The recent Winter Storm Fern, which left millions without power, has sparked a heated debate about the reliability of renewable energy sources. But here's the truth: it wasn't wind or solar that failed during this extreme weather event. Let's dive into the facts and uncover the real issues behind these large-scale outages.
The Culprit: Distribution, Not Generation
When millions lose power, it's usually the distribution network that takes the hit first. Distribution systems, with their poles, transformers, and local lines, are highly vulnerable to the forces of nature. In Storm Fern's case, freezing rain caused distribution lines and nearby vegetation to become coated in ice, leading to snapped cables and fallen trees. This damage to the distribution network is often the primary cause of neighborhood-wide outages.
Transmission systems, on the other hand, are more resilient and interconnected. They are designed to withstand extreme conditions, making them less likely to fail. However, if a transmission system does go down, the impact can be significant.
Hardening the Grid: A Costly Undertaking
Hardening the distribution infrastructure is crucial for improving reliability, but it comes at a hefty price. Burying power lines underground can prevent storm damage, but it costs approximately $1 million to $1.5 million per mile, compared to around $300,000 per mile for overhead lines. As extreme weather events become more frequent and intense, the cost of grid hardening will only continue to rise.
Wind and Solar: Not the Culprits
Contrary to some biased narratives, wind and solar generation are rarely the initiating causes of large-scale outages during storms. During winter events like Fern, wind output is often strong, and solar generation follows the availability of daylight. The real issue lies in getting the generated electricity through damaged local wires to customers, not a lack of generation.
System Reliability: Focus on Distribution
From a cost perspective, investing in hardening distribution infrastructure and improving restoration speed delivers far more reliability than debating the generation mix. It's about ensuring the electricity reaches customers efficiently and reliably.
Outage Data: Solar and Wind's Role
Based on available data, there is no evidence that wind or solar generation was a primary cause of outages during Storm Fern. The majority of customer outages were due to weather-related damage to the distribution system. When generation does face challenges, it's often thermal plants that struggle with frozen fuel lines, iced-over cooling water intakes, and frozen coal piles.
Modern wind turbines, equipped with cold-weather packages, perform well in cold conditions. Wind output during winter storms often meets or exceeds seasonal averages. Solar performance during Fern was also predictable and well-managed by system operators.
Fuel Supply and Winterization: Critical Factors
The inadequate cold-weather preparedness of thermal generators and their fuel supply infrastructure was a core cause of generation outages during previous storms like Winter Storm Uri. Natural gas production facilities can struggle to operate during extreme cold, affecting gas-fired power plants and increasing costs for consumers. During Fern, natural gas prices hit record highs due to surging demand and a 10% drop in supply caused by cold-related shut-ins.
Political Framing vs. Operational Data
The evidence from Storm Fern paints a more nuanced picture than simple narratives about coal saving the grid or renewables causing failures. The primary driver of customer outages was damage to the distribution system, and stress on the generation side was concentrated in the thermal fleet, particularly natural gas units facing fuel delivery constraints and mechanical failures.
Coal generation increased during the storm due to its fuel storage capabilities, avoiding pipeline freeze-offs that constrained gas supply. Wind and solar output remained close to forecast expectations. The argument about "energy subtraction" typically refers to thermal plant retirements and the claim that these retirements reduced reserve margins. However, the operational evidence from Fern suggests that retirements were not the decisive factor in reliability.
The Value of Resource Diversity
Data from Storm Fern supports the value of a diverse resource mix. In ERCOT, wind and solar supplied up to 30% of generation during key storm periods, and post-2021 winterization efforts kept turbines online even as gas production dropped. Fern was also the first major winter storm with over 20 GW of battery storage deployed nationally. Batteries provided critical frequency response, acting as shock absorbers for the grid when large thermal plants tripped offline.
Coal's fuel storage proved valuable, but it's an argument for fuel diversity, not technology dominance. The grid held together through a combination of fuel-secure generation, emergency diesel dispatch, battery flexibility, and operator intervention. The key takeaways for planners are the importance of fuel reliability, winterization standards, and maintaining a diverse resource portfolio.
Disinformation and Countering Misinformation
Coordinated disinformation campaigns about renewables often exploit moments of uncertainty after grid emergencies. In the case of Storm Fern, a wave of social media videos, partisan commentary, and official statements claimed that wind and solar weakened the grid, despite grid operator reports and market data pointing to other factors. These inaccurate narratives can drive policy and investment decisions that ultimately make the grid less resilient and more expensive.
To counter these claims, speed and specificity are key. Using real data and trusted messengers, such as independent analysts and creators, to explain the actual constraints on the system in plain language is essential. Disinformation thrives in the first 24 to 48 hours after a major event, so timely, factual analysis grounded in operator reports is crucial.
As we navigate the complexities of our energy infrastructure, it's important to separate political framing from operational data and focus on the facts. By understanding the real issues behind large-scale outages, we can make informed decisions to improve the reliability and resilience of our grid.
