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

​​​​​​​​​​​​​​​​​​​​Related Files​

Status

Board Adopted: December 10, 2024​

Filed with FERC: December 17, 2024

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.

Subscribe to this project's observer mailing list 
Select "NERC Email Distribution Lists" from the "Service" drop-down menu and specify “Project 2023-07 Transmission System Planning Performance Requirements for Extreme Weather Observer List" in the Description Box.​



DraftActionsDatesResultsConsideration of Comments

Final Ballots

TPL-008-1​

Clean | Redline to Last Posted

Implementation Plan​​

 

Supporting Materials

Technical Rationale​

VRF/VSL Justifications​

Consideration of FERC Or​der 896 Directives​

Informational Materials

TPL-008-1 ERO Benchmark Weather ​E​vent Development and Mai​ntenance Process ​​*updated

Benchmark Event Data​

TPL-008​ Data Library Read Me

Extreme Temperature Assessment (New Definition)

RSAW​









Final Ballots

Info

Vote​








​12/02/24 - 12/06/24
​​





Ballot Results




Draft 4

TPL-008-1​

Clean | Redline to Last Posted

Implementation Plan​​

 

Supporting Materials

Technical Rationale​

Unofficial Comment Form​

VRF/VSL Justifications

Consideration of FERC Or​der 896 Directives​

Informational Materials

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

Benchmark Event Data​

TPL-008 Data Library Read Me




Additional Ballot

Ballot Open Reminder​

I​nfo

Vote
​​​





11/12/24 - 11/21/24



Ballot Results




















​​
Consideration of Comments

Comment Period


In​​fo

Submit Comments​​



11/07/24 - 11/21/24



Comments Received​

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​






Additional Ballot

Ballot Open Reminder​

Info

Vote​​







10/11/24 - 10/21/24






Ballot Results






















Consideration of Comments

Comment Period


In​fo

Submit Comments​​



10/07/24 - 10/21/24​



Comments Received

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

























Consideration of Comments




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​

The ​Standards Committee accepted the waiver on December 13, 2023.
SAR
The Standards Committee accepted the SAR on July 19, 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
 

 

​​