Authors:
Ankit Gupta, Vishal Saini
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Geothermal Energy Market Size & Share 2026-2035
Report ID: GMI1244
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Published Date: November 2026
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Geothermal Energy Market Size
The geothermal energy market was valued at USD 66.90 billion in 2025, rising to USD 67.85 billion in 2026, and is projected to expand at a 5.5% CAGR (2026-2035) to reach USD 109.61 billion by 2035. The market encompasses geothermal exploration, drilling, plant construction, electricity generation, direct-use applications, and long-life operations and maintenance across hydrothermal and enhanced geothermal systems.
Geothermal Energy Market Key Takeaways
Market Leader: Ormat Technologies led with over 9.2% market share in 2025.
Leading Players: Top 5 players in this market include Ormat Technologies, Enel Green Power, Calpine Corporation, Contact Energy, Energy Development Corporation (EDC), which collectively held a market share of 31.6% in 2025.
The market is evolving from a predominantly site-specific hydrothermal power business toward a broader platform for firm renewable electricity and heat. Demand is supported by utility procurement for dispatchable low-emission generation, corporate interest in reliable clean power, and the wider use of binary-cycle systems that can monetize lower-temperature resources. Long development timelines remain material, however, making financing continuity, drilling performance, and permitting discipline central to commissioning schedules.
GMI Analyst View
Based on our engagement with industry participants and historical revenue tracking across the market's global installed base, the geothermal energy market generated USD 61.50 billion in revenue in 2022, establishing the demand baseline from which the current growth cycle has developed. We view the transition from this baseline as dependent on developers converting improved drilling capability and offtake interest into repeatable project execution beyond established hydrothermal fields.
Geothermal Energy Market Trends, Growth Drivers & GMI Forecast Outlook
Geothermal development is gaining strategic relevance where power systems require clean generation that can operate independently of weather conditions. Investment appetite is widening the opportunity set for conventional projects and enhanced geothermal systems, but the pace of revenue realization remains tied to subsurface risk management, financing structures, and permitting outcomes.
Key Drivers
Evidence anchors use cited external data; demand implications and forecast conditions represent GMI analysis.
Capital is increasingly directed toward projects whose drilling methods, reservoir characterization, and commercial structures can reduce perceived subsurface risk. This matters because geothermal assets create revenue streams over long operating lives, allowing successful early developments to support further financing, service activity, and equipment demand. Under a low-cost development scenario, the International Energy Agency indicates that cumulative geothermal investment could reach USD 1 trillion by 2035 [4]International Energy Agency. "The Future of Geothermal Energy." [iea.org](https://www.iea.org/reports/the-future-of-geothermal-energy), underscoring the scale of capital that could be mobilized if project economics improve.
Installed capacity also strengthens the market's recurring revenue base. Operating plants require reservoir management, well servicing, maintenance, and periodic equipment upgrades in addition to electricity sales. The resulting installed-base economics provide resilience when new-build activity is uneven, while project pipelines in resource-rich markets create a route for capacity additions to broaden the geographic distribution of revenue.
Binary-cycle and enhanced geothermal technologies are particularly consequential because they alter the relationship between geology and commercial opportunity. ORC and Kalina configurations can use moderate-temperature resources that do not support conventional flash systems, while advanced drilling and reservoir-development approaches could make deeper resources more accessible. These technologies shift competition toward developers and suppliers able to combine engineering capability with credible risk allocation.
Key Restraints
Evidence anchors use cited external data; demand implications and forecast conditions represent GMI analysis.
Geological uncertainty is commercially significant because it is encountered before a project has established a revenue stream. Deep drilling campaigns can encounter unfavorable rock conditions, unexpected fluid chemistry, or reservoir-performance constraints that alter a project's capital needs and financing terms. In markets with limited risk-sharing capacity, this can narrow participation to state-backed entities, established utilities, and developers with specialized technical balance sheets.
The concentration of expenditure in wells makes drilling productivity a decisive determinant of project economics. Improvements in directional drilling, formation evaluation, cementing, and reservoir monitoring can reduce uncertainty, but their commercial impact depends on whether they transfer effectively from pilot projects to repeatable field development. Conventional projects in frontier markets remain especially exposed to cost escalation where local drilling capacity and long-tenor finance are limited.
Permitting frameworks can compound these risks when land access, resource rights, environmental review, and tariff design are handled through separate and poorly aligned processes. Developers require clarity not only on construction authorization, but also on the conditions governing resource stewardship, grid connection, and long-term revenue. Countries that align these elements are better placed to convert resource potential into bankable projects.
GMI Analyst View
We see a widening divergence between markets that offer investable geothermal development conditions and those that possess resources without an effective route to commercialization. Conventional hydrothermal assets should continue to provide the market's operating foundation, while binary-cycle and enhanced geothermal projects will determine how broadly new demand can be served. The critical differentiator is likely to be the durability of permitting, offtake, and risk-sharing frameworks rather than technology availability alone.
Geothermal Energy Market Segment Analysis
By Technology Type
The geothermal energy market is led by Single Flash Steam, which generated USD 24.08 billion in revenue in 2025 and is projected to hold a 38.3% market share by 2035. Its position reflects the suitability of single-flash designs for high-enthalpy, liquid-dominated reservoirs in established geothermal markets. The technology remains commercially attractive where reservoir conditions support high flow rates and developers prioritize proven plant configurations with established operating practices.
Binary Cycle (ORC/Kalina) accounted for 26.9% of market revenue in 2025 and is forecast to generate USD 38.36 billion by 2035. The segment's relevance extends beyond its revenue contribution: ORC and Kalina systems expand project eligibility to moderate-temperature resources and can be deployed as bottoming-cycle additions at existing facilities. This flexibility gives binary-cycle suppliers and developers a stronger position in markets without readily accessible high-temperature reservoirs.
Dry Steam held a 17.4% market share in 2025 and is expected to register a 0.1% CAGR (2026-2035). The segment is concentrated in a limited number of mature steam-dominated fields, where established infrastructure and long-term operating experience preserve revenue stability. Its constrained growth outlook reflects the scarcity of comparable undeveloped reservoirs rather than a loss of value from existing assets.
Double Flash Steam is projected to hold a 15.1% market share by 2035 and expand at a 3.9% CAGR (2026-2035). By recovering additional energy from separated brine, double-flash designs improve resource utilization where reservoir enthalpy supports staged flashing. Their adoption is therefore tied to optimization programs at productive hydrothermal sites, particularly where operators can enhance output without assuming the exploration risk associated with a wholly new field.
Triple-flash steam and back-pressure systems retain narrower roles in locations where reservoir behavior, operating requirements, and plant economics favor specialized configurations. Their relevance is less a function of broad deployment than of their ability to address site-specific resource and grid conditions.
GMI Analyst View
We believe technology selection is becoming a commercial decision as much as a reservoir decision. Single-flash systems remain advantaged in high-quality hydrothermal fields, but binary-cycle platforms are broadening the investable resource base and supporting retrofit opportunities. The segment mix will increasingly reflect which technologies can be financed, permitted, and contracted under local power-market rules.
Geothermal Energy Market Regional Analysis
North America Geothermal Energy Market Analysis
The geothermal energy market in North America generated USD 18.00 billion in revenue in 2025 and is projected to reach USD 28.00 billion by 2035. Regional demand is anchored by the United States' established hydrothermal fleet, while Canadian policy development and technology-led exploration create a pathway for more diversified growth. Mexico adds mature hydrothermal production and incremental opportunities around established fields.
United States
The United States generated USD 15.90 billion in geothermal energy revenue in 2025 and is projected to reach USD 20.05 billion by 2035. Federal incentives, state procurement policies, and growing interest in firm clean electricity support the development case for conventional and next-generation projects. U.S. geothermal plants produced about 16 billion kilowatthours of electricity in 2025, accounting for approximately 0.4% of utility-scale generation [5]U.S. Energy Information Administration. "Use of Geothermal Energy." [eia.gov](https://www.eia.gov/energyexplained/geothermal/use-of-geothermal-energy.php), illustrating both the sector's established operating role and its room for expansion.
Canada
Canada generated USD 650.0 million in revenue in 2025 and is forecast to expand at a 25.0% CAGR (2026-2035). Development interest is supported by resource potential in western sedimentary and volcanic settings, alongside policy attention in provinces seeking to repurpose drilling expertise and infrastructure. ORC systems are important to the country's opportunity because they can commercialize lower-temperature resources that are less suited to conventional flash generation.
Mexico
Mexico held an 8.1% share of North American geothermal revenue in 2025 and is projected to generate USD 1.89 billion by 2035. The country's market remains centered on established volcanic-belt resources and operating experience at major fields, creating a foundation for plant upgrades, reservoir management, and selective capacity additions. Progress will depend on the investment and concession environment available to support new development beyond mature assets.
Europe Geothermal Energy Market Analysis
Europe is projected to generate USD 7.00 billion in geothermal energy market revenue by 2035, compared with a 6.7% share of global revenue in 2025. The region combines mature power-producing fields with an expanding pipeline for deep geothermal heat and binary-cycle applications. This mix positions technology providers, municipal utilities, and project developers to address distinct electricity and thermal demand pools.
Iceland
Iceland generated USD 1.80 billion in geothermal energy revenue in 2025 and is projected to hold a 35.7% share of European market revenue by 2035. Its high resource quality and deeply integrated geothermal infrastructure support power generation and district heating simultaneously. Future growth is expected to center on field extensions, operational optimization, and deeper-resource exploration rather than broad greenfield expansion.
Italy
Italy accounted for 33.3% of European geothermal market revenue in 2025 and is projected to generate USD 2.10 billion by 2035. The country's installed base is distinguished by long-operating geothermal fields and Enel Green Power's integrated operating position. Revenue expansion is likely to rely more on repowering, equipment replacement, and reservoir stewardship than on large-scale new surface development.
Germany
Germany generated USD 136.9 million in geothermal revenue in 2025 and is forecast to expand at a 17.7% CAGR (2026-2035). Its opportunity is shaped by binary-cycle power, deep geothermal heating, and municipal or industrial heat contracts rather than high-enthalpy hydrothermal generation. The market's momentum depends on project developers demonstrating that drilling, heat-network integration, and local permitting can be coordinated at commercial scale.
Asia Pacific Geothermal Energy Market Analysis
Asia Pacific generated USD 28.00 billion in geothermal energy market revenue in 2025 and is projected to hold a 40.1% global market share by 2035. The region's leadership reflects the concentration of productive volcanic resources, established utility procurement, and experienced domestic developers. Its installed base also creates sustained demand for plant maintenance, reservoir management, and expansion projects.
Indonesia
Indonesia generated USD 9.85 billion in geothermal revenue in 2025 and is projected to hold a 36.5% share of Asia Pacific revenue by 2035. The market benefits from an extensive volcanic resource base and state-backed offtake structures that underpin multi-field development. Its ability to sustain commissioning momentum will depend on controlling drilling costs, coordinating approvals, and retaining financing support through the exploration and construction phases.
Philippines
The Philippines held a 26.8% share of Asia Pacific geothermal revenue in 2025 and is projected to generate USD 11.48 billion by 2035. A mature resource base and a substantial operating fleet provide the country with a firm-renewables advantage within its power system. Continued progress depends on maintaining investor clarity under the energy-contracting framework and extending development beyond the highest-quality established fields.
New Zealand
New Zealand generated USD 7.00 billion in geothermal energy market revenue in 2025 and is projected to expand at a 4.1% CAGR (2026-2035). The market is supported by a productive hydrothermal resource base and experienced integrated power generators in the Taupo Volcanic Zone. Its moderate growth profile reflects a mature development environment in which optimization, replacements, and incremental additions are likely to carry more weight than extensive greenfield expansion.
Japan
Japan held an 8.9% share of Asia Pacific geothermal revenue in 2025 and is projected to generate USD 4.00 billion by 2035. The country's resource potential is considerable, but commercial development must navigate land-use restrictions, local stakeholder concerns, and high project costs. Policy reforms that improve access and clarify development conditions could strengthen the role of binary-cycle and carefully sited hydrothermal projects.
Latin America Geothermal Energy Market Analysis
Latin America held an 11.1% share of global geothermal market revenue in 2025 and is projected to generate USD 10.61 billion by 2035. The market is concentrated along the Pacific volcanic arc, where established generation assets coexist with underdeveloped prospects. National utility strategies, development finance, and the economics of incremental field expansion will shape the region's growth path.
Costa Rica
Costa Rica generated USD 1.08 billion in geothermal revenue in 2025 and is forecast to expand at a 21.0% CAGR (2026-2035). The country's development case is reinforced by a longstanding clean-electricity strategy, capable public utility participation, and productive volcanic resources. Further progress will rely on project execution at field extensions and the ability to align geothermal investment with broader system-planning priorities.
El Salvador
El Salvador generated USD 2.20 billion in geothermal revenue in 2025 and is projected to hold a 26.4% share of Latin American geothermal market revenue by 2035. Geothermal power is an important source of domestic firm generation, supported by established fields and operating expertise. The market's outlook is tied to repowering and reservoir optimization, as its most accessible resources are already developed.
Guatemala
Guatemala generated USD 240.3 million in geothermal revenue in 2025 and is projected to reach USD 656.9 million by 2035. Existing operations demonstrate commercial potential along the volcanic arc, while additional prospects provide a basis for exploration-led growth. Regulatory clarity and access to technical and financial support will determine whether those prospects advance into an investable pipeline.
Middle East & Africa (MEA) Geothermal Energy Market Analysis
The Middle East & Africa geothermal energy market generated USD 9.00 billion in revenue in 2025 and is projected to expand at a 9.0% CAGR (2026-2035). Growth is shaped by two distinct models: commercially developed hydrothermal assets in Turkey and development-finance-supported projects across the East African Rift. The region's opportunity is substantial, but execution requirements differ sharply by country.
Turkey
Turkey generated USD 3.50 billion in geothermal energy revenue in 2025 and is projected to reach USD 8.99 billion by 2035. Feed-in tariff support, productive western Anatolian reservoirs, and experienced local developers have created one of the most active geothermal markets outside Asia Pacific. The next phase of growth will depend on available resource acreage, equipment availability, and the durability of commercial incentives.
Kenya
Kenya held a 38.9% share of MEA geothermal revenue in 2025 and is projected to generate USD 7.23 billion by 2035. The country's Olkaria complex provides a strong operating platform, while public-sector development and international finance support further capacity expansion. Continued growth depends on wellfield execution, grid integration, and the availability of long-tenor funding appropriate for geothermal asset lives.
Ethiopia
Ethiopia generated USD 27.1 million in geothermal revenue in 2025 and is forecast to expand at a 44.4% CAGR (2026-2035). The high growth rate reflects an early-stage commercial base and the prospect of advancing Rift Valley resources through blended-finance structures and technical partnerships. The market's strategic potential is significant, though its near-term contribution depends on converting exploration programs into operating projects.
GMI Analyst View
We view MEA as the clearest example of how geothermal growth can emerge from different commercial models. Turkey demonstrates the effect of established incentives and capable private development, while East Africa illustrates the importance of public execution and development finance. Asia Pacific should retain structural leadership, but successful project delivery in MEA would make the global market less dependent on traditional resource centers.
Geothermal Energy Market Share & Competitive Landscape
The geothermal energy market share structure is moderately fragmented, with the top five companies, including Ormat Technologies, Enel Green Power, Calpine Corporation, Contact Energy, and Energy Development Corporation (EDC), collectively holding approximately 31.6% of market revenue in 2025. Competition is shaped by access to high-quality resource acreage, drilling and reservoir-management capability, long-term power contracts, and the ability to integrate equipment supply, engineering, and operations. National utilities and regional specialists remain influential because project economics are closely tied to local regulation, grid requirements, and site-specific geology.
Ormat Technologies
Ormat Technologies held a 9.2% share of global geothermal market revenue in 2025. Its competitive position is reinforced by vertical integration across binary-cycle equipment design, plant development, ownership, and operations. This model allows the company to combine technology supply with recurring operating revenues and gives it relevance in both established hydrothermal markets and new projects requiring ORC expertise.
Enel Green Power
Enel Green Power held a 7.8% share of global geothermal market revenue in 2025. Its portfolio benefits from long-operating Italian geothermal assets and participation in selected international markets, combining operating experience with a strong position in mature steam and flash fields. The company's competitive challenge is to extend value from established resource bases through repowering, efficiency improvements, and disciplined reservoir management.
Calpine Corporation
Calpine Corporation held a 5.5% share of global geothermal market revenue in 2025. Its geothermal position is centered on the Geysers complex in California, where extensive steam-field infrastructure and long-term power-market participation support operating continuity. The company's scale at a major single resource area highlights the continuing value of proven fields with established transmission access and contractual revenue visibility.
Contact Energy
Contact Energy is a leading geothermal operator in New Zealand, with generation assets in the Taupo Volcanic Zone. Its portfolio integrates geothermal generation with broader electricity-market operations, allowing the company to use firm renewable output as a strategic complement to hydro and gas assets. Development within existing fields remains important to preserving its regional operating position.
Energy Development Corporation (EDC)
Energy Development Corporation is a leading geothermal producer in the Philippines, operating across key resource areas in Leyte, Bicol, the Visayas, and Mindanao. Its competitive strength lies in established field operations, domestic development knowledge, and the ability to participate in resource expansion under the Philippine energy-contracting framework. International partnerships could further extend its role beyond its home market.
Other Key Players
Ansaldo Energia, Fuji Electric, GE Vernova, Mitsubishi Heavy Industries, and Toshiba compete across geothermal turbine and generation-equipment supply, where engineering is closely tailored to reservoir conditions and plant configuration. SLB and Halliburton apply drilling, well-services, formation-evaluation, and completion capabilities that are increasingly relevant as developers seek to improve well productivity and manage subsurface risk.
KenGen, Pertamina Geothermal Energy, First Gen, and Star Energy Geothermal illustrate the importance of regional champions with local resource access, policy familiarity, and utility or state-linked commercial relationships. Enertime, Exergy International, Reykjavik Geothermal, and Turboden are positioned around technology development, binary-cycle systems, and international project expertise, particularly where markets require specialized engineering rather than standardized power-generation solutions.
Recent Industry Developments
June 2025 - PT Pertamina Geothermal Energy: Lumut Balai Unit 2 Commissioned in Indonesia
PT Pertamina Geothermal Energy completed commissioning of the Lumut Balai Unit 2 geothermal power plant in South Sumatra in June 2025. The project added 55 MW of geothermal capacity and raised the company's installed geothermal capacity to 727 MW [6]PT Pertamina Geothermal Energy. "Lumut Balai Geothermal Power Plant Unit 2 Is Fully Operational." [pge.pertamina.com](https://www.pge.pertamina.com/en/press-release/lumut-balai-geothermal-power-plant-unit-2-is-fully-operational-pge-increases-installed-capacity-by-55-mw-towards-its-1-gw-target). The commissioning demonstrates continued execution in Indonesia's established geothermal market and supports the country's wider pipeline of utility-scale renewable projects.
July 2025 - KenGen: Cabinet Approves Olkaria VII Geothermal Power Plant in Kenya
Kenya's Cabinet approved KenGen's Olkaria VII geothermal power plant in July 2025. The planned 80.3 MW project is intended to draw on production wells at the Olkaria complex and target commercial operation in 2027, with financing support from the European Investment Bank and the Government of Japan [7]ThinkGeoEnergy. "KenGen Receives Cabinet Approval for Olkaria VII Geothermal Power Plant, Kenya." [thinkgeoenergy.com](https://www.thinkgeoenergy.com/kengen-receives-cabinet-approval-for-olkaria-vii-geothermal-power-plant-kenya). The approval reinforces the role of public planning and international finance in advancing East African geothermal capacity.
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