Company lists · Data refreshed September 2026

Top 25 Geothermal well drilling companies based in the United States

Name: Geothermal well drilling 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 19, 2026 267 companies tracked

RevenueBase identified 267 geothermal well drilling companies headquartered in the United States as of September 2026 and tracks 4,818 professional contacts across them, including 1,808 with verified work emails. Houston is the largest hub.

This list covers geothermal well drilling 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 19, 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 19, 2026 86% judged on-target in blind review

267Companies

4,818Contacts tracked

1,808Verified emails

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The 25 largest geothermal well drilling companies based in the United States

Ranked by team size

Top 25 of 267 geothermal well drilling companies based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to geothermal well drilling 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	Ormat Technologies, INC	Indirect evidence	Reno, NV, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,281 contacts →
	Indirect evidence “With over five decades of experience, Ormat Technologies, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
2	Scientific Drilling	Partial evidence	The Woodlands, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,134 contacts →
	Partial evidence “THE ULTIMATE PARTNER IN WELLBORE PLACEMENT Scientific Drilling International is an independent service provider offering a complete high accuracy wellbore placement and drilling…” Source: RevenueBase Database · checked Sep 19, 2026
3	AIR Drilling Associates	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	328 contacts →
	Strong evidence “ADA is a global energy services company specializing in advanced drilling solutions for oil, gas, and geothermal applications.” Source: RevenueBase Database · checked Sep 19, 2026
4	Grupo IPS	Indirect evidence	Conroe, TX, United StatesHQ checked Sep 19, 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 19, 2026
5	Fervo Energy	Partial evidence	Houston, CA, United StatesHQ checked Sep 19, 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 19, 2026
6	Hole Products	Partial evidence	Little Falls, MN, United StatesHQ checked Sep 19, 2026	51-200	83 contacts →
	Partial evidence “Hole Products is a leading manufacturer and supplier of high performance drilling supplies, tools and equipment to the construction, direct push, environmental, geotechnical…” Source: RevenueBase Database · checked Sep 19, 2026
7	Kenai Drilling Limited	Strong evidence	Bakersfield, CA, United StatesHQ checked Sep 19, 2026	51-200	76 contacts →
	Strong evidence “Kenai is one of the largest drilling contractors in the state of California with rigs available to conduct oil, gas and geothermal drilling on land as well as offshore.” Source: RevenueBase Database · checked Sep 19, 2026
8	Youngquist Brothers	Strong evidence	Fort Myers, FL, United StatesHQ checked Sep 19, 2026	51-200	73 contacts →
	Strong evidence “Youngquist Brothers is a privately held well drilling company focused on the construction of large diameter, Class 1 deep injection wells.” Source: RevenueBase Database · checked Sep 19, 2026
9	Allied Well Drilling	Strong evidence	Laurel, MD, United StatesHQ checked Sep 19, 2026	51-200	52 contacts →
	Strong evidence “We at Allied Well Drilling are a full service commercial and residential gethermal heating/cooling system installer, specializing in vertically drilled closed loop systems.” Source: RevenueBase Database · checked Sep 19, 2026
10	Darcy Solutions	Partial evidence	New Brighton, MN, United StatesHQ checked Sep 19, 2026	11-50	38 contacts →
	Partial evidence “Darcy Solutions is on a mission to put Geothermal Everywhere.” Source: RevenueBase Database · checked Sep 19, 2026
11	XGS Energy	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 19, 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 19, 2026
12	Parratt-Wolff, INC	Partial evidence	East Syracuse, NY, United StatesHQ checked Sep 19, 2026	51-200	28 contacts →
	Partial evidence “Environmental and Geotechnical Drilling Services Parratt-Wolff strives to ensure that every environmental or geotechnical site investigation meets or exceeds our client's…” Source: RevenueBase Database · checked Sep 19, 2026
13	Bedrock Energy	Partial evidence	Austin, TX, United StatesHQ checked Sep 19, 2026	11-50	27 contacts →
	Partial evidence “Our mission is to transform the heating & cooling of buildings, using geothermal energy to radically reduce costs for people and the environment.” Source: RevenueBase Database · checked Sep 19, 2026
14	Greenfire Energy INC	Partial evidence	Oklahoma City, OK, United StatesHQ checked Sep 19, 2026	11-50	23 contacts →
	Partial evidence “About GreenFire Energy GreenFire Energy engineers next-generation geothermal systems designed for real-world operating conditions.” Source: RevenueBase Database · checked Sep 19, 2026
15	ABC Liovin Drilling, INC	Partial evidence	Signal Hill, CA, United StatesHQ checked Sep 19, 2026	51-200	23 contacts →
	Partial evidence “Environmental and geotechnical drilling company with two offices based out of Signal Hill (Los Angeles), CA, Bloomington (San Bernardino), CA and Las Vegas, NV.” Source: RevenueBase Database · checked Sep 19, 2026
16	Open Mountain Energy	Partial evidence	Reno, NV, United StatesHQ checked Sep 19, 2026	11-50	22 contacts →
	Partial evidence “Open Mountain Energy combines its geothermal and project development expertise with Kaishan Group's power plant technologies and manufacturing to form a cutting-edge industry…” Source: RevenueBase Database · checked Sep 19, 2026
17	OIL Well Service Company	Partial evidence	Signal Hill, CA, United StatesHQ checked Sep 19, 2026	51-200	22 contacts →
	Partial evidence “Oil Well Service Co Complete Well Services Work Overs Abandonments Completions Geo-Thermal” Source: RevenueBase Database · checked Sep 19, 2026
18	Geologica Geothermal Group, INC	Partial evidence	Reno, NV, United StatesHQ checked Sep 19, 2026	11-50	17 contacts →
	Partial evidence “Geologica excels in Geothermal Resource Consulting by providing high quality global geothermal resource exploration, development and assessment services for private and public…” Source: RevenueBase Database · checked Sep 19, 2026
19	Sam's Well Drilling	Strong evidence	Randolph, WI, United StatesHQ checked Sep 19, 2026	51-200	17 contacts →
	Strong evidence “Sam's Well Drilling is the Midwest's premier drilling company.” Source: RevenueBase Database · checked Sep 19, 2026
20	Teverra	Indirect evidence	Atlanta, United StatesHQ checked Sep 19, 2026	11-50	17 contacts →
	Indirect evidence “TEVERRA creates subsurface insight through innovation.” Source: RevenueBase Database · checked Sep 19, 2026
21	Harris Exploration Drilling An Earth Drilling USA Company	Partial evidence	Fallon, NV, United StatesHQ checked Sep 19, 2026	11-50	16 contacts →
	Partial evidence “We specialize in: Angle or Vertical, Dual Tube/ RC and Conventional Rotary Drilling.” Source: RevenueBase Database · checked Sep 19, 2026
22	TNG Energy Services INC	Indirect evidence	Bakersfield, CA, United StatesHQ checked Sep 19, 2026	11-50	15 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
23	RAM Power, Corp	Indirect evidence	Reno, United StatesHQ checked Sep 19, 2026	51-200	15 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
24	GEFCO	Strong evidence	Conroe, TX, United StatesHQ checked Sep 19, 2026	51-200	13 contacts →
	Strong evidence “GEFCO is a world leader in the water well drilling industry, manufacturing portable drilling rigs and related equipment for the water well, environmental, groundwater monitoring…” Source: RevenueBase Database · checked Sep 19, 2026
25	Dewhurst Group LLC	Indirect evidence	Germantown, MD, United StatesHQ checked Sep 19, 2026	11-50	13 contacts →
	Indirect evidence “Dewhurst Group (DG) is an energy exploration and development company.” Source: RevenueBase Database · checked Sep 19, 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 well drilling 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 well drilling companies.
Partial evidence: Its own public description names part of geothermal well drilling companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geothermal well drilling 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 267 geothermal well drilling companies based in the United States

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Geothermal well drilling companies based in the United States at a glance

As of Sep 19, 2026

37.5%Verified-email coverage

18.0Average contacts per company

1-10Median size (employees)

3.7%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

137

11-50

51-200

201-500

1,001-5,000

5,001-10,000

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 267 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 well drilling 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 well drilling 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 well drilling 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 well drilling 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, 1,808 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 19, 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.

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 well drilling 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 well drilling companies are there based in the United States?

RevenueBase identified 267 geothermal well drilling 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?

Ormat Technologies, INC, headquartered in Reno, tops this list with the largest team on record.

Which city has the most geothermal well drilling companies?

Houston leads with 10 headquartered companies, followed by Austin (6) and Reno (5).

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 1,808 verified decision-maker contacts tracked across these 267 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 19, 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.