Company lists · Data refreshed November 2026

Top 25 Geothermal contractors worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 21,729 companies tracked

RevenueBase identified 21,729 company matches for geothermal contractors worldwide as of November 2026 and tracks 238,370 professional contacts across them, including 63,192 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for geothermal contractors worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 6, 2026. Country and city lists for geothermal contractors follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Nov 6, 2026 How this list was built

21,729Companies

238,370Contacts tracked

63,192Verified emails

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The 25 largest geothermal contractors worldwide

Ranked by team size

Top 25 of 21,729 company matches for geothermal contractors worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Acco Engineered Systems	Exact match	Pasadena, CA, United StatesHQ recorded Nov 6, 2026	5,001-10,000	2,633 contacts →
	Exact match “Since 1934, owners and builders have selected ACCO Engineered Systems to design, install, and maintain more than mechanical projects.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Dragados Offshore	Exact match	11510 Puerto Real, SpainHQ recorded Nov 6, 2026	1,001-5,000	1,579 contacts →
	Exact match “Founded in 1972, Dragados Offshore S.A.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Elsewedy Electric Power Systems Projects	Exact match	Cairo, EgyptHQ recorded Nov 6, 2026	1,001-5,000	1,529 contacts →
	Exact match “An integrated energy solutions -design and build- provider specialized in Power Generation, Water Treatment and Hydropower while currently diversifying our business segments to…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Macdonald-Miller Facility Solutions	Exact match	Seatac, WA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,424 contacts →
	Exact match “MacDonald-Miller Facility Solutions is a full-service, design-build mechanical contractor in the Pacific Northwest.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Comfort Systems USA	Exact match	Houston, IN, United StatesHQ recorded Nov 6, 2026	10001+	1,407 contacts →
	Exact match “Comfort Systems USA \| Quality People.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Ormat Technologies, INC	Exact match	Reno, NV, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,328 contacts →
	Exact match “Clean, reliable energy solutions provided by geothermal power, recovered energy, and energy storage solutions are our expertise, commitment, and focus.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Soletanche Bachy	Exact match	Rueil-malmaison, FranceHQ recorded Nov 6, 2026	5,001-10,000	1,306 contacts →
	Exact match “Soletanche Bachy is a world benchmark in foundations and soil technologies, and is involved in over projects every year.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	First Balfour	Exact match	Parañaque, PhilippinesHQ recorded Nov 6, 2026	5,001-10,000	1,230 contacts →
	Exact match “First Balfour, Inc.(First Balfour) is one of the leading engineering and construction companies in the Philippines today.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Sepcoiii Electric Power Construction Co., LTD	Exact match	Dubai, United Arab EmiratesHQ recorded Nov 6, 2026	10001+	1,159 contacts →
	Exact match “Electrical Power Construction Co, Ltd.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Mckenney's, INC	Exact match	Atlanta, NC, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,143 contacts →
	Exact match “McKenney’s is the Southeast’s most trusted name in facility construction, operation and maintenance.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Wanzek Construction, Inc., A Mastec Company	Exact match	Fargo, TX, United StatesHQ recorded Nov 6, 2026	1,001-5,000	977 contacts →
	Exact match “Wanzek Construction, Inc, a MasTec Renewables company, is a leading general construction contractor and clean energy services company headquartered in Fargo, North Dakota.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	BK Gulf LLC	Exact match	Dubai, United Arab EmiratesHQ recorded Nov 6, 2026	5,001-10,000	861 contacts →
	Exact match “Established in 1978, BK Gulf LLC is a leading contractor in electrical, mechanical, instrumentation and building services within the UAE & Middle East market.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Feenstra	Exact match	Lelystad, NetherlandsHQ recorded Nov 6, 2026	1,001-5,000	813 contacts →
	Exact match “Sinds het ontstaan in 1947 is Feenstra marktleider in installatietechniek met een nationale dekking.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	WHC Energy Services	Exact match	Broussard, TX, United StatesHQ recorded Nov 6, 2026	n/a	794 contacts →
	Exact match “WHC - A Surerus Murphy Company, is a privately held general contractor who provides construction services for renewable services, pipeline and related facilities to the oil and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Baker Group	Exact match	Ankeny, IA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	731 contacts →
	Exact match “Established in 1963, Baker Group is Iowa’s premier full-service specialty contractor-serving commercial, industrial, institutional, and mission-critical markets across the country.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	SEL Construction Corporation	Exact match	Loomis, CA, United StatesHQ recorded Nov 6, 2026	n/a	727 contacts →
	Exact match “Experienced commercial contractor specializing in renewable energy, electrical, and roofing projects for privately-owned buildings as well as state/local government buildings in…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Geotec	Exact match	Ate, BelgiumHQ recorded Nov 6, 2026	1,001-5,000	690 contacts →
	Exact match “Geotec S.A, empresa de perforación perteneciente a Boyles Bros, fue fundado en 1963 posicionándose como una empresa líder en la industria minera peruana.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Harder Mechanical Contractors, INC	Exact match	Portland, CA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	679 contacts →
	Exact match “Harder Mechanical is a nationally recognized contractor known for its strong safety culture, ability to meet demanding schedules, commitment to quality, and consistent delivery of…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Alterman, INC	Exact match	Live Oak, TX, United StatesHQ recorded Nov 6, 2026	501-1,000	632 contacts →
	Exact match “Since 1923, Alterman has provided electrical construction on many of San Antonio and Austin's most impressive landmarks and contemporary structures.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	SET Linings Int. S.A	Exact match	Moita, PortugalHQ recorded Nov 6, 2026	201-500	612 contacts →
	Exact match “Set Linings is the world's fastest growing Refractory Company delivering turn-key projects around the globe with engineering, material supply, installation, dry-out and heating-up…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Murphy Company	Exact match	St. Louis, MO, United StatesHQ recorded Nov 6, 2026	1,001-5,000	598 contacts →
	Exact match “Per Colorado State Law Our CO Plumbing Contractor License Our Master Plumbing License is MP.03001288.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	PT GEO Dipa Energi Persero	Exact match	Jakarta Selatan, IndonesiaHQ recorded Nov 6, 2026	201-500	591 contacts →
	Exact match “PT Geo Dipa Energi (Persero) is a State-Owned Company specializing in Geothermal Energy” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	Scmi INC	Exact match	Houston, United StatesHQ recorded Nov 6, 2026	n/a	549 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Arb, INC	Exact match	Irvine, CA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	547 contacts →
	Exact match “ARB Inc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	JH Kelly, LLC	Exact match	Longview, WA, United StatesHQ recorded Nov 6, 2026	501-1,000	535 contacts →
	Exact match “JH Kelly is a fourth generation, family-owned construction company that provides HVAC and plumbing services to commercial facility owners and acts as a self-performing industrial…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “geothermal contractors”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 21,729 geothermal contractors worldwide

See the full list, filter by size, metro and specialty, and access 63,192 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Geothermal contractors worldwide at a glance

As of Nov 6, 2026

26.5%Verified-email coverage

11.0Average contacts per company

11-50Median size (employees)

0.5%Largest-city concentration · London

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

9,875

11-50

7,658

51-200

2,640

201-500

513

501-1,000

180

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for geothermal contractors are linked below.
What qualifies: Company records worldwide whose business descriptions match “geothermal contractors” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 63,192 professional contacts with verified work emails across the full matched dataset. 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 November 6, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Geothermal contractors by location

58 lists · largest first

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

Countries

Cities

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “geothermal contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many geothermal contractors are there worldwide?

RevenueBase identified 21,729 company matches for geothermal contractors worldwide as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Acco Engineered Systems tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most geothermal contractors?

The United States leads with 6,674 companies, followed by the United Kingdom (1,580) and France (1,473). Every geothermal contractors list by country and city is linked on this page.

Which city has the most geothermal contractors?

London leads with 119 company records, followed by Houston (86) and Calgary (73).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 63,192 professional contacts with verified work emails tracked across these 21,729 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 6, 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 SmartSearch, 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.