energy transition materials

DOE grants Houston-area energy tech co. over $5M for rare earth elements study

A company headquartered in The Woodlands has secured funding to study the recovery of rare earth elements as they pertain to the energy transition. Photo via tetratec.com

The Woodlands-based Tetra Technologies, an energy technology and services company, has picked up nearly $5.4 million in U.S. Department of Energy funding to study the recovery of rare earth elements and other critical minerals from coal byproducts in Pennsylvania.

The funding also will enable Tetra to explore converting coal byproducts, known as underclay, into clays that could be sold. In addition to the DOE funding, the company also secured about $1.3 million for a total of $6.7 million.

Publicly traded Tetra got the funding as part of a more than $17 million package aimed at designing and building facilities to produce rare earth elements, along with other critical minerals and materials, from coal resources. The Department of Energy (DOE) says these minerals and materials will go toward generating clean energy.

Rare earth elements can be derived from the country’s more than 250 billion tons of coal reserves, over 4 billion tons of waste coal, and about 2 billion tons of coal ash, according to DOE.

Clean energy fixtures like solar plants, wind farms, and electric vehicles generally require more minerals to build than their fossil-fuel-based counterparts, according to the International Energy Agency. For example, a typical electric car requires six times the mineral resources of a conventional car and an onshore wind plant requires nine times more mineral resources than a gas-fired plant.

The American Geosciences Institute says rare earth elements, a set of 17 metallic elements, also are an essential component of many tech-dependent products. These include cell phones, flat-screen TVs, and radar and sonar systems.

China is the top country for production of rare earth elements, with the U.S. far behind at No. 2.

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A View From HETI

Quaise Energy is developing Project Obsidian, a superhot geothermal plant in central Oregon. Rendering via quaise.com.

Houston-based Quaise Energy is looking to raise $200 million to support the development of a 50-megawatt superhot geothermal plant in Oregon.

The company is seeking $100 million in Series B funding, plus an additional $100 million from grants, debt and project-level finance, a representative from the company tells Energy Capital. Axios first reported the news late last month.

Quaise specializes in terawatt-scale geothermal power. It is known for its millimeter-wave drilling technology, which was developed at MIT.

The company's Project Obsidian development in central Oregon will combine conventional drilling with its millimeter-wave technology. Quaise says the project, targeted to come online in 2030, could be the first commercial plant to operate in superhot rock, a more efficient and abundant resource, but one that requires more advanced and durable drilling technology.

Quaise says Obsidian would initially generate 50 megawatts of "always-on" power and would be designed to add 200 megawatts as additional wells are developed. A power-purchase deal has already been signed for the initial 50 megawatts with an undisclosed customer.

A representative from the company says Quaise would also use the funding to continue advancing its millimeter-wave technology and prepare it for commercialization.

Last year, the company drilled to a depth of about 330 feet using its millimeter-wave technology at its field site in Central Texas.

“Our progress this year has exceeded all expectations,” Carlos Araque, CEO and president of Quaise Energy, said at the time. “We’re drilling faster and deeper at this point than anyone believed possible, proving that millimeter-wave technology is the only tool capable of reaching the superhot rock needed for next-generation geothermal power. We are opening up a path to a new energy frontier.”

Canary Media reports that Quaise plans to drill to nearly 3,300 feet later this year and to deploy its millimeter-wave technology at its power plant in 2027.

Quaise raised $21 million in a Series A1 financing round in 2024 and a $52 million Series A in 2022. Major investors include Prelude Ventures, Safar Partners, Mitsubishi Corporation, Nabors Industries, TechEnergy and others.

Quaise was one of eight Houston-area companies to appear on Time magazine and Statista’s list of America’s Top GreenTech Companies of 2025.

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