Top 100 Geothermal Companies in the World in 2026: The Ultimate Industry Guide
The global geothermal industry is entering a new phase of growth. Established geothermal operators continue to expand conventional hydrothermal power, while enhanced geothermal systems, closed loop designs, geothermal lithium extraction, advanced drilling, and geothermal heating technologies are opening new markets.
Geothermal power remains one of the few renewable energy sources capable of supplying firm electricity around the clock. Its ability to operate independently of sunshine and wind makes it increasingly valuable to utilities, industrial users, manufacturers, and data centers seeking reliable low carbon power.
This guide profiles 100 of the most influential companies, developers, manufacturers, drilling contractors, technology providers, startups, and industry organizations shaping the geothermal sector in 2026. The ranking is organized by market influence, operating capacity, technology, project pipeline, financial strength, geographic reach, and strategic importance.
Why the Geothermal Industry Matters in 2026
Global geothermal power capacity reached approximately 15.4 GW at the end of 2024, according to the International Renewable Energy Agency. Around 0.4 GW of new geothermal capacity was added during 2024, although the industry is expected to accelerate as enhanced geothermal systems and improved drilling technologies reduce geographic limitations.
The International Energy Agency estimates that geothermal energy could provide up to 15 percent of global electricity demand growth through 2050 if technology improvements reduce development costs. Under this scenario, global geothermal capacity could reach approximately 800 GW.
Several market trends are driving the sector forward:
- Enhanced geothermal systems are applying horizontal drilling and hydraulic stimulation techniques from the oil and gas industry.
- Closed loop geothermal systems are reducing dependence on naturally permeable reservoirs.
- Geothermal lithium projects are combining renewable power production with critical minerals extraction.
- Data center operators are seeking reliable, clean electricity that can complement intermittent wind and solar power.
- Government incentives are improving project economics in the United States, Europe, Indonesia, Kenya, and other geothermal markets.
- Advanced drilling tools are targeting hotter and deeper resources that were previously considered uneconomic.
Fervo Energy’s Cape Station project illustrates the changing investment environment. In 2026, the company secured approximately $421 million in non recourse project financing for its first project phase, a structure that linked repayment to the project’s assets and cash flows rather than solely to the corporate balance sheet.
How the Companies Were Selected
This list includes companies from several parts of the geothermal value chain. It is not limited to power plant owners.
The ranking considers:
- Operating geothermal electricity and heat capacity.
- The size and maturity of development pipelines.
- Technological innovation in drilling, reservoirs, power conversion, heating, and mineral extraction.
- Financial resources, project financing, and strategic partnerships.
- Geographic diversification.
- Importance to national geothermal markets.
- Influence on future geothermal commercialization.
Some companies are ranked because they own and operate large geothermal fleets. Others are included because their drilling equipment, reservoir services, software, or advanced geothermal technology could influence the next generation of projects.
Capacity figures may vary depending on whether a company reports direct ownership, joint venture capacity, contracted capacity, or total field capacity. Project announcements and financing details can also change as construction schedules, permits, and commercial agreements evolve.
Tier One: Global Geothermal Giants
Pertamina Geothermal Energy, Indonesia
Pertamina Geothermal Energy is one of the world’s largest geothermal operators and the leading geothermal company in Indonesia. The company has reported total capacity of approximately 1,878 MW when direct ownership and joint operating contract capacity are combined.
Its portfolio includes Kamojang, Lahendong, Ulubelu, Sibayak, Karaha, and Lumut Balai. Indonesia has some of the world’s largest untapped geothermal resources, and Pertamina Geothermal Energy is central to the country’s strategy for expanding renewable electricity.
The company’s joint operating contract model allows it to work with international partners while sharing exploration, construction, and
Ormat Technologies, United States
Ormat Technologies is the leading publicly traded pure play geothermal company. The company designs, manufactures, develops, owns, and operates geothermal power facilities in the United States and international markets.
Its geothermal portfolio includes projects in Nevada, California, Kenya, Guatemala, Indonesia, Honduras, and Guadeloupe. Major assets include the McGinness Hills complex in Nevada, the Olkaria III plant in Kenya, and a stake in the Sarulla geothermal project in Indonesia.
Ormat’s vertically integrated business model is a major competitive advantage. It can provide equipment, engineering, construction, operations, and maintenance services within the same corporate platform. This creates multiple revenue streams and gives the company exposure to both new development and long term plant operations.
Enel Green Power, Italy
Enel Green Power operates one of the world’s most important geothermal portfolios in Tuscany, Italy. Its operations are concentrated in the historic Larderello geothermal region, where geothermal electricity generation began more than a century ago.
The company operates dozens of geothermal units in Tuscany, including the large Valle Secolo facility. Its portfolio uses conventional steam technology, flash systems, binary cycle systems, and integrated resource management.
Enel’s long experience in Tuscany provides a significant advantage in reservoir monitoring, reinjection, plant optimization, and resource sustainability. The company also has the financial capacity to evaluate geothermal opportunities in other countries.
4. Calpine Energy, United States
Calpine is the principal operator of The Geysers geothermal field in Northern California, widely recognized as the largest geothermal complex in the world.
The Geysers contains a large group of geothermal power plants that have supplied electricity to California for decades. Calpine’s operations rely on steam production, reservoir management, reinjection, and continuous plant optimization.
The company’s geothermal business is particularly important because it demonstrates the long operating life possible from a well managed geothermal reservoir. Wastewater reinjection programs have helped maintain reservoir pressure and support continued production.
Calpine also participates in power purchase agreements with other geothermal companies, including arrangements involving output from Ormat’s Mammoth geothermal facilities.
5. Kenya Electricity Generating Company, Kenya
KenGen is Kenya’s largest electricity generator and Africa’s leading geothermal power company. Its geothermal portfolio is concentrated in the Olkaria region within the East African Rift.
The company operates several Olkaria facilities, including Olkaria I, Olkaria II, Olkaria I Additional Units, Olkaria IV, Olkaria V, and wellhead power plants. KenGen’s geothermal capacity has grown to more than 700 MW, making geothermal a central part of Kenya’s electricity system.
KenGen has demonstrated how geothermal energy can support economic development in an emerging market. Its projects provide firm power, reduce exposure to imported fuels, and complement hydropower during periods of drought.
6. ON Power, Iceland
ON Power, also known as Orka náttúrunnar, operates major geothermal facilities in Iceland. Its best known plants are Hellisheiði and Nesjavellir, which supply both electricity and hot water.
Hellisheiði produces approximately 303 MW of electricity and substantial thermal energy for district heating. The plant supplies hot water to the Reykjavík capital region and demonstrates the benefits of using geothermal resources for several purposes.
ON Power is also associated with Carbfix, a carbon capture and mineralization technology that permanently stores carbon dioxide and hydrogen sulfide in underground rock formations. This combination of geothermal energy, district heating, and carbon management makes Iceland one of the most advanced geothermal markets in the world.
7. Energy Development Corporation, Philippines
Energy Development Corporation is the Philippines’ leading geothermal developer and a major affiliate of the Aboitiz Group.
The company operates geothermal assets across the Philippines, including projects in Luzon, the Visayas, and Mindanao. Its portfolio includes conventional geothermal power plants and binary technology used to recover energy from lower temperature resources.
The Philippines is one of the world’s leading geothermal markets because of its volcanic geology and substantial electricity demand. Energy Development Corporation plays a major role in providing renewable baseload power and supporting national energy security.
8. Meridian Energy, New Zealand
Meridian Energy is one of New Zealand’s major renewable energy companies, with a portfolio that combines hydropower, geothermal power, and other renewable resources.
Its geothermal interests include participation in major fields such as Kawerau, Ngatamariki, and Rotokawa. New Zealand’s geothermal sector benefits from decades of experience in reservoir management, resource assessment, plant development, and industrial heat use.
Meridian’s geothermal assets complement its hydropower portfolio by adding firm renewable generation that is less dependent on rainfall and reservoir levels.
Tier Two: Major Developers and Independent Companies
9. Fervo Energy, United States
Fervo Energy is one of the most important enhanced geothermal systems companies in the world. It uses horizontal drilling, hydraulic stimulation, fiber optic monitoring, and oilfield development techniques to create engineered geothermal reservoirs.
Its Cape Station project in Utah is designed to become a large scale source of firm, carbon free electricity. The first phase is planned to deliver approximately 100 MW, with later phases expected to expand the project substantially.
Fervo’s 2026 project financing was significant because it demonstrated that an enhanced geothermal project could attract non recourse infrastructure debt. The company also completed a public offering on Nasdaq in May 2026, increasing its visibility among public market investors.
10. Eavor Technologies, Canada
Eavor Technologies has developed a closed loop geothermal system that circulates working fluid through a network of underground wells. Unlike conventional geothermal plants, the system does not require a naturally productive reservoir.
The company’s technology is designed to reduce exploration risk and avoid the need for large scale hydraulic stimulation. This could make geothermal development possible in regions without conventional high permeability resources.
Eavor has focused heavily on Europe, particularly Germany, where district heating and industrial decarbonization create significant market opportunities.
11. Vulcan Energy Resources, Germany
Vulcan Energy Resources is developing an integrated geothermal and lithium project in Germany’s Upper Rhine Valley.
The company’s Lionheart project is designed to produce geothermal electricity and heat while extracting lithium hydroxide from geothermal brine. This dual revenue model could improve project economics and support Europe’s battery supply chain.
Vulcan’s strategy responds to two major European priorities, increasing domestic renewable energy production and reducing dependence on imported critical minerals.
12. Geothermal Development Company, Kenya
The Geothermal Development Company, commonly known as GDC, is a Kenyan state owned enterprise responsible for developing geothermal steam fields.
GDC separates steam field exploration and development from power plant construction. It can drill production and reinjection wells, establish steam gathering systems, and then sell steam to KenGen or private power producers.
This model reduces exploration risk for independent power producers and has helped Kenya attract geothermal investment. GDC is involved in fields including Menengai, Paka, Silali, Eburru, and parts of Olkaria.
13. Terra Gen Power, United States
Terra Gen Power is an independent renewable energy developer with experience across geothermal, solar, and energy storage.
Its geothermal activities have focused on the western United States, where geothermal resources can be combined with solar generation and storage to create more flexible renewable power portfolios.
The company’s integration into a larger renewable energy platform highlights the growing value of hybrid projects that combine firm geothermal generation with variable renewable technologies.
14. Controlled Thermal Resources, United States
Controlled Thermal Resources is developing geothermal and lithium projects in California’s Imperial Valley.
The company’s strategy is based on extracting lithium from geothermal brines while generating renewable electricity. Imperial Valley has an important geothermal resource base and is also close to major electric vehicle and battery manufacturing markets.
The combination of geothermal power and lithium extraction gives the company exposure to both renewable energy and critical minerals markets.
15. GreenFire Energy, United States
GreenFire Energy develops advanced geothermal systems, including closed loop and engineered reservoir technologies.
Its approach is designed to expand geothermal development beyond conventional hydrothermal fields. The company’s technology portfolio addresses several barriers, including resource uncertainty, reservoir permeability, and project location.
GreenFire has attracted interest from investors and energy industry professionals seeking scalable geothermal technology that can use existing drilling expertise.
16. Sage Geosystems, United States
Sage Geosystems is developing a technology platform that combines geothermal energy production with subsurface pressure management.
Its GeoPressurized Geothermal system is designed to store and produce energy through engineered underground formations. The company’s approach sits between conventional geothermal generation and long duration energy storage.
Sage is particularly relevant to electricity markets seeking firm renewable power and grid balancing capacity.
17. Quaise Energy, United States
Quaise Energy is developing deep drilling technology based on millimeter wave energy and gyrotron systems.
The company aims to drill into very hot, deep rock formations that could contain enormous geothermal energy resources. Its technology could eventually reduce dependence on conventional mechanical drilling at extreme depths.
Although the technology remains in the development and demonstration stage, its potential impact is significant. Successful commercial deployment could expand geothermal resources far beyond volcanic regions.
18. Bedrock Energy, United States
Bedrock Energy focuses on geothermal heating and cooling for commercial and industrial buildings.
The company develops drilling and design methods for geothermal heat pump systems that can reduce building emissions and operating costs. Its market is closely connected to the broader building electrification and decarbonization movement.
Unlike power focused geothermal developers, Bedrock targets a much larger potential market involving offices, warehouses, campuses, hospitals, and industrial facilities.
19. Ameresco, United States
Ameresco is an energy services company involved in energy efficiency, renewable energy, storage, infrastructure modernization, and distributed energy systems.
Its geothermal activities form part of a broader portfolio rather than a pure geothermal business. The company can combine geothermal heating, solar power, storage, efficiency improvements, and energy management for institutional and commercial customers.
This integrated model is useful for customers that prefer a single contractor for complex energy transition projects.
20. Zanskar, United States
Zanskar develops geothermal exploration technology and uses data science to identify promising geothermal resources.
The company combines geological information, remote sensing, machine learning, and subsurface analysis to improve exploration success rates. Its work is important because unsuccessful exploration wells remain one of the largest risks in geothermal development.
Zanskar is also associated with the growing convergence between geothermal development and mineral extraction.
Regional Geothermal Leaders
21. Tokyo Electric Power Company
Tokyo Electric Power Company, commonly known as TEPCO, is one of Japan’s largest electricity companies. Japan has significant geothermal potential, although development has historically been constrained by environmental, regulatory, and land use considerations.
TEPCO participates in research, energy development, and renewable energy initiatives that may support geothermal expansion.
22. Reykjavík Energy
Reykjavík Energy is the parent organization associated with ON Power. It has extensive experience in geothermal electricity generation, district heating, water services, and resource management.
Its integrated business model demonstrates how geothermal energy can support electricity, heating, industrial activity, and urban infrastructure within one system.
23. PT PLN
PT PLN is Indonesia’s national electricity utility. Although it does not own every geothermal asset in the country, it is central to grid connection, power procurement, transmission planning, and partnerships with geothermal developers.
PLN’s purchasing agreements are important for the bankability of geothermal projects developed by Pertamina Geothermal Energy and private operators.
24. Aboitiz Power
Aboitiz Power is a major Philippine energy company and parent group associated with Energy Development Corporation.
Its investments span geothermal, hydropower, solar, and other electricity assets. Through its geothermal portfolio, the company contributes to the Philippines’ renewable power capacity and grid reliability.
25. Mercury Energy
Mercury Energy is a New Zealand electricity generator and retailer with substantial geothermal and hydropower interests.
Its geothermal portfolio supports New Zealand’s renewable electricity system and provides a stable complement to variable renewable generation.
26. Orkuveita Reykjavíkur
Orkuveita Reykjavíkur is an Icelandic utility involved in geothermal heating, electricity, water, and energy infrastructure.
The company demonstrates the value of integrated geothermal development, especially in regions where direct heat use may be as important as power generation.
27. Enexa
Enexa is an Icelandic energy company involved in geothermal development and related energy projects.
Iceland’s expertise in geothermal engineering, resource management, district heating, and carbon mineralization gives companies operating in the country a strong technical foundation.
<h3>28. Landsvirkjun</h3>
Landsvirkjun is Iceland’s national power company. Its portfolio is dominated by hydropower, but it also has experience with geothermal resources and renewable energy development.
The company contributes to Iceland’s position as one of the world’s most renewable electricity systems.
29. Geothermal Energy Nigeria
Geothermal Energy Nigeria represents the emerging interest in geothermal resources in Nigeria and West Africa.
Although the Nigerian geothermal market remains at an early stage, growing electricity demand, energy access needs, and interest in diversified renewable generation could support future exploration.
30. Ethiopian Electric Power
Ethiopian Electric Power is involved in the development of geothermal projects such as Aluto Langano and Corbetti.
Ethiopia has substantial geothermal potential in the East African Rift. Development could help diversify the country’s hydropower dominated electricity system and provide reliable renewable electricity during dry periods.
Equipment Manufacturers and EPC Companies
31. Mitsubishi Heavy Industries
Mitsubishi Heavy Industries manufactures geothermal turbines, generators, and power plant equipment. Its technology has been used in geothermal markets across Asia and other regions.
The company benefits from extensive experience in large power generation systems and complex engineering projects.
32. Fuji Electric
Fuji Electric is a major supplier of geothermal turbines, generators, control systems, and power plant equipment.
Its geothermal technology is widely recognized in Japan and international markets. The company supports both new construction and plant modernization.
33. Toshiba Energy Systems
Toshiba has a long history of manufacturing geothermal turbines and generators. Its equipment has been installed in numerous geothermal fields around the world.
Toshiba’s role includes turbine supply, engineering, control systems, and lifecycle support.
34. Ansaldo Energia
Ansaldo Energia provides power generation equipment and engineering services, including geothermal technology.
The Italian company benefits from its proximity to Italy’s historic geothermal industry and its broader experience in thermal and renewable power systems.
35. Baker Hughes
Baker Hughes provides drilling equipment, well services, reservoir technology, and energy engineering expertise.
As geothermal projects increasingly adopt oilfield drilling techniques, companies with experience in high temperature wells, directional drilling, completion systems, and subsurface monitoring are becoming important industry partners.
36. SLB
SLB, formerly known as Schlumberger, offers drilling, well construction, reservoir evaluation, production technology, and digital services.
Its expertise can support geothermal developers that require advanced well design, drilling optimization, logging, stimulation, and reservoir analysis.
37. Halliburton
Halliburton is a major oilfield services company with capabilities relevant to geothermal well construction and stimulation.
Its technologies include cementing, completion systems, drilling services, formation evaluation, and reservoir management.
38. Nabors Industries
Nabors Industries supplies drilling rigs and drilling services. Its experience with high specification land drilling rigs can be adapted to geothermal projects.
The company is particularly relevant to developers seeking deeper wells and more complex directional drilling designs.
39. Weatherford International International
Weatherford provides well construction, completion, production, and reservoir services.
Geothermal projects can use these capabilities to improve drilling performance, manage high temperature environments, and extend well productivity.
40. Epiroc
Epiroc manufactures drilling equipment and mining technology used in surface and underground applications.
Its equipment can support geothermal drilling, ground source heat pump boreholes, exploration, and subsurface construction.
Geothermal Drilling Specialists
41. KCA Deuta
KCA Deutag is a drilling contractor with experience in land drilling and energy infrastructure.
Its rig operations and well construction capabilities may support geothermal projects requiring large diameter wells, directional drilling, and high temperature operations.
42. Huisman Equipment
Huisman designs and manufactures drilling rigs and specialized equipment.
The company has developed systems for challenging drilling environments and can support geothermal developers seeking mobile and customized drilling solutions.
43. Geotech Drilling Services
Geotech Drilling Services is associated with drilling and geotechnical work in Canada.
Its capabilities are relevant to geothermal heat pump installations, exploration wells, and subsurface testing.
44. Fraste
Fraste manufactures drilling rigs used in geotechnical, water well, environmental, and geothermal applications.
Its equipment is suitable for smaller scale geothermal heating and cooling projects as well as exploratory work.
45. Deep Rock Manufacturing
Deep Rock Manufacturing develops drilling equipment for geothermal, water well, environmental, and geotechnical markets.
Its products support contractors working on boreholes, heat pump installations, and resource assessment.
46. Marton Geotechnical Services
Marton Geotechnical Services provides drilling and geotechnical services in the United Kingdom.
The company is relevant to shallow geothermal projects, ground source heat pump systems, and subsurface investigation.
47. Helmerich and Payne
Helmerich and Payne is a major land drilling contractor with advanced rig technologies.
The company’s high specification drilling systems and automation capabilities could support geothermal projects that require precision, reliability, and reduced drilling time.
48. Precision Drilling
Precision Drilling is one of Canada’s major drilling contractors.
Its experience with technically demanding wells, drilling automation, and rig operations is relevant to geothermal developers exploring North American resources.
49. National Oilwell Varco
National Oilwell Varco, commonly known as NOV, supplies drilling equipment, well construction systems, completion tools, and industrial components.
NOV’s broad equipment portfolio gives it exposure to geothermal projects at several stages of the development cycle.
50. MHWirth
MHWirth, associated with Aker Solutions, provides drilling and well construction systems.
Its equipment and engineering expertise can support geothermal drilling programs, especially those requiring advanced rig technologies and high reliability.
51. Ensign Energy Services
Ensign Energy Services is a Canadian drilling contractor with experience in land based drilling.
The company’s rig fleet and drilling personnel can support geothermal projects as the sector expands beyond traditional oil and gas markets.
52. Basic Energy Services
Basic Energy Services provides oilfield and well services in the United States.
Its technical capabilities may be applicable to geothermal work involving well maintenance, completion, stimulation, and field services.
53. ATB Drilling
ATB Drilling provides drilling services in the United Kingdom and is active in ground source and geothermal applications.
Its work is particularly relevant to shallow geothermal heating and cooling systems.
54. Geo Drill
Geo Drill provides drilling services for geothermal and ground source heat pump projects.
Its work supports residential, commercial, and industrial applications requiring borehole installation and subsurface engineering.
55. ABR Erdwärme
ABR Erdwärme is a German geothermal drilling company serving the ground source heating and geothermal development market.
Germany’s expanding interest in geothermal district heating creates opportunities for specialized drilling contractors.
56. Aquifex GS
Aquifex GS provides geothermal drilling and ground source heat pump services in Germany.
Its work supports the development of shallow and medium depth geothermal systems for buildings and local heating networks.
57. Drillexpert
Drillexpert provides drilling services and technical support for geothermal and related subsurface projects.
Its role is representative of the specialized contractors needed to expand geothermal heating across Europe.
58. ERBOTEC Josef Demski
ERBOTEC Josef Demski operates in the German drilling and geothermal services market.
The company supports borehole drilling, geothermal probe installation, and related subsurface construction activities.
59. Sven Fischer Bohrtechnik
Sven Fischer Bohrtechnik provides drilling services for geothermal and geotechnical applications.
Its work contributes to the growing German ground source heat pump and geothermal heating industry.
60. Sven Hansen Wasser und Brunnenbautechnik
Sven Hansen Wasser und Brunnenbautechnik provides drilling and well construction services.
The company’s capabilities may support geothermal boreholes, water wells, and related subsurface infrastructure.
Next Generation Geothermal Startups
61. Hephae Energy Technology
Hephae Energy Technology is developing high temperature drilling technology for geothermal applications.
Its goal is to improve access to deeper and hotter resources while reducing the cost and technical complexity of drilling.
62. GeoGenCo
GeoGenCo is a geothermal development company focused on identifying and advancing new projects.
Its role is important because smaller developers often provide the early stage project development needed before large utilities and infrastructure investors enter the market.
63. TEVERRA
TEVERRA works across geothermal energy, carbon storage, and subsurface development.
The company’s integrated approach reflects the growing overlap between geothermal reservoirs, carbon management, and underground energy infrastructure.
64. Arverne
Arverne combines geothermal development with brine chemistry and mineral extraction.
Its strategy reflects Europe’s interest in using geothermal resources to supply both clean energy and critical raw materials.
65. AltaRock Energy
AltaRock Energy is a leading developer of enhanced geothermal systems technology.
The company has worked on engineered geothermal reservoirs and stimulation methods designed to expand geothermal development into areas without naturally productive hydrothermal fields.
66. Bestec
Bestec is a German company involved in geothermal equipment and related technologies.
Its work supports the European geothermal supply chain, particularly in heating, drilling, and plant systems.
67. Fervo Energy Canada
Fervo Energy’s expansion into Canada would support the broader North American market for enhanced geothermal systems.
Canada has significant potential for deep geothermal power and extensive drilling expertise from its oil and gas sector.
68. Eavor Germany
Eavor’s German activities focus on closed loop geothermal deployment.
Germany’s district heating market, industrial heat demand, and energy transition policies make it a key market for closed loop systems.
69. Vulcan Energy UK
Vulcan Energy’s wider European expansion reflects the potential for geothermal lithium projects beyond Germany.
The company’s approach combines clean power, heat, and battery material production.
70. Sage Geosystems Europe
Sage Geosystems Europe represents the potential licensing and deployment of pressure based geothermal systems in European markets.
The region’s need for firm renewable electricity and long duration energy storage creates opportunities for this technology.
71. Quaise Energy Europe
Quaise Energy’s European partnerships could help demonstrate deep drilling technology in countries with strong scientific, industrial, and geothermal expertise.
Commercial success would depend on proving drilling reliability, cost competitiveness, and well integrity at extreme temperatures.
72. GreenFire Canada
GreenFire’s Canadian presence focuses on closed loop and advanced geothermal systems.
Canada’s large land area, industrial heat demand, and drilling workforce make it a promising market for next generation geothermal development.
73. Bedrock Energy Europe
Bedrock Energy’s European activities target geothermal heating and cooling for commercial buildings.
The company’s technology is aligned with European efforts to reduce gas consumption and decarbonize urban heat.
74. Zanskar Minerals
Zanskar Minerals represents the convergence of geothermal exploration and critical minerals analysis.
Improved subsurface mapping could help identify both geothermal reservoirs and mineral rich brines.
75. Controlled Thermal Resources Europe
Controlled Thermal Resources’ European potential lies in applying geothermal lithium production models to regions with suitable brine chemistry and strong battery supply chains.
76. Terra Gen Europe
Terra Gen Europe represents the potential expansion of renewable independent power production into European geothermal markets.
Its experience with hybrid renewable projects could support geothermal, solar, and storage combinations.
77. Ameresco International
Ameresco International can support geothermal development through integrated energy services, efficiency upgrades, renewable generation, and storage.
78. Ormat Europe
Ormat Europe supplies geothermal equipment, engineering services, and operating expertise to European developers.
Its binary cycle technology is particularly valuable for medium temperature geothermal resources.
79. Calpine Europe
Calpine Europe represents potential geothermal development and power market activity outside the company’s established North American base.
80. Enel Green Power America
Enel Green Power Americas supports geothermal development across Latin America, where volcanic resources and electricity demand create significant opportunities.
Geothermal Heating and Cooling Companies
81. Geothermal Resources
Geothermal Resources serves the United Kingdom ground source heat pump market through geothermal installation and related services.
82. Kensa
Kensa is a major UK company specializing in ground source heat pumps and shared ground loop systems.
Its technology supports residential developments, social housing, commercial buildings, and district heating applications.
83. NIBE Energy Systems
NIBE is a Swedish manufacturer of heat pumps and heating systems.
Its geothermal and ground source heat pump products serve residential and commercial markets across Europe and other regions.
84. Viessmann
Viessmann manufactures heating, cooling, and energy systems, including ground source heat pumps.
The company benefits from strong distribution networks and extensive experience in building energy technology.
85. Bosch Thermotechnology
Bosch Thermotechnology provides heating and cooling equipment, including geothermal heat pump systems.
Its global brand, engineering expertise, and installer network make it an important participant in the building electrification market.
86. WaterFurnace
WaterFurnace is a major North American manufacturer of geothermal heat pumps.
Its products are used in homes, commercial buildings, schools, healthcare facilities, and other applications.
87. ClimateMaster
ClimateMaster develops geothermal heat pumps for residential, commercial, and institutional customers.
The company is one of the most recognized geothermal HVAC brands in North America.
88. GeoComfort
GeoComfort manufactures geothermal heat pump systems for residential and commercial applications.
Its products are designed to deliver efficient heating and cooling using stable ground temperatures.
89. Enertech
Enertech develops geothermal and water source heat pump systems.
The company serves building owners, contractors, and distributors seeking electrified heating and cooling solutions.
90. Geothermal Energy Association
The Geothermal Energy Association has historically supported geothermal policy, market education, and industry advocacy in the United States.
Industry associations remain important for public education, regulatory engagement, and workforce development.
Geothermal Industry Organizations and Information Platforms
92. International Geothermal Association
The International Geothermal Association promotes geothermal energy worldwide.
It connects developers, researchers, utilities, manufacturers, policymakers, and technical professionals.
93. Geothermal Resources Council
The Geothermal Resources Council supports geothermal education, technical exchange, conferences, and professional development in the United States and internationally.
94. European Geothermal Energy Council
The European Geothermal Energy Council advocates for geothermal power, heating, cooling, and underground energy technologies across Europe.
It works on policy, market development, standards, and industry representation.
95. Geothermal Rising
Geothermal Rising is a professional organization focused on advancing geothermal energy in the United States.
Its activities include education, networking, workforce development, policy engagement, and industry events.
96. StartUs Insights
StartUs Insights tracks emerging technology companies and innovation trends across the geothermal sector.
Its databases can help investors, researchers, and corporate development teams identify startups and technologies.
97. F6S Geothermal
F6S provides startup information, funding data, accelerator connections, and company profiles.
Its geothermal listings can be useful for identifying early stage companies and investment opportunities.
98. Tracxn Geothermal
Tracxn provides company intelligence, funding information, startup tracking, and market databases.
Its platform is useful for analyzing the rapidly changing geothermal technology landscape.
99. Ensun
Ensun provides company directories and technology market information.
Its geothermal listings can help users identify equipment suppliers, developers, consultants, and service providers.
100. Geothermal Finder
Geothermal Finder helps users locate geothermal installers, contractors, and service providers, particularly in North American markets.
Directories such as this are important for connecting consumers, developers, and building owners with qualified geothermal professionals.
Major Geothermal Investment Themes
Enhanced Geothermal Systems
Enhanced geothermal systems could expand geothermal power beyond areas with naturally permeable reservoirs. Companies such as Fervo Energy, Sage Geosystems, AltaRock Energy, and GreenFire Energy are developing different approaches to reservoir creation, stimulation, pressure management, and monitoring.
The key commercial questions involve drilling cost, stimulation performance, induced seismicity, water management, well productivity, and long term reservoir sustainability.
Closed Loop Geothermal
Closed loop geothermal systems circulate fluid through sealed underground wells rather than relying on natural fluid flow through a reservoir.
This approach may reduce exploration risk and simplify permitting. However, developers must demonstrate competitive heat transfer rates, drilling economics, durability, and commercial scale performance.
Geothermal Lithium
Geothermal lithium projects seek to extract lithium from hot underground brines while generating electricity and heat.
The model could create several revenue streams from one resource. Its success depends on lithium concentration, extraction technology, reinjection performance, chemical processing costs, environmental safeguards, and long term commodity prices.
Geothermal for Data Centers
Data centers require reliable electricity throughout the day and night. Geothermal energy can provide firm generation without the direct emissions associated with fossil fuel power plants.
Long term power purchase agreements with technology companies could improve project bankability and accelerate development in regions with suitable resources.
Geothermal District Heating
District heating is one of the largest potential markets for geothermal energy. It can replace natural gas, coal, and oil in urban heating networks while reducing exposure to fuel price volatility.
Germany, Iceland, France, Poland, the United States, and parts of Eastern Europe are potential growth markets for geothermal district heating.
Advanced Drilling
Drilling remains one of the largest cost components in geothermal development. Companies developing high temperature tools, improved well designs, automated rigs, advanced logging systems, and deep drilling technologies could significantly reduce project costs.
Innovations from the oil and gas sector will continue to influence geothermal development, particularly in enhanced geothermal systems.
How Stakeholders Can Use This List
Investors can use the list to identify publicly traded geothermal operators, diversified renewable companies, private developers, and technology startups. However, geothermal investments require careful analysis of resource risk, drilling budgets, permitting, power prices, financing structures, and reservoir performance.
Engineers and job seekers can use the list to identify employers across plant operations, reservoir engineering, drilling, geoscience, equipment manufacturing, project finance, construction, and energy policy.
Developers can use the list to identify potential partners for exploration, drilling, plant construction, power conversion, transmission, lithium extraction, and operations and maintenance.
Journalists and researchers can use the companies as starting points for investigating new projects, financing announcements, technology demonstrations, mergers, acquisitions, and national energy policies.
Students can compare conventional hydrothermal power with enhanced geothermal systems, closed loop designs, geothermal heat pumps, and geothermal lithium projects.
Future Outlook Through 2030
The geothermal industry is likely to become more diverse through 2030. Conventional geothermal power will remain important in Indonesia, the Philippines, Kenya, Iceland, Italy, New Zealand, Turkey, and the western United States.
At the same time, next generation systems could create new markets in regions that lack traditional volcanic geothermal resources. The United States is particularly important because it combines strong drilling expertise, substantial tax incentives, technology investment, and growing demand from data centers.
Europe is likely to focus on geothermal district heating, industrial heat, lithium extraction, and closed loop systems. Germany’s Upper Rhine Valley could become a major center for integrated geothermal and mineral development.
Africa has some of the world’s most promising geothermal resources, especially along the East African Rift. Kenya is expected to remain the regional leader, while Ethiopia, Tanzania, Djibouti, and Rwanda could develop additional projects as financing and technical capacity improve.
Indonesia and the Philippines will remain central to global geothermal growth because of their large volcanic resources and expanding electricity needs.
The most successful companies will likely be those that can control drilling risk, secure long term offtake agreements, manage reservoirs sustainably, obtain project financing, and integrate geothermal power with heat, storage, or mineral production.
Frequently Asked Questions
Which company is the largest geothermal company in the world?
Pertamina Geothermal Energy is widely regarded as one of the largest geothermal operators by combined direct and joint operating contract capacity. Its portfolio spans several major Indonesian geothermal fields.
Which geothermal company is best positioned for enhanced geothermal systems?
Fervo Energy is one of the leading enhanced geothermal systems developers. Its Cape Station project and project financing have made it one of the most closely watched companies in the next generation geothermal sector.[3]
What are the leading geothermal drilling companies?
Major drilling and well service companies relevant to geothermal include Baker Hughes, SLB, Halliburton, Nabors Industries, Weatherford, KCA Deutag, Precision Drilling, NOV, and Helmerich and Payne.
Which companies are combining geothermal energy with lithium extraction?
Vulcan Energy Resources and Controlled Thermal Resources are among the best known companies pursuing geothermal lithium projects. Several other developers are also studying mineral extraction from geothermal brines.
Which African companies lead the geothermal industry?
KenGen and the Geothermal Development Company are the leading geothermal organizations in Kenya. Ethiopia, Djibouti, Tanzania, and Rwanda also have geothermal development potential.
Is geothermal energy a good investment in 2026?
Geothermal energy offers long term growth potential because it provides firm renewable power, low carbon heat, and possible critical minerals revenue. However, investors should assess exploration risk, drilling costs, permitting, project financing, reservoir performance, electricity prices, and company specific financial conditions before making decisions.
Conclusion
The global geothermal industry is expanding beyond its traditional base of volcanic hydrothermal resources. Established operators such as Pertamina Geothermal Energy, Ormat Technologies, Enel Green Power, Calpine, KenGen, ON Power, and Energy Development Corporation continue to provide large scale operating expertise.
At the same time, Fervo Energy, Eavor Technologies, Vulcan Energy Resources, Sage Geosystems, GreenFire Energy, Quaise Energy, and other innovators are working to redefine where and how geothermal energy can be produced.
The next decade will be shaped by drilling performance, project finance, reservoir engineering, geothermal lithium extraction, district heating, data center demand, and supportive public policy. Companies that successfully combine technical innovation with disciplined project execution will be best positioned to lead the next phase of global geothermal growth.
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