The Case Against Carbon Capture: Prioritizing Renewables for AI Energy Demands
The rapid growth of AI datacenters has created an urgent need for reliable, scalable, and sustainable energy sources. As electricity demand surges, driven by AI's computational requirements, the debate over how to meet this demand while addressing climate goals has intensified. Carbon capture technologies, such as carbon capture and storage (CCS) and carbon capture, utilization, and storage (CCUS), are often touted as a solution to CO2 emissions from fossil fuel plants. However, evidence suggests that carbon capture is an inefficient and costly approach compared to investing in renewable energy sources like solar, wind, and energy storage, which avoids CO2 generation. This analysis argues that prioritizing renewables over carbon capture is critical for meeting AI datacenter energy needs, reducing CO2 emissions, and maintaining global leadership in AI innovation.
AI Datacenter Energy Demands
AI datacenters are a significant driver of global electricity consumption. According to the International Energy Agency (IEA), datacenters consumed 415 terawatt-hours (TWh) in 2024, representing 1.5% of global electricity use. By 2030, this demand is projected to more than double to 945 TWh, equivalent to the annual electricity consumption of a country like Japan. In the United States, datacenters are expected to account for nearly half of the growth in electricity demand over the next five years. AI-optimized datacenters, with their high computational requirements, are the primary contributors to this surge. Meeting this demand requires energy sources that can be deployed quickly, scaled efficiently, and aligned with global climate goals to reduce greenhouse gas emissions.
Limitations of Carbon Capture
Carbon capture technologies aim to (as the name says) capture CO2 emissions from fossil fuel plants or industrial processes, either storing it underground or repurposing it for other uses. However, research highlights significant drawbacks that undermine their effectiveness and economic viability.
A 2019 Stanford University study found that carbon capture systems capture only 10 to 11% of total CO2 equivalent emissions over a 20-year period when accounting for upstream emissions from energy production and equipment manufacturing. The efficiency of these systems is often overstated, with real-world performance, such as a coal plant achieving 55.4% efficiency over six months, falling far below the projected 85 to 90%. Moreover, due to the energy demand of carbon capture system operations, the net effect can be increased air pollution; this is called the energy penalty. The air pollution includes particulate matter and nitrogen oxides, leading to higher social costs, including health impacts, economic losses, and climate damages. In these situations, it would be better to operate fossil fuel plants without capture than with it. However, the even better solution would be transitioning to renewables with energy storage.
CCS cost is another critical barrier. The Stanford study, as reported by Environment America in February 2025, concluded that investing in carbon capture is 9 to 12 times more expensive than switching to 100% renewable energy when considering energy costs, health impacts, and emissions. The IEA notes that while CCUS may be cost-competitive in hard-to-abate sectors like cement and steel production, it is not a scalable solution for widespread emissions reduction compared to renewables. Diverting funds to carbon capture reduces resources available for more effective solutions, such as solar, wind, and energy storage, which offer greater emissions reductions and faster deployment.
The Case for Solar and Wind with Energy Storage
Solar and wind power are the fastest-growing and most cost-effective energy sources available, making them ideal for meeting AI datacenter energy demands. According to Carbon Brief, solar and wind are the fastest-growing electricity sources in history, with solar power generation increasing more than eightfold and wind power more than doubling in the US over the past decade, as reported by Climate Central in April 2024. In 2023, solar added more new capacity globally than coal, increasing its share of global electricity from 4.6% to 5.5%, while wind held steady at 7.8%.
The cost of renewables has plummeted, with solar and wind costs dropping by 85% and 55%, respectively, between 2010 and 2020, according to Ember. These energy sources can be deployed more quickly than fossil fuel or nuclear plants, which require longer lead times and higher upfront investments. To address the intermittency of solar and wind, industrial-level energy storage systems, such as lithium-ion batteries, pumped hydro, and compressed air storage, provide reliable power delivery. The IEA emphasizes that grid-scale battery storage is critical for integrating renewables into the grid to meet future energy needs and net-zero emissions goals by 2050.
Impact on CO2 Emissions and Fossil Fuel Dependence
Investing in carbon capture risks extending the operational life of fossil fuel plants, which undermines efforts to reduce CO2 emissions. A September 2023 Earthjustice report highlighted concerns that carbon capture is used by the fossil fuel industry to justify the continued operation of polluting facilities, perpetuating reliance on coal and gas. A February 2024 article noted community opposition in Louisiana, where carbon capture projects were seen as prolonging the life of dirty power plants. By contrast, prioritizing renewables allows for the phased retirement of fossil fuel plants, directly reducing CO2 emissions and aligning with climate goals.
The International Institute for Sustainable Development (IISD) reported in November 2023 that some CCS projects produce more emissions than they sequester, particularly when powered by fossil fuels. Redirecting investments to renewables avoids this inefficiency, as solar and wind generate electricity with near-zero emissions during operation. By scaling renewables and storage, countries can meet AI energy demands while accelerating the transition away from fossil fuels, reducing overall greenhouse gas emissions.
Implications for AI Leadership
The ability to meet AI datacenter energy demands is critical for maintaining global leadership in AI innovation. Delays in deploying sufficient clean energy could hinder AI development, as datacenters require consistent and affordable electricity. Solar and wind, supported by energy storage, offer the fastest path to scaling energy capacity, ensuring that AI infrastructure can expand without reliance on fossil fuels. Diverting funds to carbon capture, which is less effective and more costly, risks slowing this progress, potentially ceding technological advantages to countries that prioritize the fast growth that renewables offer.
Conclusion
The evidence suggests that carbon capture is an inefficient and costly approach compared to investing in solar, wind power, and energy storage to meet the growing energy demands of AI datacenters. Carbon capture's low efficiency, high costs, and potential to extend fossil fuel plant lifespans make it a less viable solution for reducing CO2 emissions. In contrast, renewables offer a scalable, cost-effective, and environmentally sustainable path to powering AI infrastructure while supporting climate goals. By prioritizing solar, wind, and energy storage, countries can meet AI energy needs, reduce emissions, and maintain leadership in the global AI race. As of 2025, redirecting resources from carbon capture to renewables is the most strategic approach to achieving these objectives.



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