Traditional Energy Sources Prevent Blackouts as Winter Storm Fern Cripples Renewable Power
Published · 5 min read
Wind and solar generation collapsed during extreme cold while coal, gas, and nuclear kept the lights on for millions of Americans
When Winter Storm Fern hit the United States in late January 2026, it revealed a critical gap in America’s energy grid. Solar power delivered just 11% of its potential capacity while wind managed only 23% during peak demand periods, forcing traditional power sources to prevent widespread blackouts.
The storm brought record cold temperatures and heavy snow across much of the country, creating the worst reliability test for the U.S. electricity grid since Winter Storm Uri in 2021.
Coal Generation Surges to Fill the Gap
As renewable energy sources struggled, coal generation jumped 31% in the week ending January 25 compared to the previous week. Natural gas and nuclear power also ramped up production as millions of Americans needed electricity to stay warm in sub-zero temperatures.
The U.S. Energy Information Administration confirmed coal’s crucial role in preventing widespread power failures during the crisis. These dispatchable energy sources—which can increase output on demand—proved essential when weather-dependent renewables could not deliver.
Renewables Face Weather Limits
In critical regions like the Midwest and Texas, wind generation operated at just 7-16% of potential output during the storm’s peak. Solar managed only about 25% of expected generation as thick clouds, snow, and ice blanketed affected areas.
Energy analysts using Solcast API data noted that “as the storm’s thick cloud shield moved across the continent, available solar irradiance dropped to only a small fraction of normal winter levels in affected regions.”
The problems were straightforward but unavoidable. Snow accumulation covered solar panels across wide areas. Wind turbines faced both extreme cold and periods of calm air, precisely when consistent power generation was most needed.
In some regions, hourly capacity factors for wind fleets plummeted from over 60% before the storm to just 7% at the height of the emergency.
Capacity Growth Doesn’t Guarantee Power
The renewable energy shortfalls occurred despite remarkable growth in wind and solar installations. Since Winter Storm Uri in 2021, utility-scale solar capacity across Texas, Louisiana, Mississippi, and Arkansas has grown from 353MW to 4,821MW—a 13-fold increase in just five years.
Renewables accounted for 93% of new generation capacity additions through September 2025. However, Winter Storm Fern showed that capacity additions alone don’t guarantee reliable power during extreme conditions.
The distinction proved critical: nameplate capacity represents maximum output under ideal conditions, but actual generation during emergencies can fall dramatically. Solar capacity factors typically bottom out around 12.3% in December, compared to peak performance of 33.2% in June, according to historical data.
Grid Operators Issue Emergency Orders
The Department of Energy issued Section 202(c) orders authorizing grid operators to direct backup generation resources at data centers and large industrial facilities to operate during the crisis, including the DOE emergency order for PJM aimed at keeping the grid reliable. The emergency measure was unprecedented in scale and demonstrated how seriously operators viewed the reliability threats.
In Northern Virginia, wholesale electricity prices spiked by 800% on January 25 as the storm intensified. The volatility highlighted growing tension between surging demand and reliability challenges of an increasingly weather-dependent grid.
Infrastructure Challenges Beyond Renewables
Winter Storm Fern also affected traditional energy infrastructure. The storm caused natural gas production freeze-offs that reached 17 billion cubic feet per day, approaching the record 18 bcf seen during Winter Storm Uri.
However, coal plants with on-site fuel stockpiles avoided the pipeline constraints that affected gas supply. This fuel security became particularly valuable as grid operators worked to maintain power during multi-day extreme cold.
Battery storage faced unexpected limitations as well. NERC analysts noted that solar output is “virtually zero during winter peak,” typically around 6 a.m. and 6 p.m., and that “4-hour batteries are unable to fully charge for the next day” during multi-day cold snaps.
Hundreds of Thousands Left Without Power
The human impact was severe. Winter Storm Fern left hundreds of thousands of Americans without power in some regions, with particularly difficult conditions in the Southeast where infrastructure was less prepared for extreme cold.
In communities less accustomed to severe winter weather, the combination of no power and sub-zero temperatures created dangerous living conditions.
The North American Electric Reliability Corporation has warned that “the continuing shift in the resource mix toward weather-dependent resources and less fuel diversity increases risks of supply shortfalls during winter months.”
What Comes Next
The storm’s lessons are already influencing energy policy discussions. Congress has renewed focus on transmission infrastructure improvements that could better share power between regions during emergencies. State regulators are reevaluating winterization requirements for all generation types.
While renewables provided 25.7% of U.S. electricity through the first 11 months of 2025, fossil fuels and nuclear dominated during peak winter demands. This pattern held true during Winter Storm Fern, when the energy mix shifted dramatically toward dispatchable resources.
Grid planning experts say the solution likely involves multiple strategies: continued renewable energy development paired with strategic investments in storage and transmission, maintaining sufficient dispatchable generation to handle extreme weather, and implementing demand-side management programs.
Most importantly, grid planning must incorporate realistic assessments of seasonal resource availability rather than relying solely on annual averages. With climate change expected to increase both the frequency and severity of extreme weather events, the reliability challenges revealed by Winter Storm Fern will only become more pressing.
As one industry analyst noted during the crisis, “avoiding total disaster shouldn’t be our benchmark for success.”
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