Twenty-six Houston-area companies landed on the latest Fortune 500 list. Photo via Getty Images

Houston maintained its No. 3 status this year among U.S. metro areas with the most Fortune 500 headquarters. Fortune magazine tallied 26 Fortune 500 headquarters in the Houston area, behind only the New York City area (62) and the Chicago area (30).

Last year, 23 Houston-area companies landed on the Fortune 500 list. Fortune bases the list on revenue that a public or private company earns during its 2024 budget year.

On the Fortune 500 list for 2025, Spring-based ExxonMobil remained the highest-ranked company based in the Houston area as well as in Texas, sitting at No. 8 nationally. That’s down one spot from its No. 7 perch on the 2024 list. During its 2024 budget year, ExxonMobil reported revenue of $349.6 billion, up from $344.6 billion the previous year.

Here are the rankings and 2024 revenue for the 25 other Houston-area companies that made this year’s Fortune 500:

  • No. 16 Chevron, $202.8 billion
  • No. 28 Phillips 66, $145.5 billion
  • No. 56 Sysco, $78.8 billion
  • No. 75 Conoco Phillips, $56.9 million
  • No. 78 Enterprise Products Partners, $56.2 billion
  • No. 92 Plains GP Holdings, $50 billion
  • No. 143 Hewlett-Packard Enterprise, $30.1 billion
  • No. 153 NRG Energy, $28.1 billion
  • No. 155 Baker Hughes, $27.8 billion
  • No. 159 Occidental Petroleum, $26.9 billion
  • No. 183 EOG Resources, $23.7 billion
  • No. 184 Quanta Services, $23.7 billion
  • No. 194 Halliburton, $23 billion
  • No. 197 Waste Management, $22.1 billion
  • No. 214 Group 1 Automotive, $19.9 billion
  • No. 224 Corebridge Financial, $18.8 billion
  • No. 256 Targa Resources, $16.4 billion
  • No. 275 Cheniere Energy, $15.7 billion
  • No. 289 Kinder Morgan, $15.1 billion
  • No. 345 Westlake Corp., $12.1 billion
  • No. 422 APA, $9.7 billion
  • No. 443 NOV, $8.9 billion
  • No. 450 CenterPoint Energy, $8.6 billion
  • No. 474 Par Pacific Holdings, $8 billion
  • No. 480 KBR Inc., $7.7 billion

Nationally, the top five Fortune 500 companies are:

  • Walmart
  • Amazon
  • UnitedHealth Group
  • Apple
  • CVS Health

“The Fortune 500 is a literal roadmap to the rise and fall of markets, a reliable playbook of the world's most important regions, services, and products, and an indispensable roster of those companies' dynamic leaders,” Anastasia Nyrkovskaya, CEO of Fortune Media, said in a news release.

Among the states, Texas ranks second for the number of Fortune 500 headquarters (54), preceded by California (58) and followed by New York (53).

Envana Software Solutions' tech allows an oil and gas company to see a full inventory of greenhouse gases. Photo via Getty Images

Houston joint venture secures $5.2M for AI-powered methane tracking tech

fresh funds

Houston-based Envana Software Solutions has received more than $5.2 million in federal and non-federal funding to support the development of technology for the oil and gas sector to monitor and reduce methane emissions.

Thanks to the work backed by the new funding, Envana says its suite of emissions management software will become the industry's first technology to allow an oil and gas company to obtain a full inventory of greenhouse gases.

The funding comes from a more than $4.2 million grant from the U.S. Department of Energy (DOE) and more than $1 million in non-federal funding.

“Methane is many times more potent than carbon dioxide and is responsible for approximately one-third of the warming from greenhouse gases occurring today,” Brad Crabtree, assistant secretary at DOE, said in 2024.

With the funding, Envana will expand artificial intelligence (AI) and physics-based models to help detect and track methane emissions at oil and gas facilities.

“We’re excited to strengthen our position as a leader in emissions and carbon management by integrating critical scientific and operational capabilities. These advancements will empower operators to achieve their methane mitigation targets, fulfill their sustainability objectives, and uphold their ESG commitments with greater efficiency and impact,” says Nagaraj Srinivasan, co-lead director of Envana.

In conjunction with this newly funded project, Envana will team up with universities and industry associations in Texas to:

  • Advance work on the mitigation of methane emissions
  • Set up internship programs
  • Boost workforce development
  • Promote environmental causes

Envana, a software-as-a-service (SaaS) startup, provides emissions management technology to forecast, track, measure and report industrial data for greenhouse gas emissions.

Founded in 2023, Envana is a joint venture between Houston-based Halliburton, a provider of products and services for the energy industry, and New York City-based Siguler Guff, a private equity firm. Siguler Gulf maintains an office in Houston.

“Envana provides breakthrough SaaS emissions management solutions and is the latest example of how innovation adds to sustainability in the oil and gas industry,” Rami Yassine, a senior vice president at Halliburton, said when the joint venture was announced.

Halliburton Labs has named its latest cohort. Photo courtesy of Halliburton

Halliburton names 5 clean energy startups to latest incubator cohort

clean team

Halliburton Labs has named five companies to its latest cohort, including one from Texas.

All of the companies are working to help accelerate the future of the energy industry in different ways. The incubator aims to advance the companies’ commercialization with support from Halliburton's network, facilities and financing opportunities.

The five new members include:

  • 360 Energy, an Austin-based in-field computing company with technology that is able to capture flared or stranded gas and monetize it through modular data centers
  • Cella, a New York-based mineral storage company that provides end-to-end services, from resource assessment to proprietary injection technology, and monitoring techniques to provide geologic carbon storage solutions
  • Espiku, an engineering services company based in Bend, Oregon, that finds solutions that advance water and minerals recovery from brines and industrial-produced water streams
  • Mitico, based in Los Angeles, that offers technology services to capture carbon dioxide by using its patent-pending granulated metal carbonate sorption technology (GMC) that captures more than 95% of the CO2 emitted from post-combustion point sources
  • NuCube, a Pasadena, California-based company with a nuclear fission reactor under development

“We welcome these innovative energy startups,” Dale Winger, managing director of Halliburton Labs, said in a news release. “We are eager to help these participant companies use their time and capital efficiently to progress new solutions that meet industry requirements for cost, reliability, and sustainability.”

Halliburton Labs also announced that it will host the Finalists Pitch Day on March 26, 2025, in Denver for energy and decarbonization industry innovators, startups and investors ahead of the National Renewable Energy Laboratory (NREL) Industry Growth Forum. The pitch event will precede registration and the opening reception of the NREL forum. Find more information here.

Adena Power, an Ohio-based clean energy startup, was the latest to join Halliburton Labs prior to the new cohort. The company used three patented materials to produce a sodium-based battery that delivers clean, safe and long-lasting energy storage.

The incubator also named San Francisco-based venture capital investor Pulakesh Mukherjee, partner at Imperative Ventures, which specializes in hard tech decarbonization startups, to its advisory board last spring.

Read more about the incubator's 2023 cohort here.

Adena Power uses three patented materials to produce a sodium-based battery that delivers clean, safe, long-lasting energy storage. Photo via adenapower.com

Sodium-based battery startup joins Halliburton Labs

new cohort co.

An Ohio-based clean energy startup has joined Houston-based Halliburton Labs, an incubator for early-stage energy tech companies.

Adena Power uses three patented materials to produce a sodium-based battery that delivers clean, safe, long-lasting energy storage. The startup is trying to capitalize on the 100 terawatt-hour potential for energy storage in the U.S. grid.

“With Halliburton Labs’ support and operational expertise, Adena Power looks to accelerate scaling and take advantage of the high-growth market opportunity,” Nathan Cooley, co-founder and CEO of Adena Power, says in a news release.

Adena, founded in 2022, supplies energy storage batteries for the commercial, industrial, and utility sectors. The startup has collected funding from four investors, according to PitchBook: OhioXcelerate, Third Derivative, BRITE Energy Innovators, and For ClimateTech.

Adena’s addition to Halliburton Labs comes during a momentous year for the company. For example:

  • Adena won the People’s Choice Award at the National Renewable Energy Labs Industry Growth Forum.
  • Adena earned the MAKE IT (Manufacture of Advanced Key Energy Infrastructure Technologies) Prize from the U.S. Department of Energy.

“Our team is ready to collaborate with Adena to help them accelerate their growth to meet the demand for behind-the-meter storage solutions,” says Dale Winger, managing director of Halliburton Labs.

Halliburton Labs is a wholly owned subsidiary of Halliburton, a provider of products and services for the energy industry. The incubator will have pitches at the inaugural Houston Energy and Climate Startup Week next month.

According to Halliburton, the pump will offer an “efficient, safe, and agile solution that streamlines geothermal operations and enhances overall performance.” Photo via halliburton.com

Halliburton introduces new pump technology designed for geothermal

fresh tech

Houston-based Halliburton has introduced a new technology that is designed specifically for geothermal energy applications.

The Summit ESP GeoESP is an advanced submersible borehole and surface pump technology GeoESP lifting pumps, which address challenges related to the transport of fluids to the surface through electric submersible pumps (ESP).

According to a news release from Halliburton, the pump will offer an “efficient, safe, and agile solution that streamlines geothermal operations and enhances overall performance.”

The inlet design minimizes power consumption, protects the pump against solids, and tackles scale formation. GeoESP lifting pumps can withstand extreme conditions with the ability to operate at temperatures up to 220°C (428°F) and can resist scale, corrosion, and abrasion.

GeoESP lifting pumps also use standard pump dimensions customized to suit various geothermal well conditions. With that, Halliburton will also offer a digital approach to geothermal well management with the Intelevat data science-driven platform to empower operators with real-time diagnostics and visualizations of “smart” field data. Halliburton states the system will improve well operations, increase production, extend system run life,reduce energy consumption, and minimize shutdowns.

“With increased global focus on low carbon energy sources, we are using our many decades of geothermal production expertise to help our customers maximize safety and improve efficiency,” Vice President of Artificial Lift Greg Schneider says in the release. “GeoESP lifting pumps build upon our current system to minimize power usage and help push the boundaries of what is possible with more complex well designs.”

Recently, more Houston-based companies have invested in geothermal technologies. GA Drilling and ZeroGeo Energy, a Swiss company specializing in renewable energy, announced a 12-megawatt Hot Dry Rock Geothermal Power Plant (Project THERMO), which is the first of several geothermal power and geothermal energy storage projects in Europe.

Additionally, Fervo Energy is exploring the potential for a geothermal energy system at Naval Air Station Fallon in Nevada. Sage Geosystems is working on an exploratory geothermal project for the Army’s Fort Bliss post in Texas. The Bliss project is the third U.S. Department of Defense geothermal initiative in the Lone Star State.

The Department of Energy announced two major initiatives that will reach the Gulf of Texas and Louisiana in U.S. Secretary of Energy Jennifer M. Granholm's address at CERAWeek by S&P Global in March. The Department of Energy’s latest Pathways to Commercial Liftoff report are initiatives established to provide investors with information of how specific energy technologies commercialize and what challenges they each have to overcome as they scale.

"Geothermal has such enormous potential,” she previously said during her address at CERAWEEK. “If we can capture the 'heat beneath our feet,' it can be the clean, reliable, base-load scalable power for everybody from industries to households."

Halliburton and ConocoPhillips were named to the 2023 Dow Jones Sustainability Indices. Photo via halliburton.com

2 Houston energy companies secure Dow Jones sustainability rating

seeing green

Halliburton and ConocoPhillips were named to the 2023 Dow Jones Sustainability Indices, which assesses the “sustainability performance of companies transparency process” based on an annual S&P Global Corporate Sustainability Assessment.

The CSA evaluates companies’ sustainability practices, and covers over 10,000 companies globally. The CSA has focused on financially material and industry-specific sustainability criteria since 1999.

The methodology of the annual CSA is updated to reflect the objectives to ensure that the CSA captures and delivers high-quality, material sustainability data, and increases efficiency and ease for participating companies. Over 13,000 companies get invited to participate in the CSA, but just 3,500 of the largest companies globally are eligible for inclusion.

In 2023, the DJSI saw a strong response from companies that disclosed their sustainability performance to capital markets through the CSA process.

For Halliburton, 2023 marks the third consecutive year that the company has been named to the prestigious list. Halliburton and ConocoPhillips are the only Houston companies that made the 2023 list.

“At Halliburton, we are constantly developing new and better ways to meet the growing global energy demand while advancing a more sustainable energy future,” Summer Condarco, senior vice president of Service Quality, Continuous Improvement, and Chief HSE Officer, says in a news release. “We are honored to be recognized by the Dow Jones Sustainability Indices for our commitment to sustainability leadership.”

See the full list of companies here.

Ad Placement 300x100
Ad Placement 300x600

CultureMap Emails are Awesome

Houston-based ENGIE to add new wind and solar projects to Texas grid

coming soon

Houston-based ENGIE North America Inc. has expanded its partnership with Los Angeles-based Ares Infrastructure Opportunities to add 730 megawatts of renewable energy projects to the ERCOT grid.

The new projects will include one wind and two solar projects in Texas.

“The continued growth of our relationship with Ares reflects the strength of ENGIE’s portfolio of assets and our track record of delivering, operating and financing growth in the U.S. despite challenging circumstances,” Dave Carroll, CEO and Chief Renewables Officer of ENGIE North America, said in a news release. “The addition of another 730 MW of generation to our existing relationship reflects the commitment both ENGIE and Ares have to meeting growing demand for power in the U.S. and our willingness to invest in meeting those needs.”

ENGIE has more than 11 gigawatts of renewable energy projects in operation or under construction in the U.S. and Canada, and 52.7 gigawatts worldwide. The company is targeting 95 gigawatts by 2030.

ENGIE launched three new community solar farms in Illinois since December, including the 2.5-megawatt Harmony community solar farm in Lena and the Knox 2A and Knox 2B projects in Galesburg.

The company's 600-megawatt Swenson Ranch Solar project near Abilene, Texas, is expected to go online in 2027 and will provide power for Meta, the parent company of social media platform Facebook. Late last year, ENGIE also signed a nine-year renewable energy supply agreement with AstraZeneca to support the pharmaceutical company’s manufacturing operations from its 114-megawatt Tyson Nick Solar Project in Lamar County, Texas.

Houston geothermal company raises $97M Series B

fresh funding

Houston-based geothermal energy startup Sage Geosystems has closed its Series B fundraising round and plans to use the money to launch its first commercial next-generation geothermal power generation facility.

Ormat Technologies and Carbon Direct Capital co-led the $97 million round, according to a press release from Sage. Existing investors Exa, Nabors, alfa8, Arch Meredith, Abilene Partners, Cubit Capital and Ignis H2 Energy also participated, as well as new investors SiteGround Capital and The UC Berkeley Foundation’s Climate Solutions Fund.

The new geothermal power generation facility will be located at one of Ormat Technologies' existing power plants. The Nevada-based company has geothermal power projects in the U.S. and numerous other countries around the world. The facility will use Sage’s proprietary pressure geothermal technology, which extracts geothermal heat energy from hot dry rock, an abundant geothermal resource.

“Pressure geothermal is designed to be commercial, scalable and deployable almost anywhere,” Cindy Taff, CEO of Sage Geosystems, said in the news release. “This Series B allows us to prove that at commercial scale, reflecting strong conviction from partners who understand both the urgency of energy demand and the criticality of firm power.”

Sage reports that partnering with the Ormat facility will allow it to market and scale up its pressure geothermal technology at a faster rate.

“This investment builds on the strong foundation we’ve established through our commercial agreement and reinforces Ormat’s commitment to accelerating geothermal development,” Doron Blachar, CEO of Ormat Technologies, added in the release. “Sage’s technical expertise and innovative approach are well aligned with Ormat’s strategy to move faster from concept to commercialization. We’re pleased to take this natural next step in a partnership we believe strongly in.”

In 2024, Sage agreed to deliver up to 150 megawatts of new geothermal baseload power to Meta, the parent company of Facebook. At the time, the companies reported that the project's first phase would aim to be operating in 2027.

The company also raised a $17 million Series A, led by Chesapeake Energy Corp., in 2024.

Houston expert discusses the clean energy founder's paradox

Guest Column

Everyone tells you to move fast and break things. In clean energy, moving fast without structural integrity means breaking the only planet we’ve got. This is the founder's paradox: you are building a company in an industry where the stakes are existential, the timelines are glacial, and the capital requires patience.

The myth of the lone genius in a garage doesn’t really apply here. Clean energy startups aren’t just fighting competitors. They are fighting physics, policy, and decades of existing infrastructure. This isn’t an app. You’re building something physical that has to work in the real world. It has to be cheaper, more reliable, and clearly better than fossil fuels. Being “green” alone isn’t enough. Scale is what matters.

Your biggest risks aren’t competitors. They’re interconnection delays, permitting timelines, supply chain fragility, and whether your first customer is willing to underwrite something that hasn’t been done before.

That reality creates a brutal filter. Successful founders in this space need deep technical knowledge and the ability to execute. You need to understand engineering, navigate regulation, and think in terms of markets and risk. You’re not just selling a product. You’re selling a future where your solution becomes the obvious choice. That means connecting short-term financial returns with long-term system change.

The capital is there, but it’s smarter and more demanding. Investors today have PhDs in electrochemistry and grid dynamics. They’ve been burned by promises of miracle materials that never left the lab. They don't fund visions; they fund pathways to impact that can scale and make financial sense. Your roadmap must show not just a brilliant invention, but a clear, believable plan to drive costs down over time.

Capital in this sector isn’t impressed by ambition alone. It wants evidence that risk is being retired in the right order — even if that means slower growth early.

Here’s the upside. The difficulty of clean energy is also its strength. If you succeed, your advantage isn’t just in software or branding. It’s in hardware, supply chains, approvals, and years of hard work that others can’t easily copy. Your real competitors aren’t other startups. They’re inertia and the existing system. Winning here isn’t zero-sum. When one solution scales, it helps the entire market grow.

So, to the founder in the lab, or running field tests at a remote site: your pace will feel slow. The validation cycles are long. But you are building in the physical world. When you succeed, you don’t have an exit. You have a foundation. You don't just have customers; you have converts. And the product you ship doesn't just generate revenue; it creates a legacy.

If your timelines feel uncomfortable compared to software, that’s because you’re operating inside a system designed to resist change. And let’s not forget you are building actual physical products that interact with a complex world. Times are tough. Don’t give up. We need you.

---

Nada Ahmed is the founding partner at Houston-based Energy Tech Nexus.