The View From HETI

Texas gets one step closer to CCUS permitting authority

HETI has supported efforts to bring CCUS to a broader commercial scale since the initiative’s inception. Image via Getty Images

This month, the U.S. Environmental Protection Agency (EPA) announced its proposed approval of Texas request for permitting authority under the Safe Drinking Water Act (SDWA) for Class VI underground injection wells for carbon capture, utilization and storage (CCUS) in the state. The State of Texas already has permitting authority for Class I-V injection wells. Granting authority for Class VI wells recognizes that Texas is well positioned to protect its underground sources of drinking water while also advancing economic opportunity and energy security.

“In the Safe Drinking Water Act, Congress laid out a clear vision for delegating decision-making from EPA to states that have local expertise and understand their water resources, geology, communities, and opportunities for economic growth,” said EPA Administrator Lee Zeldin in a news release. “EPA is taking a key step to support cooperative federalism by proposing to approve Texas to permit Class VI wells in the state.”

The Greater Houston Partnership’s Houston Energy Transition Initiative (HETI) has supported efforts to bring CCUS to a broader commercial scale since the initiative’s inception. Earlier this year, HETI commissioned a “study of studies” by Texas A&M University’s Energy Institute and Mary K. O’Connor Process Safety Center on the operational history and academic literature of CCUS safety in the United States. The report revealed that with state and federal regulations as well as technical and engineering technologies available today, CCUS is safe and presents a very low risk of impacts to human life. This is useful research for stakeholders interested in learning more about CCUS.

“The U.S. EPA’s proposal to approve Texas’ application for Class VI well permitting authority is yet another example of Texas’ continued leadership in meeting the dual challenge of producing more energy with less emissions,” said Jane Stricker, Senior Vice President of Energy at the Greater Houston Partnership and Executive Director of the Houston Energy Transition Initiative. “We applaud the U.S. EPA and Texas Railroad Commission for their collaborative efforts to ensure the supply of safe, affordable and reliable energy, and we call on all stakeholders to voice their support for the application during the public comment period.”

The U.S. EPA has announced a public comment period that will include a virtual public hearing on July 24, 2025 from 5-8 pm and conclude on July 31, 2025.

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This article originally ran on the Greater Houston Partnership's Houston Energy Transition Initiative blog. HETI exists to support Houston's future as an energy leader. For more information about the Houston Energy Transition Initiative, EnergyCapitalHTX's presenting sponsor, visit htxenergytransition.org.

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A View From HETI

Simon M. King, a Rice University sophomore, served as the first author on a recent study of a new process for recycling lithium-ion batteries. Photo courtesy Rice

Rice University researchers have uncovered a more energy-efficient and faster way to recycle critical minerals from used lithium-ion batteries.

Traditional methods rely on high heat, long processing times and harsh chemicals to recover a small fraction of critical materials from batteries used in everything from smartphones to electric vehicles. However, the team from Rice's Department of Materials Science and Nanoengineering developed a process that uses a water-based solution containing amino chlorides to extract more metals in less time

The team published the findings in a recent edition of the scientific journal Small.

Simon King, a sophomore studying chemical and biomolecular engineering who completed this work as a summer research fellow at the Rice Advanced Materials Institute, served as first author of the study. He worked with corresponding authors Pulickel Ajayan, the Benjamin M. and Mary Greenwood Anderson Professor of Engineering, and Sohini Bhattacharyya, a research scientist in Ajayan’s lab.

By using a hydroxylammonium chloride (HACI) solution, the team achieved roughly 65 percent extraction of key battery metals in just one minute at room temperature, according to the study. The efficiencies grew to roughly 75 percent for several metals under longer processing times.

“We were surprised by just how fast the reaction occurs, especially without the involvement of high temperatures,” King said in a news release. “Within the first minute, we’re already seeing the majority of the metal extraction take place.”

By not requiring high temperatures or long reaction times, Rice predicts the process could have a major impact on cost and the environmental impact of lithium battery recycling. Additionally, the water-based HACI solution makes waste handling easier and lowers certain environmental risks.

In addition to extracting the materials, the team went on to demonstrate that the recovered metals could be recycled and reprocessed into new battery materials.

“A big advantage of this system is that it works under relatively mild conditions,” Ajayan added in the release. “That opens the door to more sustainable and scalable recycling technologies.”

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