Here are the most promising energy tech startups in the market today. Natalie Harms/InnovationMap

This week, 39 energy startup companies from all over the world pitched in Houston — and nine were recognized as being the most promising of the batch.

The Rice Alliance for Technology and Entrepreneurship returned its Offshore Technology Conference pitch event to its in-person capacity and host the annual event at the Ion Houston for the first time. The event featured three-minute pitches from the companies, and a select group of corporate and venture investors decided on the top nine to honor.

"We asked investors and corporates to look at the companies here today and help us determine the companies most promising — based on those that have an innovative technology that is solving a large problem, has customers willing to pay for it, and has the right team to build and grow their company," Brad Burke, managing director of the Rice Alliance says to the crowd at the event on May 3.

Here's which energy tech companies stood out to investors.

EarthEn

EarthEn, a Chandler, Arizona-based company, is a grid-scale energy storage solution. The technology can provide short-term — 6 to 8 hours — and long-term — over 100 hours — storage. The EarthEn pods provide a cheaper alternative and are built using 3D printing.

Echogen Power Systems

Based in Akron, Ohio, Echogen Power Systems has created a technology that captures heat that would otherwise be lost and converts it to a useable power source. The solution allows for any customer that operates at significant levels of heat to have a cost-effective energy option.

FuelX Innovation

Based in Aiken, South Carolina, FuelX Innovation is manufacturing solid-state hydrogen products and power systems, impacting mobile hydrogen fuel cell-powered applications. The company is focused on producing the lowest cost Alane, or aluminum hydride, for the fuel cell.

Lillianah Technologies

Lillianah Technologies, based in the Houston area in Spring, uses algae to remove carbon dioxide from the atmosphere. The company sells carbon offsets to corporations.

oPRO.ai

oPRO.ai — which is based in Los Altos, California — is providing its customers with deep learning optimization software for process and responsible operations for oil and gas, petrochemical, chemicals, and metal industries.

Proteum Energy

Phoenix, Arizona-based Proteum Energy provides its customers low-cost, clean hydrogen by reforming renewable ethanol into renewable hydrogen.

Sync Power Solutions

Embracing a clean sheet approach, Sync Power Solutions, based in Abilene, Texas, created a solution involving a redesign of electric motors and generators to increase energy efficiency, save on costs, and more.

Utility Global

Houston-based Utility Global is using high temperature electrolysis without the use of electricity to produce hydrogen from waste gases.

ZL Innovations

Based in Portland, Oregon, ZL Innovations is focused on eliminating greenhouse gas emissions from failed industrial valves. The company's solution is a magnetic actuation assembly that can be better sealed to prevent emissions.

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Houston space co. adds local colleges to university alliance

space schools

Houston’s Axiom Space has added 26 new members to its University Alliance—including two from Houston—to support the next generation of space exploration.

Engineers, researchers and students from the partnering universities will be dedicated to advancing microgravity research, technology development and commercial innovation in low-Earth orbit.

Rice University and the University of Houston are among the new colleges to join the alliance, which launched with 15 members last year. The University of Texas at Austin and the University of Texas at El Paso have also joined, in addition to international institutions in Europe, Asia and Australia, and others from around the U.S. See full list here.

“Through the University Alliance, Axiom Space is uniting the international research community driven to enable human progress,” Lucie Low, Axiom Space chief science officer, said in a news release. “Together, alliance members are taking the initiative to ensure microgravity research benefits everyone on Earth and our shared goals fulfill a scientific purpose to advance civilization.”

Axiom is building the world’s first commercial space station, known as Axiom Station. The University Alliance “will support and advance space science during the transition from government-led to commercially owned and operated space stations,” the company said in a release. Partnering universities will contribute to the research community by participating in international collaborative scientific initiatives, identifying future research, and bolstering strategic positions in the commercial orbit research field.

Recently, the Rice Space Institute was also selected to lead the U.S. Space Force Strategic Institute 4 in addition to other space-centric partnerships.

“We’re excited to bring our expertise to this global alliance and to benefit from the deep expertise of our partners,” David Alexander, professor of physics and astronomy and director of the Rice Space Institute, said in a news release. “Space is truly a collaborative and global endeavor. Alliances like these are key to progress.”

UH and NASA’s Johnson Space Center expanded their collaboration in 2022. In 2024, UH launched its NASA MIRO Inflatable Deployable Environments and Adaptive Space Systems Center (IDEAS2) via a five-year, $5 million grant.

“As a major public research university located in Space City, the University of Houston has a unique opportunity and responsibility to help lead the future of space innovation, and our participation in Axiom Space’s University Alliance represents a major step forward in that mission,” Karolos Grigoriadis, the Hugh Roy and Lillie Cranz Cullen Endowed Professor and chair of mechanical and aerospace engineering at UH, added in a separate release.

Meanwhile, Axiom recently tacked on an additional $175 million to a previously announced capital raise, bringing the oversubscribed round to a total of more than $525 million. It also has announced plans to launch Swiss and Japanese subsidiaries.

This Houston suburb named one of 10 newest boomtowns in U.S.

Booming 'Burb

What do you get when you combine a city's surge in population, housing growth, and economy? For the Houston suburb of Conroe, it adds up to being America's No. 9 newest boomtown, according to a new survey from SmartAsset.

The personal finance website's just-released report analyzed more than 400 U.S. cities with populations of 65,000 or more to identify places experiencing rapid growth based on five-year changes in economic output, housing units, and labor force size.

Texas is home to the second-highest concentration of new boomtowns in America with 18 out of 75 located in the Lone Star State. Only Florida ranks higher than Texas by just one.

However, Texas nearly locked out the top five most bustling boomtowns in America. Austin suburb Georgetown topped the list, and its Central Texas neighbors New Braunfels (No. 2) and Leander (No. 4) ranked close behind. Dallas-Fort Worth mid-city Lewisville claimed the No. 5 spot. Lehi, Utah ranked in third place.

Conroe has soared in popularity as one of America's most sought-after suburbs over the last several years, boosted by its renter-friendliness and its livability among the millennial generation.

Conroe has seen a 37 percent increase in housing units from 2019 to 2024, with its labor force growing by 33 percent during that time. SmartAsset also determined that Montgomery County's economic output grew at compound annual rates of 4.9 percent.

The report says population booms and "expanding business activity" can create "visible momentum" for an up-and-coming city, but these fast changes can alter a city in ways residents may not expect.

"In recent years, some American cities stand out for attracting people, investment and development at a pace that sets them apart," the report said. "Boomtown status does not mean growth benefits everyone equally, but it does reflect a city’s expanding economic capacity and the new opportunities that come with it."

America's top 10 new boomtowns are:

  • No. 1 – Georgetown
  • No. 2 – New Braunfels
  • No. 3 – Lehi, Utah
  • No. 4 – Leander
  • No. 5 – Lewisville
  • No. 6 – Palm Coast, Florida
  • No. 7 – Nampa, Idaho
  • No. 8 – McKinney
  • No. 9 – Conroe
  • No. 10 – Frisco
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This article originally appeared on CultureMap.com.