From Oil Wells to Power Grids: Mantle's $5M Bet on a Hybrid Future

DALLAS, TX – June 16, 2026 – In a move that blurs the lines between fossil fuels and renewables, Hunt Energy subsidiary Mantle Energy has spun out of its corporate incubator, armed with a $5 million seed round to pursue a radical new vision. The funding, led by 17Shoals Inc., is a significant vote of confidence in a technology that promises to do what was once unthinkable: transform aging oil and gas fields into a source of low-carbon, baseload geothermal power.

Mantle isn't just another clean-tech startup. It’s a product of one of Texas's most storied energy dynasties, incubated within Hunt Innovative Technologies and now sent into the world to prove its mettle. The company aims to repurpose the vast, underutilized infrastructure of the oil patch, unlocking what it claims could be 90% of the energy potential left behind in reservoirs. This isn't about choosing between oil and renewables; it's about forcing them into a productive, and potentially profitable, marriage.

A Disruptive Approach to Buried Treasure

At the heart of Mantle's strategy is a process it calls "activated geothermal." Unlike conventional geothermal energy, which requires tapping into naturally occurring pockets of subterranean heat often found in volcanic regions, Mantle intends to create its own. The company plans to use proprietary techniques to generate controlled thermal combustion deep within existing oil and gas formations. This man-made heat serves a dual purpose.

First, it facilitates Enhanced Oil Recovery (EOR). By heating the reservoir, the viscosity of residual, hard-to-reach oil is reduced, allowing for its extraction. This has long been a goal of the industry, but traditional methods, such as injecting steam generated by burning natural gas, are notoriously energy-intensive and carbon-heavy. Mantle’s approach seeks to turn this process on its head.

Second, and more transformatively, the immense heat generated underground will be captured to produce geothermal electricity. By circulating water through the heated formation and using the resulting steam to drive turbines, Mantle can generate a constant, reliable stream of baseload power—the holy grail of an energy grid increasingly reliant on intermittent sources like wind and solar. It’s a bold attempt to create geothermal power plants where nature didn’t place them, leveraging the millions of oil and gas wells that dot the American landscape.

"There are plenty of oil and gas resources available, but often they are not economically feasible to extract under current methods," said James Franks, the newly appointed CEO of Mantle Energy, who previously spearheaded innovation at Hunt. "Mantle leverages these remaining resources uniquely by converting them to thermal energy to add baseload power to the grid, while keeping most of the carbon in the ground."

This final point is critical to Mantle's environmental and economic pitch. The company asserts its process includes sub-surface storage protocols that lock carbon emissions underground, potentially turning EOR from a carbon source into a form of sequestration. If successful, it could redefine the value proposition of stranded assets, turning environmental liabilities into power-generating assets.

The Corporate Catalyst: Hunt Energy's Innovation Playbook

The emergence of Mantle is as much a story about corporate strategy as it is about technology. The venture was born within Hunt Innovative Technologies, the incubation arm of Hunt Energy tasked with developing disruptive solutions. This spin-out represents a validation of Hunt's model: nurturing nascent ideas internally before seeking external capital to scale them as independent entities.

"It is wonderful to see another one of our incubated disruptive technologies leave the nest with this outside investment to become a standalone startup," commented Todd Benson, Chief Innovation Officer for Hunt Energy. Benson highlighted the technology's potential to address America's energy needs while being both "environmentally conscious but also commercially viable."

This strategy allows the parent company to take calculated risks on moonshot ideas without diverting focus from its core operations. It also cultivates leaders like James Franks, who transitioned from an Entrepreneur-in-Residence at the incubator to the CEO of the new venture. Franks' deep background in upstream oil and gas, combined with his experience in scaling innovation, makes him a uniquely suited leader for Mantle's ambitious mission.

Hunter Hunt, CEO of Hunt Energy, framed the venture in the context of a broader energy transition. "By repurposing existing oil and gas resources into a low carbon energy source to generate electricity, Mantle will unlock a new source of reliable and sustainable power to meet the growing demands of our electric grid," he stated. This perspective underscores a pragmatic shift within legacy energy firms, which are increasingly viewing innovation not just as a tool for efficiency, but as a mechanism for reinvention.

The 'Why Behind the Buy': Investing in Transitional Energy

The $5 million seed round, led by 17Shoals Inc., is more than just startup capital; it's a market signal. Investors are placing a bet on the viability of "transitional energy"—technologies that don't fit neatly into the buckets of fossil fuels or renewables, but instead bridge the two. With an estimated 500,000 idle wells in the U.S. alone suitable for some form of geothermal repurposing, the market opportunity is immense.

Tracey Maynor of 17Shoals expressed her enthusiasm for this new paradigm. "This technology leverages oil and gas resources in a new, unique, and greener way. Mantle will reshape oil production and create Geothermal energy in a manner that has never been demonstrated," she said. The investment thesis appears to be built on the dual revenue streams—EOR and power generation—and the massive capital efficiency gained by retrofitting existing infrastructure rather than building from scratch.

Mantle enters a nascent but growing competitive landscape. Startups like Gradient Geothermal and Favo Energy are also exploring ways to repurpose wells, but Mantle's active heat generation method could be a key differentiator, potentially expanding its geographic and geological applicability. The company's challenge will be to prove its technology is not only technically feasible but also economically superior to both traditional energy extraction and other emerging geothermal solutions.

Navigating the Path from Pilot to Power Grid

With fresh capital in hand, Mantle's immediate focus is clear: execution. The funds are earmarked for scaling pilot deployments, formalizing a pilot plan, and building out the team. These initial projects will be the ultimate test of the company's technology and its ambitious claims. The success of these pilots will be the critical data point for a planned Series A fundraising round, which will be necessary to take the concept from a handful of wells to a grid-scale solution.

The journey from pilot to a commercial power source is fraught with technical, regulatory, and economic hurdles. Mantle will need to prove the efficiency of its underground combustion, the reliability of its power output, and the integrity of its carbon storage. Securing partnerships with asset owners and power purchasers will be just as crucial as perfecting the engineering.

Yet, in a world grappling with the dual challenges of energy security and climate change, hybrid solutions like Mantle's are attracting serious attention. By refusing to see oil fields as a relic of the past and instead viewing them as a foundation for the future, Mantle Energy is making a powerful case that the next great energy revolution may not come from a pristine lab, but from the repurposed heart of the industrial world.