How will the increasing frequency of multi‑state winter storms test the resilience of the U.S. electrical grid, and what long‑term regulatory reforms are needed to mitigate cascading outages?
Multi-state winter storms have emerged as a defining challenge for U.S. electrical grid resilience, with five major cold weather events in the past thirteen years threatening bulk power system reliabilityFERC, NERC Release Final Report on Lessons from Winter Storm Elliott | Federal Energy Regulatory Commissionferc +1. The increasing interconnectedness of natural gas and electric systems, combined with evolving climate patterns, demands comprehensive regulatory reforms that address generation winterization, fuel supply reliability, interregional coordination, and market timing misalignments.
The relationship between climate change and extreme cold weather events remains an active area of scientific research, though evidence increasingly suggests that Arctic amplification—whereby the Arctic has warmed nearly four times faster than the rest of the planet since 1979—may contribute to disruptions in the polar vortex and jet stream that allow severe cold to penetrate further southClimate Change Reporting and Green Energy Misdirection: U.S. Media Coverage of the 2021 Texas Blackouts during Winter Storm Uri in: Weather, Climate, and Society Volume 17 Issue 2 (2025) ametsoc . While the overall frequency of snowstorms may decline in a warming world, the storms that do occur could be more intense due to increased atmospheric moisture capacity and changing extratropical cyclone patternsPower After the Stormucs .
The January 2025 arctic events demonstrated the grid's improved but still incomplete preparedness. Natural gas demand peaked at 150 Bcf/day while electric demand reached 683 GW, with unplanned generator outages peaking at 71,022 MW[PDF] January 2025 Arctic Eventsnerc . Critically, manual load shed was not required during these events, reflecting measurable improvements since Winter Storms Uri and Elliott[PDF] January 2025 Arctic Eventsnerc .
Winter Storm Elliott (December 2022) exposed systemic vulnerabilities across the Eastern Interconnection. A total of 1,702 individual generating units experienced 3,565 outages, derates, or failures to start, with unprecedented unplanned outages reaching 90,500 MW at peak—150 percent of Winter Storm Uri's outages[PDF] 2022 Winter Storm Elliott Inquiry Findings Gas-Electric Coordination ...energy +1. This resulted in 5,400 MW of firm load shedding—the largest controlled firm load shed in Eastern Interconnection history[PDF] 2022 Winter Storm Elliott Inquiry Findings Gas-Electric Coordination ...energy .
The breakdown of generation failures reveals three primary causes accounting for 96 percent of all outages[PDF] Inquiry into Bulk-Power System Operations During December 2022 ...nerc +1:
Cause Category | Percentage of Total | Peak MW Impact | |
|---|---|---|---|
| Mechanical/Electrical Issues | 41% | 31,000+ MW | |
| Freezing Issues | 31% | 110,962 MW | |
| Fuel Issues | 24% | 86,000+ MW |
By fuel type, the affected units comprised 47 percent natural gas-fired, 21 percent wind, 12 percent coal, 3 percent solar, 0.4 percent nuclear, and 17 percent other sources[PDF] Inquiry into Bulk-Power System Operations During December 2022 ...nerc . Notably, 75 percent of generating unit failures occurred at temperatures above the units' documented operating temperatures, indicating fundamental inadequacies in cold weather preparationFERC, NERC Release Final Report on Lessons from Winter Storm Elliott - NAESnaes .
Natural gas fuel supply issues accounted for 20 percent of all unplanned generating unit outages, derates, and failures to start during ElliottNERC sounds alarm over winter gas supplies, potential grid impacts | Utility Diveutilitydive . The Marcellus and Utica Shale formations—which produce more natural gas than any other U.S. region—experienced production drops of 23 to 54 percent during the event[PDF] Inquiry into Bulk-Power System Operations During December 2022 ...nerc +1.
The cascade of failures progressed through the gas supply chain[PDF] Inquiry into Bulk-Power System Operations During December 2022 ...nerc :
Winter Storm Uri demonstrated even more severe impacts, with Texas natural gas production dropping by approximately 70 percent[PDF] Inquiry into Bulk-Power System Operations During December 2022 ...nerc . Production declines have shown gradual improvement: approximately 25 percent during Uri, 18 percent during Elliott, 12 percent during Gerri and Heather, and less than 8 percent during January 2025 events[PDF] January 2025 Arctic Eventsnerc .
The initial cold weather reliability standards became enforceable on April 1, 2023, with Project 2021-07 Extreme Cold Weather Grid Operations, Preparedness, and Coordination Standards becoming effective October 1, 2024[PDF] ERO Enterprise CMEP Practice Guide - Cold Weather Preparedness ...nerc . EOP-012-2 established the foundational framework requiring Generator Owners to[PDF] EOP-012-2 – Extreme Cold Weather Preparedness and Operationsnerc :
Requirement R1: Calculate Extreme Cold Weather Temperature (ECWT) for each applicable unit at least every five calendar years, identifying cold weather operating limitations including capability, availability, fuel supply concerns, fuel switching capabilities, and environmental constraints.
Requirements R2 and R3: Implement freeze protection measures for Generator Cold Weather Critical Components:
Requirement R4: Maintain cold weather preparedness plans including documentation of freeze protection measures, wind protection, freezing precipitation mitigation, and annual inspection and maintenance protocols.
Requirements R6-R7: Develop Corrective Action Plans within 150 days (or by July 1, whichever is earlier) following Generator Cold Weather Reliability Events, with implementation timelines of 24 months for existing equipment modifications and 48 months for new equipment[PDF] EOP-012-2 – Extreme Cold Weather Preparedness and Operationsnerc .
FERC approved EOP-012-3 on September 18, 2025, incorporating several critical improvements directed by the CommissionNERC Targets Cold Weather Performance - TRC Companiestrccompanies +1:
Enhancement Area | EOP-012-2 | EOP-012-3 | |
|---|---|---|---|
| Constraint Definition | Referenced "cost" and "business practices" | Objective framework removing vague language | |
| Constraint Validation | Self-declaration | Mandatory CEA review and approval | |
| Constraint Review Period | Every 5 years | Every 36 months | |
| CAP Extensions | Entity discretion | NERC pre-approval required | |
| New Unit Requirements | CAP allowed post-operation | Must be complete before commercial operation |
The new Attachment 1 provides detailed criteria for acceptable constraint scenarios, including limitations for older wind turbines and manufacturer design thresholdsStrengthening Grid Resilience: FERC Approves EOP-012-3 for Extreme Cold Weather Preparedness - EFFECTIVE 10/1/2025gdsassociates +1.
The most significant regulatory gap affecting grid winter resilience is the absence of mandatory reliability standards for natural gas infrastructure. NERC's regulatory and enforcement authority focuses exclusively on the electric industryFERC Approves Cold Weather Reliability Standards | Jones Dayjonesday , while FERC has no jurisdiction over pipeline safety or securityNatural Gas Pipelines | Federal Energy Regulatory Commissionferc . As FERC Chairman Willie Phillips has stated: "Someone must have authority to establish and enforce gas reliability standards"FERC, NERC Release Final Report on Lessons from Winter Storm Elliott | Federal Energy Regulatory Commissionferc .
Natural gas infrastructure freeze protection mitigations remain voluntary for the natural gas industry in most of North America, resulting in uneven application of protections and continued supply risks during extreme conditions[PDF] 2025–2026 Winter Reliability Assessmentnerc . The FERC-NERC final report on Winter Storm Elliott explicitly states that "congressional and state legislation or regulation is needed to establish reliability rules for natural gas infrastructure to ensure cold weather reliability"FERC, NERC Release Final Report on Lessons from Winter Storm Elliott | Federal Energy Regulatory Commissionferc .
Texas stands alone in implementing comprehensive mandatory winterization requirements for natural gas facilities following Winter Storm Uri. The Railroad Commission of Texas adopted Weather Emergency Preparedness Standards (Statewide Rule 3.66) in August 2022, requiring083022-RRC Weatherization Standardstexas +1:
The Critical Infrastructure Division conducted more than 7,400 weatherization inspections during fiscal year 2025, with 100 percent of Tier One facilities (those producing more than 5 million cubic feet of gas daily, processing plants, underground storage, and pipelines directly serving power generation) inspectedTexas Railroad Commission Conducts Inspections to ...tccfui +1. Fines for violations can reach $1 million083022-RRC Weatherization Standardstexas +1.
Industry best practices for natural gas wellhead and production facility winterization include[PDF] RRC Report on Natural Gas Facility Weatherization Best Practicestexas +1:
Water Removal Technologies:
Physical Protection:
Operational Measures:
The isolated nature of ERCOT's grid during Winter Storm Uri demonstrated the life-safety implications of limited interregional transfer capability. While MISO and SPP experienced only "a handful of short duration" outages, ERCOT's capacity outages averaged 34,000 MW for two consecutive days, leaving more than 4.5 million people without power for up to four daysFACT SHEET: Benefits of Interregional Transmissioncleanenergygrid . ERCOT imported only 800 MW throughout the week, while MISO's imports peaked at 13,000 MWFACT SHEET: Benefits of Interregional Transmissioncleanenergygrid .
On November 19, 2024, NERC submitted its congressionally mandated Interregional Transfer Capability Study to FERC pursuant to Section 322 of the Fiscal Responsibility Act of 2023Interregional Transfer Capability Study: Strengthening Reliability ...federalregister +1. The study was required to include:
Notably, the study concluded that "a uniform minimum transfer capability requirement may not be an effective or efficient approach to ensure energy adequacy," instead recommending that policymakers address siting/permit approvals, cost allocation, and multi-party operating and maintenance agreements Federal Register :: Interregional Transfer Capability Study: Strengthening Reliability Through the Energy Transformation federalregister .
Industry groups have advocated for more aggressive approaches. The American Council on Renewable Energy has recommended FERC establish a minimum transfer capacity requirement, such as 15% of load, to ensure all regions can share power with neighborsACEG Interregional Planning Factsheetcleanenergygrid .
FERC's Order No. 1920 represents the most significant transmission planning reform since Order No. 1000, establishing requirements forExplainer on the Transmission Planning and Cost Allocation Final Rule | Federal Energy Regulatory Commissionferc +1:
Long-Term Regional Planning:
Enhanced Interregional Coordination:
Cost Allocation Reforms:
The gas industry operates on long-term contracts and steady demand patterns, while the electric sector depends on real-time market dispatch and hourly price signals[PDF] Gas-Electric Coordination reportnpc . Gas flows on a fixed daily schedule while electricity is dispatched on a rolling basis, creating structural mismatches that constrain generators' ability to adjust to real-time conditions[PDF] Gas-Electric Coordination reportnpc .
FERC's 2015 Order No. 809 implemented key scheduling coordination improvementsFERC Approves Final Rule to Improve Gas-Electric Coordination | Federal Energy Regulatory Commissionferc +1:
Element | Previous | Order No. 809 | |
|---|---|---|---|
| Timely Nomination Deadline | 11:30 a.m. CCT | 1:00 p.m. CCT | |
| Intraday Nomination Cycles | 2 | 3 | |
| Intraday 1 | N/A | 10:00 a.m. nomination, 2:00 p.m. flow | |
| Intraday 2 | N/A | 2:30 p.m. nomination, 6:00 p.m. flow | |
| Intraday 3 (no-bump) | N/A | 7:00 p.m. nomination, 10:00 p.m. flow |
The Commission declined to adopt the proposed change to move the gas day start from 9:00 a.m. CCT to 4:00 a.m. CCT, concluding that the record did not justify the changeFERC Approves Final Rule to Improve Gas-Electric Coordination | Federal Energy Regulatory Commissionferc . This misalignment continues to create challenges during winter emergencies when electric load increases simultaneously with generators exhausting daily nominated gas quantities FERC Proposes Reforms to Improve Gas-Electric Scheduling Coordination and Flexibility | Van Ness Feldman LLP vnf .
The National Petroleum Council has recommended that FERC require RTOs/ISOs to conduct comprehensive long-term planning that integrates resource adequacy and fuel assurance considerations[PDF] Gas-Electric Coordination reportnpc . Additional recommendations include ensuring adequate risk-based compensation for gas-fired generators to obtain sufficient fuel and operate reliably during stress periods[PDF] Gas-Electric Coordination reportnpc .
Battery storage deployments are expanding rapidly as a grid resilience tool. As of NERC's 2024 Winter Reliability Assessment, significant additions included[PDF] 2024–2025 Winter Reliability Assessmentnerc :
Battery systems provide critical frequency regulation capabilities, responding to grid deviations within milliseconds compared to minutes for traditional generatorsUnderstanding Frequency Regulation in Energy Systems: Key Role of Battery Energy Storage Systems (BESS) - TLS OFFSHORE CONTAINERS & TLS ENERGYtls-containers +1. However, the four-hour duration standard that dominates current markets may be insufficient for winter peaks, which tend to be longer than summer peaks From Minor Player to Major League: Moving Beyond 4-Hour Energy Storage | Grid Modernization | NLR nrel +1.
Long-duration energy storage technologies, such as iron flow batteries capable of storing up to 12 hours of energy, are emerging to address extended winter demand peaksWinter Grid Resiliency Needs Long-Duration Energy Storage | ESS, Inc.essinc . NREL projects that changing weather patterns, solar deployment, and electrification may lead to conditions where winter demand peaks become the primary driver of resource adequacy needsWinter Grid Resiliency Needs Long-Duration Energy Storage | ESS, Inc.essinc .
Winter demand response programs can provide substantial load reduction during critical periods. The American Council for an Energy-Efficient Economy found that winter demand response programs could have saved Texas utilities 23.5 GW during 2023, representing billions in avoided gas costsWinter Demand Response is For All Seasons - Virtual Peakervirtual-peaker . Key program characteristics includeWinter demand response: Managing peaks and enhancing efficiency - ICFicf :
PJM has expanded its demand response framework, with FERC approving revisions to provide 24-hour availability windows throughout the year effective with the 2027/2028 delivery yearDemand Response and Advanced Meteringferc .
New England has adopted dual-fuel capability as a mitigation measure for natural gas supply uncertainties[PDF] 2025–2026 Winter Reliability Assessmentnerc . Generators with backup fuel oil storage can switch fuels when gas supplies become constrained, though this approach requires substantial on-site storage infrastructure and ongoing fuel maintenanceA Case for Natural Gas Back-Up | Generac Industrial Energygenerac .
EOP-011-3 established requirements to minimize overlap between manual load shed circuits and those serving critical loads or used for underfrequency/undervoltage load sheddingMapping Document - Project 2021-07 Extreme Cold ...nerc . Transmission Operators must develop Operating Plans that includeMapping Document - Project 2021-07 Extreme Cold ...nerc :
FERC approved Reliability Standard EOP-011-4 in February 2024, requiring balancing authorities to identify critical natural gas infrastructure in load-shedding plans to ensure service is maintained to gas facilities during emergencies[PDF] Winter Energy Market and Electric Reliability Assessmentferc +1. This addresses a critical failure mode from Winter Storm Uri, where loss of power to natural gas facilities cascaded into further generation losses.
Congressional legislation is needed to establish mandatory reliability rules for natural gas infrastructure, as repeatedly recommended by FERC and NERCFERC, NERC Release Final Report on Lessons from Winter Storm Elliott | Federal Energy Regulatory Commissionferc +1. State and federal regulators should mandate activity-based winterization standards including equipment heating, backup fuel sources and supplies, and equipment temperature alarmsNational Grid, Con Edison urge FERC to adopt gas pipeline reliability requirements | Utility Diveutilitydive . FERC should consider launching a notice of inquiry to begin establishing reliability requirements for the interstate gas systemNational Grid, Con Edison urge FERC to adopt gas pipeline reliability requirements | Utility Diveutilitydive .
While NERC's study concluded that uniform minimum transfer requirements may not be optimal, the evidence from Winter Storm Uri demonstrates that insufficient interregional connectivity can have catastrophic consequencesFACT SHEET: Benefits of Interregional Transmissioncleanenergygrid . Regulators should:
Further reforms should address the persistent mismatch between gas and electric operating days. Specific measures include:
Market rules should evolve beyond the four-hour capacity standard to incentivize longer-duration storage deployments From Minor Player to Major League: Moving Beyond 4-Hour Energy Storage | Grid Modernization | NLR nrel +1. As winter peaks increasingly drive resource adequacy requirements due to electrification of heating, storage systems capable of 8-12 hours of discharge will become essential for maintaining reliability during extended cold weather events.
While EOP-012-3 improves upon its predecessors, the 24-48 month timelines for corrective action implementation may prove inadequate given the increasing frequency of severe winter events. Consideration should be given to:
The January 2025 arctic events demonstrated that improvements in generator availability, communication, and coordination are producing measurable resultsFERC, NERC Issue Report on System Performance During the January 2025 Arctic Weather | Federal Energy Regulatory Commissionferc . However, the structural vulnerabilities in natural gas supply, the limitations of regional grid isolation, and the timing mismatches between gas and electric markets represent persistent risks that can only be addressed through comprehensive, multi-sector regulatory reform.