Key Takeaways
- MIT’s Plasma Science and Fusion Center (PSFC) demonstrated its high‑temperature superconducting (HTS) magnet technology, which enables stronger magnetic fields for compact fusion reactors and more efficient gyrotrons for microwave‑based applications.
- The same HTS‑driven gyrotron technology powers millimeter‑wave drilling, a promising method to access superhot geothermal resources (≥400 °C) by melting or vaporizing rock, offering faster penetration rates and lower cost escalation with depth compared with conventional drilling.
- Representative Jake Auchincloss (D‑Mass) toured PSFC, highlighted the potential for baseload clean power east of the Rockies, and noted emerging economic benefits for Massachusetts, including job creation and spin‑off activity.
- MIT spin‑out Quaise Energy, which successfully field‑tested gyrotron‑based drilling in Texas, is collaborating with PSFC to mature the technology and establish a dedicated laboratory facility for millimeter‑wave testing under realistic pressure‑temperature conditions.
- The initiative will integrate MIT’s expertise in geophysics, geochemistry, AI, and existing infrastructure, fostering an academic‑industry ecosystem aimed at de‑risking deployment, accelerating workforce development, and advancing next‑generation geothermal as firm power.
Overview of the Visit
On March 12, Representative Jake Auchincloss (D‑Mass) visited the MIT Plasma Science and Fusion Center (PSFC) to learn about the center’s cutting‑edge high‑temperature superconducting (HTS) magnet technology. The tour highlighted how PSFC’s research bridges fusion energy concepts and emerging geothermal applications. Auchincloss’s visit was part of a broader effort to understand how federal‑supported research can translate into scalable clean‑energy solutions for the United States, particularly in regions where conventional geothermal has been limited.
HTS Magnet Technology and Its Dual Impact
PSFC’s HTS magnets generate magnetic fields far exceeding those achievable with conventional low‑temperature superconductors, enabling more compact and cost‑effective fusion reactor designs. These high‑field electromagnets are essential for confining the hot plasma required in tokamaks and similar devices. Beyond fusion, the same HTS technology powers gyrotrons—high‑power microwave sources that operate more efficiently at elevated frequencies. Gyrotrons serve as the engine for millimeter‑wave systems that can deliver intense, focused energy to geological formations, opening a pathway to superhot geothermal extraction.
Millimeter‑Wave Drilling for Superhot Geothermal
Superhot geothermal targets rock temperatures near 400 °C, a regime where conventional mechanical drilling struggles due to tool wear, slow penetration rates, and rapidly rising costs with depth. Millimeter‑wave drilling uses focused microwave energy to heat, melt, or vaporize rock directly at the borehole bottom. Because drilling rates scale with input power while cost increases less steeply with depth than in mechanical drilling, this approach can overcome the economic barriers that have limited deep geothermal development. PSFC’s HTS‑enabled gyrotrons provide the necessary power and frequency to make the technique viable at utility scale.
Representative Auchincloss’s Perspective
During the tour, Auchincloss emphasized the transformative potential of millimeter‑wave geothermal for the eastern United States, where geology has historically been unsuitable for conventional geothermal projects. He noted that the technology could deliver clean, baseload power while reducing utility bills and spurring a new industry with high‑quality jobs in Massachusetts. Auchincloss also observed that the benefits are already materializing, as MIT‑originated spin‑outs and their suppliers are establishing operations in the state, laying groundwork for a regional clean‑energy cluster.
Quaise Energy’s Role and Field Demonstration
MIT spin‑out Quaise Energy, headquartered in Cambridge, participated in the visit and shared results from a successful fall‑2023 drilling demonstration in Texas. Using a gyrotron‑based millimeter‑wave system, Quaise achieved measurable penetration rates in hard rock, validating the core concept of microwave‑assisted drilling. The company’s early work was seeded by a 2008 MIT Energy Initiative (MITEI) grant that supported PSFC’s initial HTS‑gyrotron development. Quaise’s ongoing collaboration with PSFC aims to refine the technology, increase reliability, and prepare for field deployments at depths relevant to superhot geothermal reservoirs.
Planned Laboratory Facility for Millimeter‑Wave Testing
To advance the technology from laboratory proof‑of‑concept to real‑world readiness, PSFC is designing a new experimental facility dedicated to millimeter‑wave drilling under representative pressure and temperature conditions. The facility will subject rock samples to the high‑temperature, high‑pressure environment encountered several kilometers below the surface while delivering precise microwave power. This controlled setting will enable systematic testing of antenna designs, power coupling efficiency, and rock‑interaction phenomena, thereby de‑risking the path to field deployment.
Collaboration with the Earth Resources Laboratory
Oliver Jagoutz, Cecil and Ida Green Professor of Geology and director of the Earth Resources Laboratory (ERL), joined Auchincloss’s visit to underscore the interdisciplinary nature of the effort. ERL will partner with PSFC to provide realistic rock samples, geophysical characterization, and geochemical analysis for the planned millimeter‑wave tests. By combining PSFC’s engineering strengths with ERL’s expertise in subsurface science, the collaboration aims to ensure that the technology works across the diverse lithologies expected in superhot geothermal targets.
MITEI Spring Symposium and Panel Discussions
Earlier in March, MITEI hosted its Spring Symposium titled “Next‑generation geothermal for firm power.” The event examined the current state of the geothermal industry, highlighted innovative technologies such as millimeter‑wave drilling, and explored opportunities for scaling geothermal as a reliable baseload resource. Steve Wukitch, interim director of PSFC and a principal research scientist, moderated a panel on drilling advances, outlining the planned laboratory facility and its role in accelerating technology maturation. Matt Houde of Quaise Energy presented the company’s recent progress and outlined future milestones, including field pilots and pathway to commercialization.
GeoTech Summit and Ecosystem Building
The day after the symposium, MITEI and the Clean Air Task Force co‑hosted a GeoTech Summit entitled “Accelerating geothermal technology, projects, and deal flow.” The gathering brought together MITEI member companies, next‑generation geothermal firms, and investors to discuss financing, regulatory pathways, and partnership models. Discussions emphasized the need for an integrated academic‑industry ecosystem that can translate laboratory breakthroughs into investable projects, develop a skilled workforce, and create supply chains for high‑frequency microwave components and drilling accessories.
Outlook and Implications for Clean Energy
The developments showcased during Auchincloss’s visit point to a converging trajectory where advances in fusion‑related HTS magnet technology unlock new applications in energy extraction. Millimeter‑wave drilling, powered by HTS‑driven gyrotrons, offers a plausible route to tap the vast, untapped superhot geothermal resources that could provide continuous, carbon‑free electricity. If the planned PSFC laboratory succeeds in validating performance under realistic conditions, and if Quaise Energy can translate those results into field‑ready systems, the United States could gain a firm, Baseload clean‑energy complement to wind and solar—particularly in regions east of the Rockies where conventional geothermal has been limited. The ongoing collaboration between MIT, industry, and policymakers suggests that the necessary technical, economic, and workforce foundations are being laid to bring this vision to fruition.