The global geothermal energy systems market was valued at USD 6.52 billion in 2025. This market is expected to reach USD 14.82 billion by 2036 from USD 7.14 billion in 2026, growing at a CAGR of 7.6% from 2026 to 2036.

• In terms of revenue, the global geothermal energy systems market is projected to reach USD 14.82 billion by 2036.
• The market is expected to grow at a CAGR of 7.6% from 2026 to 2036.
• Asia-Pacific is expected to dominate the global geothermal energy systems market with the largest market share in 2026, driven by Indonesia and the Philippines operating among the world's largest geothermal power fleets, Japan's active geothermal development program supported by policy reform, and the region collectively representing approximately 15% of global EGS technical potential according to the IEA, led by Indonesia and the Philippines.
• Asia-Pacific is also expected to witness the fastest growth during the forecast period, driven by IEA projections in its Renewables 2025 report that annual geothermal capacity additions are expected to reach a historic high in 2030, triple the 2024 increase, with Indonesia, Japan, and the Philippines among the key growth markets alongside the United States, Turkey, and Kenya.
• By system type, the power generation systems segment is expected to hold the largest share of the overall geothermal energy systems market in 2026, as geothermal power plants represent the highest capital value component of the market and the primary commercial product category across the leading geothermal markets in the United States, Indonesia, Philippines, Kenya, and Italy.
• By system type, the geothermal heat pumps segment is expected to witness the fastest growth during the forecast period, driven by the expanding application of shallow ground-source heat pump systems for residential and commercial building heating and cooling across Europe, North America, and Asia, where heating decarbonization policy is accelerating adoption independently of high-temperature geothermal resource availability.
• By technology, the hydrothermal systems segment is expected to hold the largest share of the overall geothermal energy systems market in 2026, as conventional hydrothermal resources in high-enthalpy geothermal regions represent the majority of currently installed global geothermal power capacity of 15.4 GW reported by IRENA at end-2024.
• By technology, the enhanced geothermal systems segment is expected to witness the fastest growth during the forecast period, as advancing drilling technology and growing government and private investment in EGS demonstration and commercial projects is unlocking geothermal resources in countries and regions previously unable to access conventional hydrothermal energy.
• By application, the power generation segment is expected to hold the largest share of the overall geothermal energy systems market in 2026, reflecting the dominant share of geothermal power plant capital equipment and engineering services in total market revenue.
• By end user, the utilities and power companies segment is expected to hold the largest share of the overall geothermal energy systems market in 2026, as electric utilities and independent power producers are the primary developers and operators of geothermal power plants and district heating systems globally.

Geothermal energy systems capture the heat stored in the Earth's crust to produce electricity, provide heating and cooling, and supply heat for industrial processes. These resources range from shallow, near-surface temperatures accessible through ground-source heat pumps at depths of just a few meters to a few hundred meters. They also include intermediate hydrothermal reservoirs at depths of 1 to 3 kilometers, where hot water or steam can be extracted for use in flash steam or binary cycle power plants. Additionally, there are deep, high-temperature resources at depths of 5 to 10 kilometers that next-generation enhanced geothermal systems aim to reach. The IEA's report, The Future of Geothermal Energy (2024), states that the global technical potential for enhanced geothermal system (EGS) electricity generation from resources within 8 kilometers of depth is more than 600 terawatts. This potential is almost 600 times greater than that of conventional hydrothermal geothermal and surpasses all renewable electricity sources except solar PV. The United States has the world's largest EGS technical potential at over 70 terawatts, which is about one-eighth of the global total, followed by China with approximately 50 terawatts.

The commercial geothermal energy market is built around five main system types. Power generation systems change geothermal steam or hot water into electricity using dry steam, flash steam, or binary cycle power plant setups. Installed capacities often range from a few megawatts to over 100 megawatts per plant. Direct use systems apply geothermal heat directly for space heating, greenhouse cultivation, aquaculture, industrial drying, and wellness applications without converting it into electricity. District heating systems distribute geothermal hot water through insulated pipelines to serve groups of buildings in urban or rural areas. Geothermal heat pumps rely on the stable shallow ground temperature as a thermal source for efficient heating and cooling of buildings. Enhanced geothermal systems create or improve permeability in hot, dry rock formations through hydraulic stimulation, allowing heat extraction in areas without natural hydrothermal fluid circulation.

The competitive landscape for geothermal energy includes integrated developers and operators like Ormat Technologies and Calpine Corporation. It also involves large energy companies with geothermal divisions such as Enel Green Power and Chevron. There are major engineering and equipment manufacturers like Mitsubishi Heavy Industries, Toshiba, Siemens Energy, and General Electric. Oilfield services companies, such as Baker Hughes, Halliburton, and SLB, bring their drilling expertise to geothermal projects. Nationally significant geothermal operators include KenGen in Kenya, Star Energy Geothermal in Indonesia, and Pertamina Geothermal Energy. According to the IEA's 2024 geothermal report, geothermal energy currently meets over 90% of heating demand in Iceland and makes up a significant portion of electricity supply in El Salvador, New Zealand, Kenya, and the Philippines. This underscores the commercial success of geothermal in countries with high resource quality and highlights the geographic challenges that next-generation technologies aim to address.

Enhanced Geothermal Systems Unlocking Vast Previously Inaccessible Resources

The development of enhanced geothermal systems, using drilling and reservoir stimulation technologies adapted from the oil and gas industry, is the most transformative trend in the geothermal energy market. It has the potential to turn geothermal energy from a location-specific niche into a globally available source of clean baseload energy. Conventional hydrothermal power development is limited to regions with naturally occurring hot water or steam reservoirs near the surface. This restricts commercial deployment to countries along tectonic boundaries or volcanic zones. EGS technology gets around this limitation by drilling deep wells into hot dry rock formations that exist in nearly all geologies at the right depth. It hydraulically stimulates the rock to create permeable fracture networks and circulates water through these networks to extract heat.

According to the IEA's The Future of Geothermal Energy (2024), EGS has the potential to meet global electricity and heat demand many times over. Just 1% of Africa's EGS potential could fulfill the continent's entire projected electricity demand for 2050. The IEA estimates that with policy support and lower technology costs, EGS expenses could drop by 80% by 2035, reaching around USD 50 per megawatt-hour. This would make geothermal one of the cheapest sources of dispatchable low-emissions electricity.

The oil and gas industry's involvement in EGS development is a key factor in this trend. The IEA's 2024 report stated that up to 80% of the investment needed for a geothermal project comes from skills and capacity common in oil and gas. These include subsurface characterization, well drilling and completion, fluid flow management, and large-scale project management. Companies like Baker Hughes, Halliburton, and SLB are actively creating geothermal-specific service offerings. The increased participation of oil and gas majors in geothermal exploration is providing capital, technical expertise, and supply chain infrastructure that the pure-play geothermal industry cannot access on its own.

IEA Projections for Historic Geothermal Capacity Growth by 2030

Driver: Geothermal Energy's Baseload Dispatchability Advantage in Variable Renewable Energy Grids 

The main driver of the geothermal energy systems market is the technology's unique feature as a baseload, dispatchable renewable energy source. It can deliver a steady power output at high capacity factors, no matter the weather or time of day. According to the IEA's The Future of Geothermal Energy (2024), geothermal plants operate at capacity factors around 80%. This is much higher than solar PV, which operates at about 15-25%, and onshore wind, at 25-40%. As a result, geothermal acts as a dependable resource that helps balance the grid alongside variable solar and wind output.

As the share of variable renewable energy in power grids increases globally to meet decarbonization goals, the importance of dispatchable clean energy sources rises. This trend creates a growing demand for geothermal power. The IEA's Renewables 2025 report predicts that global renewable capacity will double between now and 2030, with solar and wind making up most of the additions. This rise in variable renewables will boost the need for flexible and baseload clean energy options to keep the grid stable. Geothermal's capability to provide baseload clean power in areas with available resources makes it an increasingly valuable asset as energy systems work toward decarbonization.

Opportunity: Industrial Heat Decarbonization Applications 

The decarbonization of industrial process heat offers a valuable opportunity for geothermal energy systems in the medium-temperature range of 80 to 200 degrees Celsius. Industries like food and beverage processing, paper and pulp manufacturing, chemical production, and agricultural drying need large amounts of thermal energy at temperatures that medium-enthalpy geothermal resources can provide directly. This approach keeps the thermodynamic value of the geothermal resource intact and avoids efficiency losses associated with generating electricity and using electric heating.

According to the IEA's The Future of Geothermal Energy (2024), using geothermal heat directly for industrial applications is gaining attention. Industrial companies face rising carbon prices and pressure to cut Scope 1 emissions from burning fossil fuels for heat. Countries like Iceland already supply geothermal heat to fish processing, aluminum smelting, and data centers. New Zealand also uses geothermal heat in processing forestry products. These examples show how large-scale geothermal industrial heat supply can work. Other countries with moderate-temperature geothermal resources are looking to follow this model.

Why Do Power Generation Systems Lead the Market?

In 2026, the power generation systems segment is expected to hold the largest share of the geothermal energy systems market. Geothermal power plants are the most expensive installations in the geothermal sector. Utility-scale projects need an investment of USD 3 million to USD 8 million for each installed megawatt in conventional hydrothermal plants, and significantly more for next-generation EGS installations. The global installed geothermal power capacity of 15.4 GW reported by IRENA at the end of 2024 reflects decades of investment in power plant infrastructure across the United States, Indonesia, Philippines, Kenya, Mexico, Italy, Iceland, and New Zealand. Each operational power plant generates ongoing revenue for equipment suppliers and service providers through operations and maintenance contracts, spare parts purchases, and periodic upgrades. The main markets for geothermal power generation systems are in countries with the best hydrothermal resources. IRENA data shows that geothermal energy covers a large share of national electricity demand, including over 90% of heating in Iceland and significant contributions to grid electricity in Kenya and the Philippines.

However, the geothermal heat pumps segment is expected to grow the fastest during the forecast period. Ground-source heat pump systems use the steady temperature of shallow ground or groundwater as a thermal reservoir for heating and cooling buildings. They operate independently of high-temperature geothermal resources, making them available in almost any region. The European Union's heat pump policy framework, including strong support from the REPowerEU plan for heat pump deployment to reduce dependence on natural gas for building heating, is driving rapid growth in ground-source heat pump installations across Germany, France, the Netherlands, and Sweden. The high energy efficiency, recognized by IRENA as providing three to five units of heating energy for each unit of electrical energy used, combined with compatibility with low-carbon electricity from renewable sources, makes geothermal heat pumps one of the most effective technologies for decarbonizing buildings.

Why Do Hydrothermal Systems Lead the Technology Market?

Why Does Drilling Equipment Lead the Component Market?

How Does Large-scale Utility-scale Lead the Market?

In 2026, the large-scale utility-scale segment is expected to have the largest share of the geothermal energy systems market by deployment mode. Utility-scale geothermal power plants with a capacity of 10 megawatts and above are the most common form of commercial geothermal energy used worldwide. They account for the majority of the 15.4 GW of installed geothermal power capacity reported by IRENA at the end of 2024. Utility-scale projects achieve cost savings in drilling, plant construction, and grid connection. This makes them the most cost-effective option for high-enthalpy hydrothermal resources where fluid temperature and flow rate are adequate for large installations. Major geothermal companies, including Ormat Technologies, Enel Green Power, Calpine, and Pertamina Geothermal Energy, build and operate utility-scale plants typically ranging from 30 to 250 megawatts. The largest geothermal complexes in the United States exceed 700 megawatts in total installed capacity.

However, the small-scale and distributed systems segment is expected to grow the fastest during the forecast period. The rise of ground-source heat pump installations in homes and commercial buildings, the development of small binary cycle power plants for distributed power supply in remote communities, and increasing interest in distributed direct-use geothermal heating systems for industrial and agricultural uses are all contributing to growth in the small-scale segment. The recognized maturity of geothermal heat pump technology for building applications allows for broad deployment of distributed geothermal systems across various locations. This is possible without the high-temperature reservoir requirements that utility-scale power plants have, making small-scale geothermal the most accessible segment of the market.

Why Does Power Generation Lead the Application Market?

Why Do Utilities and Power Companies Lead the End User Market?

In 2026, the utilities and power companies segment is expected to hold the largest share of the geothermal energy systems market. Electric utilities and independent power producers are the main developers, owners, and operators of geothermal power plants worldwide. They serve as the primary source for purchasing the high-cost equipment, drilling services, and long-term operations and maintenance contracts that make up most of the geothermal market revenue. National utilities like KenGen in Kenya operate the largest geothermal power fleet in Africa, with about 863 megawatts of installed capacity at the Olkaria geothermal field. Other major operators include state-owned enterprises like Pertamina Geothermal Energy in Indonesia and PNOC Renewables Corporation in the Philippines. Private utilities and IPPs, such as Ormat Technologies, Calpine Corporation, and Contact Energy in New Zealand, develop and manage geothermal power assets through long-term power purchase agreements with grid operators.

However, the commercial sector segment is expected to grow the fastest during the forecast period. Commercial buildings, including offices, hotels, retail centers, and institutions, are becoming an important end-user segment for both geothermal heat pump systems and direct-use geothermal district heating connections. The increasing sustainability commitments of large commercial real estate owners, along with stricter energy efficiency regulations for commercial buildings in Europe and North America, are driving the purchase of ground-source heat pump systems as a key technology for heating and cooling. The high efficiency of geothermal heat pumps, recognized by IRENA, delivers three to five units of heating energy for each unit of electricity used. This provides a strong economic and environmental argument for the adoption of geothermal systems in markets where electricity grids are increasingly powered by low-carbon energy.

How is Asia-Pacific Maintaining Market Leadership?

In 2026, Asia-Pacific is expected to have the largest share of the global geothermal energy systems market. This region includes two of the biggest geothermal power producers by installed capacity, Indonesia and the Philippines. It also features Japan's growing geothermal development program and China's increasing use of geothermal heat. Indonesia has some of the most productive high-enthalpy hydrothermal resources along the Pacific Ring of Fire. Pertamina Geothermal Energy and Star Energy Geothermal operate major power complexes there. The Philippines also enjoys excellent hydrothermal resources, with geothermal energy accounting for about 10% of the country's electricity generation.

According to IRENA's Renewable Capacity Statistics 2025, New Zealand led geothermal capacity additions in 2024, followed by Indonesia, Turkey, and the United States. IRENA's data from April 2026 confirmed that geothermal added 0.3 GW in 2025, with the Philippines and Indonesia each contributing 0.1 GW of new capacity. The IEA's report, The Future of Geothermal Energy (2024), states that ASEAN countries together represent about 15% of global EGS technical potential, with Indonesia and the Philippines at the forefront of the regional assessment. The IEA's Renewables 2025 report identified Indonesia and the Philippines as two of the six countries expected to drive the planned tripling of annual geothermal additions by 2030, along with the United States, Japan, Turkey, and Kenya.

How is North America Contributing to Global Market Growth?

Some of the key companies operating in the global geothermal energy systems market are Ormat Technologies, Inc., Calpine Corporation, Enel Green Power S.p.A., Chevron Corporation, Mitsubishi Heavy Industries Ltd., Siemens Energy AG, Toshiba Energy Systems & Solutions Corporation, General Electric Company, Baker Hughes Company, Halliburton Company, SLB (Schlumberger), KenGen (Kenya Electricity Generating Company), Contact Energy Ltd., Star Energy Geothermal, and Pertamina Geothermal Energy.

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