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

​​​​​​​​​​​​​​​​​​​​Related Files​

Status
A 30-day formal comment period for the Project 2023-07 Transmission System Planning Performance Requirements for Extreme Weather – Phase II - Standard Authorization Request (SAR) is open through 8 p.m. Eastern, Monday, July 14, 2025

Additionally, a supplemental nomination period for additional drafting team members is open through 8 p.m. Eastern, Thursday, July 17, 2025.

Background

Phase I:
Extreme weather events have occurred with greater frequency in recent years and are projected to occur with even greater frequency in the future. On June 15, 2023, FERC directed NERC to develop a new or modified Reliability Standard to address a lack of long-term planning requirements for extreme heat and cold weather events (FERC Order No. 896). Phase I concluded when the DT developed a new TPL-008 and it was filed with FERC on December 17, 2024.

The new standard,TPL-008-1, requires: (1) the 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 analysis expanded to cover a range of extreme weather scenarios, including the expected availability of the resource mix during extreme heat and cold weather conditions and 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.

Phase II:
In parallel with the efforts related to FERC Order 896 and in addition to the priorities identified in NERC's work plan priorities informed by the Reliability Issues Steering Committee (RISC), Project 2023-07 Phase II will similarly harmonize the NERC TPL-001 transmission planning Reliability Standard with the creation of one or more new Reliability Standard(s) to address (1) normal and extreme natural events, (2) gas-electric interdependencies, and (3) DER. The potential risks for cascading outages that may be caused by these three areas of risk should use benchmark events and planning cases, have both the steady-state and stability analyses conducted, and have corrective action plans developed and implemented where BPS performance cannot be met.

Standards Affected:

Purpose/Industry Need
The purpose of this project is to address the transmission planning reliability gaps in TPL-001-5, that do not expressly require transmission planners and planning coordinators to address: (1) normal and extreme natural events, (2) gas-electric interdependencies, and (3) Distributed Energy Resources. The potential risks for cascading outages that may be caused by these three areas of risk should: (1) use benchmark events and planning cases, (2) have both the steady-state and stability analyses conducted, and (3) have corrective action plans developed and implemented where Bulk Power System performance cannot be met.

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DraftActionsDatesResultsConsideration of Comments
Supplemental Drafting Team Nominations
 
Supporting Materials
 



Supplemental Nomination Period​


In​fo​



06/18/25 - 07/17/25


Standard Authorization Request

Supporting Materials

Unofficial Comment Form (Word)


Comment Period

Info

Submit Comments




06/13/25 – 07/14/25
​​
Standard Authorization Request​​
 The Standards Committee approved SAR Phase II on November 15, 2023.​​​​​

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








TPL-008-1 was approved by the NERC Board and filed with FERC.





12/17/24



​​
Filed with FERC

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
 

 

​​