Company lists · Data refreshed September 2026

Top 25 Geothermal exploration companies based in the United States

Name: Geothermal exploration companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 385 companies tracked

RevenueBase identified 385 geothermal exploration companies headquartered in the United States as of September 2026 and tracks 7,827 professional contacts across them, including 3,412 with verified work emails. Houston is the largest hub.

This list covers geothermal exploration companies headquartered in the United States, 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.

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

385Companies

7,827Contacts tracked

3,412Verified emails

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The 25 largest geothermal exploration companies based in the United States

Ranked by team size

Top 25 of 385 geothermal exploration companies based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to geothermal exploration 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	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
3	Saexploration	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	201-500	521 contacts →
	Indirect evidence “SAExploration offers a full range of geophysical ground acquisition services from design, prospecting, drilling, recording and analysis of field quality, as well as mobilization…” Source: RevenueBase Database · checked Sep 20, 2026
4	Stratum Reservoir	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	501-1,000	415 contacts →
	Indirect evidence “In 2019, Stratum Reservoir, formerly Weatherford Laboratories, became an independent and dynamic organization.” Source: RevenueBase Database · checked Sep 20, 2026
5	Degolyer And Macnaughton	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 20, 2026	201-500	268 contacts →
	Indirect evidence “Reserves assessments and appraisals • Prospective resources assessments • Unconventional resources assessments • Contingent resources assessments • Reservoir simulation •…” Source: RevenueBase Database · checked Sep 20, 2026
6	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
7	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
8	Zion OIL & Gas, INC	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 20, 2026	11-50	130 contacts →
	Indirect evidence “Zion’s vision of finding oil and/or natural gas in Israel, is Biblically inspired.” Source: RevenueBase Database · checked Sep 20, 2026
9	Microseismic, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	51-200	79 contacts →
	Partial evidence “Specialist in Real-Time Completions Intelligence for Fracture Geometry & Efficiency \| Geohazards \| Stress Field \| CCUS \| Geothermal \| FDI \| Sinkhole Detection \| Induced Seismicity…” Source: RevenueBase Database · checked Sep 20, 2026
10	Rangefront Mining Services	Partial evidence	Elko, NV, United StatesHQ checked Sep 20, 2026	51-200	79 contacts →
	Partial evidence “Rangefront exists to serve your mining or exploration project in the most efficient, advanced, and forward-thinking way.” Source: RevenueBase Database · checked Sep 20, 2026
11	Midstates Petroleum Company LLC	Partial evidence	Tulsa, OK, United StatesHQ checked Sep 20, 2026	51-200	71 contacts →
	Partial evidence “Midstates Petroleum Company LLC is an independent exploration and production company focused on the application of modern drilling and completion techniques to oil/liquids-prone…” Source: RevenueBase Database · checked Sep 20, 2026
12	Zonge International	Partial evidence	Reno, NV, United StatesHQ checked Sep 20, 2026	51-200	64 contacts →
	Partial evidence “Minerals / Geothermal / Groundwater / Petroleum / Environmental / Infrastructure Are you concerned about ensuring every opportunity for success for your project and stakeholders?” Source: RevenueBase Database · checked Sep 20, 2026
13	Quaise Energy	Partial evidence	Houston, MA, United StatesHQ checked Sep 20, 2026	51-200	62 contacts →
	Partial evidence “Quaise develops superhot geothermal power plants for a terawatt-scale world.” Source: RevenueBase Database · checked Sep 20, 2026
14	Terra Guidance, LLC	Indirect evidence	Englewood, CO, United StatesHQ checked Sep 20, 2026	51-200	59 contacts →
	Indirect evidence “Terra Guidance provides geological analysis remotely, onsite, and in-house.” Source: RevenueBase Database · checked Sep 20, 2026
15	Paragon Geophysical Services, INC	Indirect evidence	Wichita, KS, United StatesHQ checked Sep 20, 2026	51-200	59 contacts →
	Indirect evidence “Headquartered in Wichita, Kansas, and founded in 1993, Paragon Geophysical Services, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
16	Geometrics INC	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 20, 2026	51-200	52 contacts →
	Indirect evidence “Empowering geoscientists everywhere to explore and quantify the world since 1969.” Source: RevenueBase Database · checked Sep 20, 2026
17	Cheveron Stations INC	Partial evidence	San Ramon, CA, United StatesHQ checked Sep 20, 2026	n/a	52 contacts →
	Partial evidence “Chevron works to meet the world's growing demand for energy by exploring for oil and natural gas; refining and marketing gasoline; producing chemicals and geothermal power and…” Source: RevenueBase Database · checked Sep 20, 2026
18	Darcy Solutions	Partial evidence	New Brighton, MN, United StatesHQ checked Sep 20, 2026	11-50	38 contacts →
	Partial evidence “Darcy Solutions is on a mission to put Geothermal Everywhere.” Source: RevenueBase Database · checked Sep 20, 2026
19	BIG Rock Exploration	Partial evidence	Stillwater, MN, United StatesHQ checked Sep 20, 2026	11-50	36 contacts →
	Partial evidence “Big Rock Exploration, LLC (BRE) specializes in mineral and mining exploration offering clients experience in project management, resource targeting, asset development and geologic…” Source: RevenueBase Database · checked Sep 20, 2026
20	XGS Energy	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 20, 2026	11-50	34 contacts →
	Partial evidence “XGS Energy is a geothermal energy company founded and headquartered in Palo Alto, CA.” Source: RevenueBase Database · checked Sep 20, 2026
21	Burgex Mining Consultants	Partial evidence	Midvale, UT, United StatesHQ checked Sep 20, 2026	11-50	33 contacts →
	Partial evidence “Burgex Mining Consultants is a full-service mineral exploration and consulting firm dedicated to solving the challenges of mining and adding value at every stage of the project…” Source: RevenueBase Database · checked Sep 20, 2026
22	Boart Long Year	Indirect evidence	Oakdale, CA, United StatesHQ checked Sep 20, 2026	201-500	32 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
23	EDEN	Indirect evidence	Somerville, MA, United StatesHQ checked Sep 20, 2026	11-50	31 contacts →
	Indirect evidence “Eden is a leader in sustainable natural resource recovery.” Source: RevenueBase Database · checked Sep 20, 2026
24	Lettis Consultants International, INC	Indirect evidence	Concord, CA, United StatesHQ checked Sep 20, 2026	11-50	30 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
25	Escondido Resources	Partial evidence	Katy, TX, United StatesHQ checked Sep 20, 2026	11-50	30 contacts →
	Partial evidence “Escondido Resources is a private independent exploration, production and development company focused on developing conventional and unconventional reserves in South Texas.” 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 exploration 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 exploration companies.
Partial evidence: Its own public description names part of geothermal exploration companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geothermal exploration 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 385 geothermal exploration companies based in the United States

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Geothermal exploration companies based in the United States at a glance

As of Sep 20, 2026

43.6%Verified-email coverage

20.3Average contacts per company

1-10Median size (employees)

15.1%Largest-city concentration · Houston

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

229

11-50

118

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 385 companies.

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 exploration 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “geothermal exploration 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 exploration 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 exploration companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 3,412 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 exploration companies by metro

Geothermal exploration companies in Houston58

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 exploration 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 exploration companies are there based in the United States?

RevenueBase identified 385 geothermal exploration companies headquartered in the United States 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 city has the most geothermal exploration companies?

Houston leads with 58 headquartered companies, followed by Reno (15) and Dallas (11).

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 3,412 verified decision-maker contacts tracked across these 385 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.