Related Files
Status
The comment period for the Project 2023-07 Transmission System Planning Performance Requirements for Extreme Weather – Phase II - Standard Authorization Request (SAR) concluded 8 p.m. Eastern, Wednesday, July 23, 2025. The comments received can be accessed via the link below. The drafting team will review all responses received during the comment period and determine the next steps of the project.
The supplemental nomination period for additional drafting team members has been extended and is now open through 8 p.m. Eastern, Monday, August 18, 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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