The Real Reason Data Center Gas Power Plants Are So Dirty
Amazon's new gas power plant in Texas for its data center is permitted to emit substantial greenhouse gases due to its use of less efficient simple-cycle turbines. This trend, also adopted by Meta, Microsoft, Google, and xAI for their data centers across various US locations, allows for faster and cheaper installation but raises significant environmental concerns for the AI industry and the US power grid.
Amazon is developing a massive off-grid gas power plant in Texas to power one of its data centers, which is projected to be one of the largest greenhouse gas emitters in the US. The plant is permitted to emit up to 33 million tons of greenhouse gases annually, primarily due to its reliance on simple-cycle gas turbines, which are less efficient than combined-cycle units. These turbines release more waste heat and emissions for the same energy output. Despite spokesperson Heather Callahan's assurance that the site will include solar and battery storage and that Amazon is committed to net-zero by 2040, environmental concerns persist, with estimates suggesting the plant could out-pollute 78 average-sized natural gas plants.
This practice of using simple-cycle turbines is gaining traction among data center developers seeking quick and flexible power solutions, partly due to supply chain backlogs for more complex combined-cycle units. Examples include Williams' projects for Meta in Ohio, Crusoe Energy's plant for a Microsoft data center in Abilene, Texas, and another Crusoe project for Google's Goodnight data center in Texas. Additionally, xAI's Colossus 1 and 2 data centers in Memphis are also powered by numerous simple-cycle turbines, all permitted for millions of tons of emissions.
According to Britt Burt of Industrial Info Resources, simple-cycle turbines are not the most efficient but offer faster installation and quick start/stop capabilities, which are beneficial for the fluctuating energy demands of AI model training. Stephen Lynch from Penn State notes that having multiple smaller units allows for better load management. An added benefit is their typically lower water usage compared to combined-cycle plants, addressing a growing community concern.
While some companies, including Amazon and Williams, indicate future plans to connect these plants to the grid, the rapid, independent construction of these less efficient fossil fuel power plants threatens to establish a parallel, high-emission energy infrastructure designed to last decades. This raises questions about long-term environmental consequences and the potential for these assets to become stranded if energy needs shift.