Company lists · Data refreshed September 2026

Top 25 Geothermal system companies worldwide

Name: Geothermal system companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 8,141 companies tracked

RevenueBase identified 8,141 geothermal system companies worldwide as of September 2026 and tracks 65,770 professional contacts across them, including 18,350 with verified work emails. The United States is the largest market and Madrid the largest hub.

This list covers geothermal system 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 system 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

8,141Companies

65,770Contacts tracked

18,350Verified emails

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The 25 largest geothermal system companies worldwide

Ranked by team size

Top 25 of 8,141 geothermal system companies worldwide, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to geothermal system companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Calpine	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	1,001-5,000	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, 2026
2	Energy Development Corporation	Indirect evidence	Pasig City, PhilippinesHQ checked Sep 20, 2026	1,001-5,000	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, 2026
3	Ormat Technologies, INC	Indirect evidence	Reno, NV, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,281 contacts →
	Indirect evidence “With over five decades of experience, Ormat Technologies, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
4	PT Pertamina Geothermal Energy TBK	Partial evidence	Gambir, IndonesiaHQ checked Sep 20, 2026	201-500	1,242 contacts →
	Partial evidence “Indonesia Geothermal Company” Source: RevenueBase Database · checked Sep 20, 2026
5	Danfoss Climate Solutions	Indirect evidence	Nordborg, DenmarkHQ checked Sep 20, 2026	10001+	1,128 contacts →
	Indirect evidence “At Danfoss Climate Solutions, we engineer energy-efficient heating and cooling solutions to help the world get more out of less.” Source: RevenueBase Database · checked Sep 20, 2026
6	BAXI	Indirect evidence	Warwick, United KingdomHQ checked Sep 20, 2026	1,001-5,000	850 contacts →
	Indirect 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, 2026
7	Feenstra	Indirect evidence	Lelystad, NetherlandsHQ checked Sep 20, 2026	1,001-5,000	781 contacts →
	Indirect evidence “Sinds het ontstaan in 1947 is Feenstra marktleider in installatietechniek met een nationale dekking.” Source: RevenueBase Database · checked Sep 20, 2026
8	PT GEO Dipa Energi Persero	Partial evidence	Jakarta Selatan, IndonesiaHQ checked Sep 20, 2026	201-500	501 contacts →
	Partial evidence “PT Geo Dipa Energi (Persero) is a State-Owned Company specializing in Geothermal Energy” Source: RevenueBase Database · checked Sep 20, 2026
9	Korra Energi	Indirect evidence	Cairo, EgyptHQ checked Sep 20, 2026	1,001-5,000	469 contacts →
	Indirect evidence “Korra Energi is a proud Egyptian leader in energy efficiency and construction services, backed by over 25 years of expertise and a vision of "Growth and Prosperity"(إعمار الأرض).” Source: RevenueBase Database · checked Sep 20, 2026
10	Groupe Coriance	Indirect evidence	Noisy-le-grand, FranceHQ checked Sep 20, 2026	501-1,000	452 contacts →
	Indirect evidence “Pour une énergie propre et mieux utilisée Notre mission : fournir des solutions énergétiques performantes et économiques, tout en minimisant l'impact environnemental.” Source: RevenueBase Database · checked Sep 20, 2026
11	Constructora Y Perforadora Latina, S.A. DE C.V	Indirect evidence	MexicoHQ checked Sep 20, 2026	201-500	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, 2026
12	Ferroli Group	Indirect evidence	San Bonifacio, ItalyHQ checked Sep 20, 2026	1,001-5,000	418 contacts →
	Indirect evidence “Comfort, designed around you – Since 1955, Ferroli has been a trusted name in HVAC, delivering innovative solutions for heating, cooling and hot water that combine comfort, energy…” Source: RevenueBase Database · checked Sep 20, 2026
13	Anvolia	Indirect evidence	La Chapelle-sur-erdre, FranceHQ checked Sep 20, 2026	501-1,000	295 contacts →
	Indirect evidence “Créée en 1991, Anvolia, entreprise familiale indépendante de génie climatique, conçoit, installe et maintient des solutions de chauffage, climatisation, traitement de l'air et…” Source: RevenueBase Database · checked Sep 20, 2026
14	Rinnai Australia	Indirect evidence	Braeside, AustraliaHQ checked Sep 20, 2026	201-500	294 contacts →
	Indirect evidence “Following Rinnai's international origins dating back more than 100 years, Rinnai Australia was established 50 years ago and since then has been providing Australians with the best…” Source: RevenueBase Database · checked Sep 20, 2026
15	Remica	Indirect evidence	Madrid, SpainHQ checked Sep 20, 2026	501-1,000	279 contacts →
	Indirect evidence “Grupo Remica se crea en 1984 como empresa de instalación y mantenimiento de sistemas de calefacción, climatización y ACS.” Source: RevenueBase Database · checked Sep 20, 2026
16	Supreme Energy	Partial evidence	Jakarta Selatan, IndonesiaHQ checked Sep 20, 2026	201-500	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, 2026
17	Arclima Engenharia	Indirect evidence	Cabo De Santo Agostinho, BrazilHQ checked Sep 20, 2026	201-500	265 contacts →
	Indirect evidence “A Arclima Engenharia é uma empresa brasileira especializada em Climatização, Refrigeração e Eficiência Energética (HVAC), com atuação em todo o território nacional.” Source: RevenueBase Database · checked Sep 20, 2026
18	DH	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 20, 2026	n/a	263 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
19	Thermaprime Drilling Corporation	Partial evidence	Pasig, PhilippinesHQ checked Sep 20, 2026	501-1,000	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, 2026
20	Grupo IPS	Indirect evidence	Conroe, TX, United StatesHQ checked Sep 20, 2026	51-200	245 contacts →
	Indirect evidence “IPS is an integrated oilfield service company with over 20 years in the business.” Source: RevenueBase Database · checked Sep 20, 2026
21	Exact SUN India Pvt. LTD	Indirect evidence	Khopoli, IndiaHQ checked Sep 20, 2026	51-200	225 contacts →
	Indirect evidence “Exact Sun India specializes in delivering comprehensive mechanical, structural, and electrical design services, along with full-service installation solutions for both industrial…” Source: RevenueBase Database · checked Sep 20, 2026
22	Waterfurnace International	Indirect evidence	Fort Wayne, IN, United StatesHQ checked Sep 20, 2026	201-500	224 contacts →
	Indirect evidence “WaterFurnace International, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
23	Tolin Mechanical Systems	Indirect evidence	Denver, CO, United StatesHQ checked Sep 20, 2026	201-500	220 contacts →
	Indirect evidence “Tolin Mechanical is a Leading Energy & Commercial HVAC Services Company.” Source: RevenueBase Database · checked Sep 20, 2026
24	Fervo Energy	Partial evidence	Houston, CA, United StatesHQ checked Sep 20, 2026	51-200	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, 2026
25	Saman Groep	Indirect evidence	Zierikzee, NetherlandsHQ checked Sep 20, 2026	201-500	211 contacts →
	Indirect evidence “De energietransitie is één van de grootste maatschappelijke opgaven, maar wij begrijpen dat jouw wooncomfort net zo belangrijk is.” Source: RevenueBase Database · checked Sep 20, 2026

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 system 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 system companies.
Partial evidence: Its own public description names part of geothermal system companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geothermal system 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 8,141 geothermal system companies worldwide

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Geothermal system companies worldwide at a glance

As of Sep 20, 2026

27.9%Verified-email coverage

8.1Average contacts per company

1-10Median size (employees)

0.5%Largest-city concentration · Madrid

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

4,224

11-50

2,893

51-200

672

201-500

108

501-1,000

1,001-5,000

5,001-10,000

10001+

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 system 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 system companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “geothermal system 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 system 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 system 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, 18,350 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 system companies by location

27 lists · largest first

Every Geothermal system companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

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 system 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 system companies are there worldwide?

RevenueBase identified 8,141 geothermal system 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 system companies?

The United States leads with 1,034 companies, followed by France (835) and Germany (675). Every geothermal system companies list by country and city is linked on this page.

Which city has the most geothermal system companies?

Madrid leads with 44 headquartered companies, followed by London (43) and Berlin (32).

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 18,350 verified decision-maker contacts tracked across these 8,141 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.