2024 Presentation to ISO Board of Governors and WEM Governing Body |
Dec 23, 2024 FERC approval (ER25-94) Nov 05, 2024 Answer to comments (ER25-94) Oct 15, 2024 Tariff amendment (ER25-94) Sep 26, 2024 Joint Board of Governors and Governing Body approval |
|
| Interconnection process enhancements Jan 24, 2018 | Completed |
Sep 19, 2018 Revised draft tariff language Dec 21, 2018 Second addendum to draft final proposal |
Oct 18, 2019 FERC approval (ER19-2679) Aug 23, 2019 Tariff amendment filing, 5 items (ER19-2679) Feb 19, 2019 FERC approval 15 items (ER18-2498) Feb 07, 2019 Board of Governors approval 4 items Nov 14, 2018 Board of Governors approval 4 items Sep 27, 2018 Tariff amendment (ER18-2498) Sep 05, 2018 Board of Governors approval 8 items Jul 26, 2018 Board of Governors approval 7 items |
Oct. 23, 2019 Tariff revisions effective (ER19-2679)
Nov 27, 2018 Tariff revisions effective (ER18-2498) |
| Interconnection process enhancements 2021 phase 1 Sep 30, 2021 | Completed | Apr 21, 2022 Final proposal posted |
Aug 31, 2022 FERC approval (ER22-2018) Jun 02, 2022 Tariff amendment filing (ER22-2018) May 12, 2022 Board of Governors approval |
Deliverability: Sep 01, 2022
Implementation milestones
|
| Interconnection process enhancements 2021 phase 2 Sep 30, 2021 | Completed |
Dec 20, 2022 Draft tariff revisions posted Sep 20, 2022 Final proposal posted |
Mar 27, 2023 FERC approval (ER23-941) Jan 26, 2023 Tariff amendment (ER23-941) Oct 25-26, 2022 Board of Governors approval |
|
| Interconnection process enhancements 2023 Feb 27, 2023 | Active |
Track 3 Jan 09, 2025 Draft final proposal posted Feb 19, 2025 Final proposal posted Track 2 Feb 15, 2024 Draft final proposal posted Mar 29, 2024 Final proposal posted Track 1 Apr 13, 2023 Final proposal posted |
Track 3 Apr 25, 2025 FERC approval (ER25-2044) Mar 26, 2025 Board of Governors approval Track 2 Oct 17, 2024 FERC approval (ER25-131) Jun 12, 2024 Board of Governors approval Track 1 Aug 01, 2023 FERC approval (ER23-2058) May 17, 2023 Board of Governors approval |
|
| Interconnection process enhancements 5.0 Jul 08, 2025 | Active |
Oct 13, 2025 Draft final proposal posted Dec 22, 2025 Final proposal posted Jan 21, 2026 Comments due Mar 05, 2026 Board of Governors meeting |
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| Intertie deviation settlement Aug 22, 2018 | Completed |
Mar 18, 2019 Draft tariff language Feb 13, 2019 Draft final proposal |
Mar 31, 2021 Order accepting compliance filing (ER20-1890) Feb 3, 2021 Compliance filing (ER20-1890) Feb 1, 2021 Order granting waiver and dismissing compliance filing (ER20-1890) Dec 08, 2020 Order accepting compliance filing (ER20-1890) Sep 29, 2020 Compliance filing (ER20-1890) Sep 17, 2020 FERC approval (ER20-1890) Feb 07, 2019 Board of Governors approval Jan 24, 2019 EIM Governing Body briefing |
Feb 01, 2021 Deployment
Feb 08, 2021 Activation |
| Local capacity technical study criteria update May 30, 2019 | Completed |
Nov 05, 2019 Draft tariff language Sep 03, 2019 Draft final proposal |
Jan 17, 2020 FERC approval (ER20-548) Dec 09, 2019 Tariff amendment filing (ER20-548) Nov 13, 2019 Board of Governors approval |
|
| Local market power mitigation enhancements 2018 Apr 30, 2019 | Completed |
May 24, 2019 Revised draft tariff language Feb 01, 2019 Draft final proposal |
Nov 20, 2019 Local Market Power Mitigation Enhancements Effective Date Notification (ER19-2347) Sep 30, 2019 FERC approval (ER19-2437) Jul 02, 2019 Tariff amendment filing (ER19-2347) Mar 27, 2019 Board of Governors approval Mar 12, 2019 EIM Governing Body approval |
Nov 13, 2019 Deployment
Nov 2019 Activation |
| Market enhancements for summer 2021 readiness Dec 22, 2020 | Completed |
Apr 23, 2021 Second revised draft tariff language posted** Apr 15, 2021 Revised final proposal posted (includes all topics) Mar 10, 2021 Revised draft tariff language posted* *Topics include market incentives for imports; real-time scarcity pricing enhancements; reliability demand response dispatch and real-time price impacts; and independent study interconnection enhancements **Load, export and wheeling priorities topic only |
Aug 11, 2021 Informational filing (ER21-1790) Jun 25, 2021 FERC approval (ER21-1790) May 25, 2021 FERC approval (ER21-1536) Apr 28, 2021 Tariff Amendment (ER21-1790)** Apr 23, 2021 Tariff Amendment (ER21-1536)* Apr 21, 2021 Board of Governors approval** Apr 19, 2021 EIM Governing Body approval** Mar 26, 2021 Tariff Amendment (ER21-1536)* Mar 24-25, 2021 Board of Governors approval* Mar 10, 2021 EIM Governing Body approval* |
Load, export and wheeling priorities only:
Aug 2021 Deployment Aug 2021 Activation Jun 01, 2021 Deployment Jun 2021 Activation |
| Market parameter changes enhancement Apr 19, 2022 | Completed |
Mar 14, 2023 Revised final proposal posted |
Oct 19, 2023 Tariff amendment filing approved (ER23-2020) May 31, 2023 Tariff amendment filing (ER23-2020) Mar 22, 2023 Board of Governors approval |
Independent release 2023
Implementation milestones
|
| Market settlement timeline Jun 13, 2019 | Completed |
Sep 23, 2019 Draft final proposal |
Nov 13, 2019 Board of Governors approval Oct 30, 2019 EIM Governing Body briefing Oct 02, 2020 FERC approval (ER20-2617) |
Dec 2020 Deployment
Jan 2021 Activation |
| Maximum import capability enhancements phase 1 Mar 10, 2021 | Completed |
Oct 11, 2021 Final proposal posted |
Nov 03, 2021 Board of Governors approval |
Fall 2023*
Implementation milestones
|
| Maximum import capability enhancements phase 2 Mar 10, 2021 | Closed | |||
| Maximum import capability stabilization and multi-year allocation Dec 03, 2019 | Completed |
Feb 09, 2021 Revised draft tariff language posted Jul 14, 2020 Draft final proposal posted |
Apr 23, 2021 FERC approval (ER21-1469) Mar 18, 2021 Tariff amendment filing (ER21-1469) Oct 01, 2020 Board of Governors approval |
Jun 01, 2021 Effective
|
| Minimum state of charge extension Jan 25, 2023 | Completed | Mar 06, 2023 Final proposal posted |
May 25, 2023 FERC approval (ER23-1485) Mar 28, 2023 Tariff amendment (ER23-1485) Mar 22, 2023 ISO Board of Governors and WEIM Governing Body approval |
FERC approved extension through Sep 30, 2023
Implementation milestones
|
| Penalty enhancements - demand response, investigation, and tolling Feb 20, 2024 | Completed |
Dec 30, 2024 Informational filing effective date (ER25-54) Dec 23, 2024 Letter order accepting tariff amendment (ER25-54) Nov 07, 2024 Answer to comments (ER25-54) Oct 08, 2024 Tariff amendment (ER25-54) Sep 26, 2024 Joint Board of Governors and Governing Body approval |
Jan 06, 2025 Effective date
Implementation milestones
|
|
| Planning standards - remedial action scheme guidelines update Jun 15, 2021 | Completed | Dec 15, 2022 Draft final proposal posted | Feb 02, 2023 Board of Governors approval | |
| Price formation enhancements phase 1 Apr 11, 2022 | Completed |
Jul 31, 2024 Order accepting tariff amendment (ER24-2168) Jul 08, 2024 Answer to comments (ER24-2168) May 31, 2024 Tariff amendment filing (ER24-2168) |
Nov 14, 2024 PRR 1591 updates to the hourly energy shaping factor
Implementation milestones
Jul 11, 2024 Training Aug 01, 2024 Production |
|
| Price formation enhancements phase 2 Apr 11, 2022 | Active | |||
| Proxy demand resource - resource adequacy clarifications Mar 27, 2020 | Completed | Apr 28, 2020 Final proposal |
Nov 23, 3030 FERC approval (ER20-2922) Jul 22, 2020 Board of Governors approval |
Nov 2020
|
| Pseudo-ties of shared resources May 07, 2020 | Completed | Oct 30, 2020 Third revised draft tariff language posted |
Jan 29, 2021 FERC approval (ER21-447) Nov 18, 2020 Board of Governors approval Nov 04, 2020 EIM Governing Body briefing |
April 2021
|
| Real-time market neutrality settlement May 01, 2019 | Completed | Apr 25, 2019 Issue paper/straw proposal posted |
Sep 06, 2019 FERC approval Jul 30, 2019 Tariff amendment filing (ER19-2497) Jul 24, 2019 Board of Governors consent Jun 28, 2019 EIM Governing Body approval |
Nov 13, 2019 Deployment
Nov 2019 Activation |
| Real-time settlement review Aug 13, 2020 | Completed | Oct 21, 2020 Draft final proposal posted |
Apr 30, 2021 FERC approval in part/rejection in part (ER21-955) Mar 25, 2021 Amendment to filing (ER21-955) Jan 27, 2021 Tariff amendment filing (ER21-955) Dec 17, 2020 Board of Governors approval Dec 02, 2020 EIM Governing Body approval (settlement rule changes) |
Phase 2:
Nov 01, 2021 Deployment Nov 2021 Activation Phase 1: May 01, 2021 Deployment May 2021 Activation |
| Reliability demand response resource bidding enhancements phase 1 Oct 28, 2021 | Completed |
Jan 26, 2022 Draft final proposal posted - track 1 |
May 24, 2022 FERC approval (ER22-1431) Mar 23, 2022 Tariff amendment filing (ER22-1431) Mar 16, 2022 ISO Board of Governors and WEIM Governing Body joint approval - track 1 |
Jun 01, 2022 Effective - track 1
Implementation milestones
|
| Reliability demand response resource bidding enhancements phase 2 Oct 28, 2021 | Completed | Apr 12, 2022 Final proposal posted - track 2 |
Oct 24, 2022 FERC approval (ER22-2700) Aug 22, 2022 Tariff amendment filing (ER22-2700) Jul 20, 2022 Board of Governors and WEIM Governing Body approval - track 2 |
Nov 3, 2022
Implementation milestones
|
| Reliability must-run and capacity procurement mechanism enhancements Jan 30, 2018 | Completed |
Apr 03, 2019 Third revised draft tariff language posted Jan 23, 2019 Draft final proposal posted |
Oct 28, 2019 Compliance filing (ER19-1641) Sep 27, 2019 FERC approval Apr 22, 2019 Tariff amendment filing (ER19-1641) Mar 27, 2019 Board of Governors approval |
Nov 13, 2019 Deployment
Jan 2020 Activation |
| Resource adequacy enhancements phase 1 Oct 30, 2018 | Completed |
Mar 25, 2021 Revised draft tariff language posted Feb 17, 2021 Final proposal posted |
May 28, 2021 FERC approval (ER21-1551) Mar 29, 2021 Tariff amendment (ER21-1551) Mar 24, 2021 Board of Governors approval |
Jun 01, 2021 Deployment
Jun 2021 Activation |
| Resource adequacy enhancements phase 2 Oct 30, 2018 | Completed |
|
Fall 2023
|
|
| Resource adequacy modeling and program design Aug 07, 2023 | Active |
Jan 06, 2026 Tracks 1 and 3A - draft tariff language posted Sep 26, 2025 Track 1 final proposal posted Oct 03, 2025 Track 3A final proposal posted Jan 05, 2026 - Draft tariff language posting Jan 19, 2025 - Comments due Jan 26, 2025 - Meeting |
Tracks 1 and 3A Oct 30, 2025 Board of Governors approval Track 2 2026* Board of Governors meeting |
|
| Rules of conduct enhancements May 23, 2023 | Completed |
Track 1 Nov 16, 2023 Revised draft tariff language posted Aug 02, 2023 Draft final proposal posted |
Track 1 Sep 20, 2023 ISO Board of Governors and WEIM Governing Body joint approval Jan 12, 2024 FERC filed ( ER24-872) Apr 02, 2024 FERC approved effective date (ER24-872) Oct 08, 2024 FERC approved effective date (ER24-54) |
Track 1
Implementation milestones
Apr 01, 2024 Implementation Nov 05, 2024 PRR 1600 |
| Short-long start unit definitions update Jan 19, 2022 | Completed |
Feb 17, 2022 Draft final proposal posted Jan 01, 2022 Revised draft tariff language posted |
May 23, 2022 FERC approval (ER22-1438) Mar 24, 2022 Tariff amendment (ER22-1438) Mar 16, 2022 ISO Board of Governors and WEIM Governing Body approval |
Jun 01, 2022 Activation
Implementation milestones
|
| Storage as a transmission asset Apr 06, 2018 | Closed | |||
| Storage bid cost recovery and default energy bids enhancements Jun 27, 2024 | Completed |
Nov 18, 2024 Revised draft tariff language posted Oct 31, 2024 Final proposal posted |
Jan 24, 2025 FERC order accepting tariff revisions Nov 26, 2024 Tariff amendment to prevent unwarranted bid cost recovery payments to storage resources, and request for effective date on shortened notice (ER25-376) Nov 07, 2024 Joint Board of Governors and WEM Governing Body approval |
Dec 01, 2024 Effective date
Implementation milestones
Mar 19, 2025 BRS comments due |
| Storage design and modeling Nov 25, 2024 | Active |
Jan 22, 2025* Meeting Jan 31, 2025* Issue paper and straw proposal on Mixed-Fuel and Distribution-Level Resources posting |
||
| Subscriber participating transmission owner market scheduling options Nov 01, 2024 | Active |
Mar 13, 2025 Draft final proposal posted Apr 24, 2025 Final proposal posted May 15, 2025 Draft tariff language posted May 28, 2025 Final tariff language posted |
Aug 08, 2025 FERC approval (ER25-2442) Jun 06, 2025 Tariff amendment filing (ER25-2442) May 22, 2025 ISO Board of Governors approval |
|
| Subscriber participating transmission owner model Jan 11, 2023 | Active |
Jun 22, 2023 Final proposal posted Aug 8, 2023 Revised draft tariff language posted |
Jul 20, 2023 Board of Governors approval | |
| System market power mitigation Dec 16, 2019 | Closed | |||
| test Oct 05, 2023 | Closed | |||
| Transmission access charge structure enhancements Jun 30, 2017 | Completed |
Sep 17, 2018 Draft final proposal posted |
||
| Transmission service and market scheduling priorities phase 1 May 20, 2021 | Completed |
Jan 11, 2022 Revised draft tariff language posted Dec 10, 2021 Draft final proposal posted |
Mar 15, 2022 FERC approval (ER22-906) Jan 27, 2022 Tariff amendment (ER22-906) Jan 20, 2022 Board of Governors approval - phase 1 |
Spring 2022
Implementation milestones
|
| Transmission service and market scheduling priorities phase 2 May 20, 2021 | Completed |
Track 1 Oct 30, 2023 FERC approval (ER23-2510) Jul 28, 2023 Tariff amendment (ER23-2510) Feb 01, 2023 Board of Governors approval - phase 2 |
Monthly: Apr 17, 2024 Activation
Implementation milestones
Daily: Jun 01, 2024 Activation Transmission service and market scheduling priorities BRS review |
|
| Variable operations and maintenance cost review Dec 19, 2019 | Completed |
Jan 25, 2021 Revised draft tariff language posted Oct 22, 2020 Final proposal posted |
May 12, 2021 FERC approval (ER21-1266) Mar 03, 2021 Tariff amendment (ER21-1266) Nov 18, 2020 Board of Governors approval |
Oct 01, 2021 Deployment
Oct 2021 Activation |
| Variable operations and maintenance cost review 2023 Jul 17, 2023 | Completed |
Aug 23, 2023 Final proposal posted Aug 23, 2023 Draft tariff language posted |
Nov 21, 2023 FERC approval (ER23-2956) Sep 28, 2023 Tariff amendment (ER23-2956) Sep 20, 2023 Board of Governors approval |
Dec 1, 2023 Activation
Implementation milestones
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| Washington WEIM greenhouse gas enhancements Aug 09, 2022 | Completed |
Oct 21, 2022 Draft tariff language posted Sep 22, 2022 Draft final proposal posted |
Jun 02, 2023 FERC filing (ER23-2062) Apr 20, 2023 FERC approval of compliance filing (ER23-474) Mar 13, 2023 Compliance filing (ER23-474) Feb 10, 2023 FERC approval (ER23-474) Dec 19, 2022 Motion for leave to file answer and answer (ER23-474) Nov 21, 2022 Tariff amendment (ER23-474) Oct 25-26, 2022 Joint ISO Board of Governors and WEIM Governing Body approval |
Interim solution effective May 01, 2023
Implementation milestones
Full implementation: Nov 01, 2023 |
| WEIM - Assistance Energy Transfer (AET) Extension Apr 08, 2025 | Active |
Jul 22, 2025 WEM Governing Body primary authority Jul 23, 2025 ISO Board of Governors consent agenda |
Jul 22, 2025 WEM Governing Body approval | |
| WEIM governance review phase 1 Dec 14, 2018 | Completed |
May 21, 2019 Draft final proposal posted Jun 18, 2019 Addendum to draft final proposal posted Jun 18, 2019 Revised draft final charter posted |
May 21, 2019 EIM Governing Body approval | |
| WEIM governance review phase 2 Dec 14, 2018 | Completed |
Sep 28, 2021 - Proposed amendment to corporate bylaws: advisory committees posted Aug 09, 2021 - Part one final proposal posted |
Sep 23, 2021 Board of Governors approval (part two governance documents) Sep 08, 2021 EIM Governing Body approval (governance documents) Aug 20, 2021 Joint Board of Governors and EIM Governing Body approval (part two draft final proposal) May 06, 2021 Joint ISO Board of Governors and EIM Governing Body approval (part one draft final proposal) |
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| WEIM governance review phase 3 Dec 14, 2018 | Completed | Dec 7, 2022 EDAM governance draft final proposal posted | Feb 01, 2023 Joint WEIM Governing Body and ISO Board of Governors approval | |
| WEIM resource sufficiency evaluation enhancements May 25, 2021 | Completed |
Mar 21, 2023 Revised final draft tariff language posted Nov 07, 2022 Revised final proposal posted |
Mar 31, 2023 Tariff amendment filing (ER23-1534) Dec 14, 2022 Joint WEIM Governing Body and Board of Governors approval Sep 14, 2022 FERC Order accepting compliance filing (ER22-1278) Jun 07, 2022 Compliance filing (ER22-1278) May 27, 2022 FERC approval (ER22-1278) Mar 11, 2022 Tariff amendment filing (ER22-1278) Feb 09, 2022 ISO Board of Governors approval - phase 1 Feb 02, 2022 Market Surveillance Committee opinion adopted - phase 1 |
Jun 01, 2022 - Phase 1
Implementation milestones
Jul 01, 2023 - Phase 2 track 1 Jun 01, 2024 - Phase 2 track 2 |
| WEIM sub-entity scheduling coordinator role Nov 03, 2020 | Closed |
Jun 02, 2021 Revised draft tariff language and agreements posted Mar 18, 2021 Draft final proposal posted |
Mar 31, 2022 FERC approval (ER22-869) Jan 21, 2022 Tariff amendment filing (ER22-869) Sep 08, 2021 EIM Governing Body approval Sep 22-23, 2021 Board of Governors approval (consent agenda) |
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| West-wide governance pathways - step 1 Jun 05, 2024 | Active |
Apr 02, 2025 FERC Approval of associated tariff changes (ER25-542) Nov 22, 2024 Tariff amendment (ER25-542) Aug 13, 2024 Board of Governors and Governing Body Joint Approval |
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| Western EIM base schedule submission deadline phase 1 Sep 23, 2020 | Completed |
Nov 05, 2020 Draft final proposal posted Dec 11, 2020 Revised draft tariff language posted |
Sep 25, 2023 FERC approval (ER23-2505) Jul 28, 2023 Removal of submission deadline revisions (ER23-2505/ER21-955) Jul 19, 2023 Joint ISO Board of Governors and WEIM Governing Body approval Apr 30, 2021 FERC approval in part/rejection in part (ER21-955) Mar 25, 2021 Amendment to tariff changes (ER21-955) Jan 27, 2021 Tariff amendment filing (ER21-955) Dec 17, 2020 Board of Governors approval Dec 02, 2020 Western EIM Governing Body approval |
Phase 2:
Spring 2022 Deployment Spring 2022 Activation Phase 1: May 01, 2021 Deployment May 2021 Activation |
| Western EIM base schedule submission deadline phase 2 Sep 23, 2020 | Closed |