Project 2023-07 Transmission System Planning Performance Requirements for Extreme Weather

​​​​​​​​​​​Related Files​

Status
A formal comment period for draft three oTPL-008-1 – Transmission System Planning Performance Requirements for Extreme Temperature Events is open through 8 p.m. Eastern, Monday, October 21, 2024.​ 

​Additional ballots for the standard and implementation plan, as well as a non-binding poll of the associated Violation Risk Factors and Violation Severity Levels will be conducted October 11-21, 2024.

The Standards Committee approved waivers to the Standards Process Manual at their December 2023 meeting. These waivers were sought by NERC Standards for reduced formal comment and ballot periods to assist the drafting teams in expediting the standards development process due to firm timeline expectations set by FERC Order 896. 

Background

On June 15, 2023, FERC issued a Final Rulemaking to direct NERC to develop a new or modified Reliability Standard to address a lack of a long-term planning requirement(s) for extreme heat and cold weather events. Specifically, FERC directed NERC to develop modifications to Reliability Standard TPL-001-5.1 or a new Reliability Standard, to require the following: (1) development of benchmark planning cases based on major prior extreme heat and cold weather events and/or meteorological projections; (2) planning for extreme heat and cold weather events using steady state and transient stability analyses expanded to cover a range of extreme weather scenarios including the expected resource mix's availability during extreme heat and cold weather conditions, and including the wide-area impacts of extreme heat and cold weather; and (3) development of corrective action plans that mitigate any instances where performance requirements for extreme heat and cold weather events are not met.​ In addition, FERC directed “NERC to submit a new or modified Reliability Standard within 18 months of the date of publication of this final rule in the Federal Register," which equates to December 15, 2024.​

Standard Affected: TPL-001-5.1

Purpose/Industry Need
Consistent with FERC Order No. 896, the purpose of this project is to address the reliability gap pertaining to the consideration of extreme heat and cold weather events that exist in current transmission planning standards (e.g., NERC Reliability Standard TPL-001-5.1 – Transmission System Planning Performance Requirements).

Recent extreme weather events have shown the risk that such events can pose to the reliable operation of the BPS, and have highlighted the high risk to life and extreme economic impacts that can result from unplanned load shed during such conditions. The impact of concurrent failures of BPS generation and transmission equipment and the potential for cascading outages that may be caused by extreme heat and cold weather events should be studied and corrective actions should be identified and implemented.

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DraftActionsDatesResultsConsideration of Comments

Draft 3

TPL-008-1​

Clean | Redline to Last Posted

Implementation Plan​​

 

Supporting Materials

Technical Rationale​

Unofficial Comment Form​

VRF/VSL Justifications​

Consideration of FERC Order 896 Directives​

Informational Materials

TPL-008-1 ERO Benchmark Weather Event Develop​ment and Maintenance Process DRAFT​ 2

Benchmark Event Data

The below provides extreme heat and extreme cold benchmark temperature event data per the zones identified in Attachment 1 of the TPL-008-1 Standard. Should entities not agree with the data provided below, you are welcome to coordinate with all Planning Coordinators within your zone to developing one common extreme heat benchmark temperature event and one common extreme cold benchmark temperature event per Requirement R2. 

California Daily Data | California Top 40 Hottest/Coldest 3 Day Average | California Hourly Data Selected Events

Canada Central Daily Data | Canada Central Top 40 Hottest/Coldest 3 Day Average

Canada East Daily Data | Canada East Top 40 Hottest/Coldest 3 Day Average

Canada West Daily Data | Canada West Top 40 Hottest/Coldest 3 Day Average

ERCOT Daily Data | ERCOT Top 40 Hottest/Coldest 3 Day Average | ERCOT Hourly Data Selected Events

Florida Daily Data | Florida Top 40 Hottest/Coldest 3 Day Average | Florida Hourly Data Selected Events

Great Basin Daily Data | Great Basin Top 40 Hottest/Coldest 3 Day Average | Great Basin Hourly Data Selected Events

ISONE Daily Data | ISONE Top 40 Hottest/Coldest 3 Day Average | ISONE Hourly Data Selected Events

MISO Daily Data | MISO Top 40 Hottest/Coldest 3 Day Average​​​ | MISO Hourly Data Selected Events

NYISO Daily Data | NYISO Top 40 Hottest/Coldest 3 Day Average | NYISO Hourly Data Selected Events

Pacific NW Daily Data | Pacific NW Top 40 Hottest/Coldest 3 Day Average | Pacific NW Hourly Data Selected Events

PJM Daily Data | PJM Top 40 Hottest/Coldest 3 Day Average | PJM Hourly Data Selected Events

Rocky Mtn Daily Data | Rocky Mtn Top 40 Hottest/Coldest 3 Day Average | Rocky Mtn Hourly Data Selected Events

Southeast Daily Data | Southeast Top 40 Hottest/Coldest 3 Day Average | Southeast Hourly Data Selected Events

Southwest Daily Data | Southwest Top 40 Hottest/Coldest 3 Day Average | Southwest Hourly Data Selected Events

SPP Daily Data | SPP Top 40 Hottest/Coldest 3 Day Average | SPP Hourly Data Selected Events







Additional Ballot

Ballot Open Reminder​

Info

Vote​​







10/11/24 - 10/21/24






Comment Period


In​fo

Submit Comments​​






10/07/24 - 10/21/24​

Draft 2

TPL-008-1​

Clean | Redline to Last Posted

Implementation Plan​

 

Supporting Materials

Technical Rationale​

Unofficial Comment Form​

VRF/VSL Justifications

Consideration of FERC Order 896 Directives​


Informational Materials

Note: NERC is committed to providing additional information regarding the criteria used in the development of benchmark events. As a reminder, the items being balloted are the TPL-008-1 Reliability Standard and the Implementation Plan.

See FERC Order 896 Paragraph 35 regarding the directive for creation of benchmark events.

TPL-008-1 ERO Benchmark Weather Event Development and Maintenance Process DRAFT​

Benchmark Event Example​





Additional Ballot

Ballot Open Reminder​

Info

Vote





8/13/24 - 8/22/24



Ballot Results








Comment Period

Info

Submit Comments​​






​​​7/16/24 - 8/22/24






Comments Received

Draft 1

TPL-008-1​

Implementation Plan

 

Supporting Materials

Technical Rationale​

Unofficial Comment Form​

VRF/VSL Justifications​

Consideration of FERC Order 896 Directives


Initial Ballot

Ballot Open Reminder​

Info

Vote


4/24/24 - 5/3/24

​​

Ballot Results

 TPL-008-1

 Implementation Plan​

 Non-bindin​g Poll Results​
















​Consideration of Comments


Join Ballot Pools​

3/20/24 - 4/18/24

​Comment Period

Info​

Submit Comments​​


3/20/24 - 5/3/24​​


​Comments Received​

​Standards Committee accepted the waiver on December 13, 2023.

Standard Authorization Request

Supporting Materials

Unofficial Comment Form (Word)

Comment Period

Info​

Submit Comments



8/29/23 – 9/27/23





Drafting Team Nominations

Supporting Materials

Unofficial Nomination Form (Word)


Nomination Period

Info​​

Submit Nominations​​



8/29/23 – 9/27/23
 

 

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