money moves

Houston energy tech PE group raises $3B third fund

Ara Partners has announced the closing of its third fund. Photo via Getty Images

A Houston-based private equity firm that focuses on industrial decarbonization investments has closed its latest fund.

Ara Partners has secured over $3 billion of new capital commitments for its Ara Fund III, closing $2.8 billion of limited partner commitments, which represents an oversubscription of its $2 billion initial target.

"We are grateful for the extraordinary interest in Fund III demonstrated by Ara's increasingly global, blue-chip investor base," Charles Cherington, managing partner of Ara, says in a news release. "The strong support from new and existing investors, is a testament to their confidence in our talented team, our investment strategy, and the compelling opportunities in the industrial decarbonization sector."

The third fund's institutional investors includes pension funds, insurance companies, sovereign wealth funds, endowments, and foundations from around the world. Ara Fund III will continue the firm's mission of investing in and buying out decarbonization-aligned industrial companies, specifically targeting ones headquartered in the United States, Canada, and Europe.

"The growing, global presence of Ara's platform and portfolio directly reflects the industrial economy's continued demand for the technological innovation and infrastructure needed to decarbonize," Troy Thacker, managing partner of Ara, says in the release. "The support we have received for Fund III will enable the Ara team to continue investing in high-growth companies globally that are positioned to build value while achieving positive environmental impacts."

The newly closed fund has already made four investments:

  • Vacuumschmelze, a global producer of advanced magnetic materials and rare earth permanent magnets
  • Genera, a sustainable pulp and packaging producer
  • CFP Energy, a provider of market-facing solutions in environmental and green energy products to industrial customers across Europe
  • CycleØ, a fully integrated developer of distributed biomethane facilities

Founded by Cherington and Thacker in 2017, Ara has around $5.6 billion in assets under management. It's previous fund closed in September 2021 at an oversubscribed $1.1 billion.

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A View From HETI

Sage Geosystems has selected a site for its next major geothermal facility. Photo via sagegeosystems.com

Sage Geosystems, a Houston-based developer of geothermal power systems, has chosen a site in Nevada for its commercial-scale Project Vector facility.

The company’s two-well enhanced geothermal system (EGS) will deliver around-the-clock geothermal heat to Ormat Technologies’ Blue Mountain geothermal power plant in Winnemucca, Nevada.

The startup expects to begin drilling the first well later this year, with the first electricity to be generated in 2027 and full-scale production to start in 2028.

In the Nevada system, fluid will circulate through an engineered subsurface reservoir, absorb heat from the surrounding rock and return heat to the surface. The heat will be delivered to the Blue Mountain plant for conversion into electricity.

Project Vector builds on the performance of Sage’s SMECI facility in South Texas. That facility’s results, combined with Sage’s digital twin platform, will be used to shape to the design and development of Project Vector.

Project Vector supports Sage’s growing commercial pipeline, including a 150-megawatt geothermal power agreement with Meta Platforms, the parent company of Facebook and Instagram.

“Blue Mountain is an ideal location for Sage to take the next step in continuing to commercialize our proprietary EGS approach,” Jason Peart, chief operating officer at Sage, said in a release. “By delivering geothermal heat into an existing power plant, Project Vector can demonstrate the model for bringing firm, 24/7 geothermal power to market at scale.”

Project Vector extends Sage’s relationship with Ormat.

In August 2025, Sage and Ormat agreed to accelerate commercialization of Sage’s geothermal technology at an Ormat power plant. This January, Ormat co-led Sage’s $97 million Series B funding round.

Sage, founded in 2020, has raised about $159 million across three funding rounds.

As the startup ramps up its ESG platform, Sage is targeting data centers as customers, among other large-scale users of electricity.

“The energy needs are huge, and they need it now,” CEO Cindy Taff said on Data Center Frontiers’ podcast. “They can’t depend on the grid anymore.”

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