Company lists · Data refreshed September 2026
Top 25 Geothermal heating companies worldwide
RevenueBase identified 2,900 geothermal heating companies worldwide as of September 2026 and tracks 27,896 professional contacts across them, including 7,936 with verified work emails. The United States is the largest market and Calgary the largest hub.
This list covers geothermal heating companies worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026. Country and city lists for geothermal heating companies follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest geothermal heating companies worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 2,112 contacts → | ||||
Partial evidence “A business unit of Constellation (NASDAQ: CEG), Calpine Corporation is America’s largest generator of electricity from natural gas and geothermal resources with operations in…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,719 contacts → | ||||
Indirect evidence “The Energy Development Corporation (EDC) is a pioneer in generating 100% clean, renewable, and reliable power as an electricity supplier in the Philippines for over 40 years.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,281 contacts → | ||||
Indirect evidence “With over five decades of experience, Ormat Technologies, Inc.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 850 contacts → | ||||
Partial evidence “We're leading the energy transition to zero carbon, by offering complete residential and commercial heating and hot water solutions.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 501 contacts → | ||||
Partial evidence “PT Geo Dipa Energi (Persero) is a State-Owned Company specializing in Geothermal Energy” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 429 contacts → | ||||
Indirect evidence “Constructora y Perforadora LATINA (“LATINA”) Es una empresa privada con mas de 60 años de experiencia en el sector de energía y actualmente es la principal empresa en…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 365 contacts → | ||||
Indirect evidence “Vaillant Group, ısıtma ve havalandırma teknolojisi alanlarında uluslararası pazarlarda lider bir kuruluştur.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 271 contacts → | ||||
Partial evidence “Supreme Energy Group of Companies (SEML/SERD/SERB), a growing Multinational Energy Companies with its core business on renewable energy Geothermal Power Plant.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 247 contacts → | ||||
Partial evidence “Thermaprime Drilling Corporation Geothermal, Oil & Gas Drilling BASIC SERVICES Well Construction Management • Drilling of geothermal wells • Drilling of onshore oil and gas wells…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 224 contacts → | ||||
Indirect evidence “WaterFurnace International, Inc.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 213 contacts → | ||||
Partial evidence “Fervo Energy provides 24/7 carbon-free energy through the development of next-generation geothermal power.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 149 contacts → | ||||
Indirect evidence “Eteck levert duurzame energie in de vorm van koude en warmte.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 145 contacts → | ||||
Indirect evidence “We're hiring!” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 143 contacts → | ||||
Indirect evidence “Founded 1874 in Germany and still family owned Vaillant employ over To which we develop and manufacture our products at 16 sites in 8 Countries, and sell our products to over 80…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 136 contacts → | ||||
Indirect evidence “WIR SORGEN FÜR IHR WOHLBEFINDEN.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 133 contacts → | ||||
Indirect evidence “Aboitiz Power Corporation (AboitizPower, AP) is a leader in the Philippine Electric Power Industry with a portfolio of assets located across the country.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 128 contacts → | ||||
Partial evidence “ABOUT http://iceland-drilling.com/ Iceland Drilling Ltd is a leading high technical company in the field of high temperature geothermal drilling and has many decades of experience…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 124 contacts → | ||||
Indirect evidence “Bilgi birikimini yatırıma ve tasarrufa dönüştürmek için çalışmalarını 1990 yılından bu yana sürdüren Doğan Jeotermal Group ülkemizin sahip olduğu jeotermal enerji kaynaklarını…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 118 contacts → | ||||
Indirect evidence “CTC är en av Europas ledande tillverkare av värmeprodukter.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 118 contacts → | ||||
Strong evidence “Dandelion Energy is the nation’s leading residential geothermal provider, on a mission to make the world’s most efficient heating and cooling technology accessible to everyone.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 115 contacts → | ||||
Indirect evidence “The Ecoforest group of companies was incorporated in Vigo in 1959 by owner and founder José Carlos Alonso Martinez specializing in the energy sector.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 112 contacts → | ||||
Partial evidence “BRÖTJE efficient heating system technology.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 111 contacts → | ||||
Partial evidence “KS Orka Renewables is one of the most ambitious geothermal developers in the world.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 110 contacts → | ||||
Indirect evidence “At ENCON, we take care of people.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 108 contacts → | ||||
Indirect evidence “Brightcore Energy is a leading renewable energy solutions provider serving commercial, institutional, and government clients.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: geothermal heating companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names geothermal heating companies.
- Partial evidence
- Its own public description names part of geothermal heating companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name geothermal heating companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 2,900 geothermal heating companies worldwide
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Geothermal heating companies worldwide at a glance
As of Sep 20, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among geothermal heating companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for geothermal heating companies are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “geothermal heating companies”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names geothermal heating companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among geothermal heating companies, and records with no verified work email.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 7,936 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Geothermal heating companies by location
23 lists · largest firstEvery Geothermal heating companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Geothermal heating companies based in the United States441
- Geothermal heating companies based in France312
- Geothermal heating companies based in Germany262
- Geothermal heating companies based in the United Kingdom231
- Geothermal heating companies based in Poland178
- Geothermal heating companies based in Spain133
- Geothermal heating companies based in the Netherlands126
- Geothermal heating companies based in Brazil118
- Geothermal heating companies based in Italy118
- Geothermal heating companies based in Canada104
- Geothermal heating companies based in Türkiye100
- Geothermal heating companies based in Portugal78
- Geothermal heating companies based in India74
- Geothermal heating companies based in Switzerland72
- Geothermal heating companies based in Belgium69
- Geothermal heating companies based in Finland46
- Geothermal heating companies based in Ireland46
- Geothermal heating companies based in Sweden45
- Geothermal heating companies based in Norway40
- Geothermal heating companies based in New Zealand38
- Geothermal heating companies based in Denmark30
- Geothermal heating companies based in Australia26
- Geothermal heating companies based in Austria26
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names geothermal heating companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many geothermal heating companies are there worldwide?
RevenueBase identified 2,900 geothermal heating companies worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Calpine, headquartered in Houston, tops this list with the largest team on record.
Which country has the most geothermal heating companies?
The United States leads with 441 companies, followed by France (312) and Germany (262). Every geothermal heating companies list by country and city is linked on this page.
Which city has the most geothermal heating companies?
Calgary leads with 17 headquartered companies, followed by London (17) and Houston (16).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 7,936 verified decision-maker contacts tracked across these 2,900 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.