Company lists · Data refreshed September 2026

Top 25 Energy engineering consulting firms based in Switzerland

Name: Energy engineering consulting firms based in Switzerland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 24, 2026 959 companies tracked

RevenueBase identified 959 energy engineering consulting firms headquartered in Switzerland as of September 2026 and tracks 9,443 professional contacts across them, including 4,290 with verified work emails and 156 with mobile numbers. Zurich is the largest hub.

This list covers energy engineering consulting firms headquartered in Switzerland, 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 24, 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 24, 2026 86% judged on-target in blind review

959Companies

9,443Contacts tracked

4,290Verified emails

156Mobile numbers

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The 25 largest energy engineering consulting firms based in Switzerland

Ranked by team size

Top 25 of 959 energy engineering consulting firms based in Switzerland, ranked by team size, largest first. Data refreshed Sep 24, 2026. RevenueBase Smart Search rates how each company's information relates to energy engineering consulting firms: 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	Amstein Walthert	Indirect evidence	Zurich, SwitzerlandHQ checked Sep 24, 2026	1,001-5,000	563 contacts →
	Indirect evidence “Ü Ingenieurskunst bedeutet, mit Ressourcen richtig umzugehen.” Source: RevenueBase Database · checked Sep 24, 2026
2	Gruner	Indirect evidence	Basel, SwitzerlandHQ checked Sep 24, 2026	1,001-5,000	462 contacts →
	Indirect evidence “Gruner at a glance Founded: 1862 in Basel, Switzerland Legal form: Since 1970, public limited company owned by the founding families and employees Employees: more than 1,200 from…” Source: RevenueBase Database · checked Sep 24, 2026
3	Holinger	Partial evidence	Liestal, SwitzerlandHQ checked Sep 24, 2026	501-1,000	265 contacts →
	Partial evidence “For over 90 years, HOLINGER has been solving engineering and scientific tasks in various specialist areas related to the water cycle.” Source: RevenueBase Database · checked Sep 24, 2026
4	Drees & Sommer Switzerland	Partial evidence	Zürich, SwitzerlandHQ checked Sep 24, 2026	201-500	164 contacts →
	Partial evidence “Drees & Sommer Switzerland is a consulting company providing a single source of consultation and implementation services for the real estate, infrastructure and industrial markets.” Source: RevenueBase Database · checked Sep 24, 2026
5	IUB Engineering LTD	Partial evidence	Bern 14, SwitzerlandHQ checked Sep 24, 2026	201-500	156 contacts →
	Partial evidence “IUB Engineering AG has been an overall planner for infrastructure systems for over 50 years.” Source: RevenueBase Database · checked Sep 24, 2026
6	HHM Gruppe Hefti. Hess. Martignoni	Partial evidence	Aarau, SwitzerlandHQ checked Sep 24, 2026	201-500	143 contacts →
	Partial evidence “An engineering company is only as good as the innovative spirit of its employees.” Source: RevenueBase Database · checked Sep 24, 2026
7	GLB Genossenschaft	Partial evidence	Langnau, SwitzerlandHQ checked Sep 24, 2026	501-1,000	142 contacts →
	Partial evidence “GLB ist die verlässliche Partnerin für Lebensräume – Die Expertin für energieeffiziente Sanierung, Neubau, Einfamilien- oder Mehrfamilienhaus, Gewerbe- oder Industriebau…” Source: RevenueBase Database · checked Sep 24, 2026
8	Planair	Indirect evidence	La Sagne, SwitzerlandHQ checked Sep 24, 2026	51-200	135 contacts →
	Indirect evidence “Ingénieurs de la transition énergétique depuis 1985.” Source: RevenueBase Database · checked Sep 24, 2026
9	Bühler Scherler AG	Partial evidence	St.gallen, SwitzerlandHQ checked Sep 24, 2026	51-200	92 contacts →
	Partial evidence “The whole is more than the total of its parts.» Aristotle We have been passionately engaged for three decades now in electrical engineering, building automation, and international…” Source: RevenueBase Database · checked Sep 24, 2026
10	Esolva AG	Partial evidence	Weinfelden, SwitzerlandHQ checked Sep 24, 2026	51-200	91 contacts →
	Partial evidence “Wir sind deine professionelle Partnerin mit langjähriger Praxiserfahrung in der Energie- und Industrie-Branche.” Source: RevenueBase Database · checked Sep 24, 2026
11	Tech Building	Indirect evidence	Perly - Genève, SwitzerlandHQ checked Sep 24, 2026	51-200	82 contacts →
	Indirect evidence “Acteur de référence depuis plus de 25 ans à Genève, TECH BUILDING est une entreprise dont le cœur de métier repose sur la réalisation d’infrastructures énergétiques du bâtiment et…” Source: RevenueBase Database · checked Sep 24, 2026
12	Ciel Electricité SA	Indirect evidence	Lausanne, SwitzerlandHQ checked Sep 24, 2026	51-200	74 contacts →
	Indirect evidence “CIEL est une marque d’Eiffage Énergie Systèmes Suisse.” Source: RevenueBase Database · checked Sep 24, 2026
13	INP Schweiz AG	Partial evidence	Turgi, SwitzerlandHQ checked Sep 24, 2026	51-200	71 contacts →
	Partial evidence “We offer engineering services in the fields of power conversion, medium voltage & industry, high voltage and power generation.” Source: RevenueBase Database · checked Sep 24, 2026
14	Betelec SA	Indirect evidence	Villars-ste-croix, SwitzerlandHQ checked Sep 24, 2026	51-200	69 contacts →
	Indirect evidence “Nous sommes une entreprise qui a pour but l'ingénierie, le conseil, la conception, l'établissement de projets, la direction des travaux et l'exploitation dans le domaine des…” Source: RevenueBase Database · checked Sep 24, 2026
15	Boess Gruppe	Indirect evidence	Bern, SwitzerlandHQ checked Sep 24, 2026	51-200	67 contacts →
	Indirect evidence “Wir sind nicht nur Elektroingenieure.” Source: RevenueBase Database · checked Sep 24, 2026
16	R B Engineering AG	Indirect evidence	Brugg, SwitzerlandHQ checked Sep 24, 2026	51-200	66 contacts →
	Indirect evidence “Als führendes Ingenieurunternehmen sind wir in allen Gebäudetechnikgebieten zu Hause.” Source: RevenueBase Database · checked Sep 24, 2026
17	RMB Engineering AG	Strong evidence	Zürich, SwitzerlandHQ checked Sep 24, 2026	51-200	62 contacts →
	Strong evidence “Als führendes Ingenieur- und Planungsunternehmen in den Bereichen Gebäude, Energie- und Umwelttechnik realisiert die RMB Engineering AG massgeschneiderte Lösungen für…” Source: RevenueBase Database · checked Sep 24, 2026
18	Horizonte-Group AG	Strong evidence	Luzern, SwitzerlandHQ checked Sep 24, 2026	51-200	58 contacts →
	Strong evidence “Management Consulting für die Energiewirtschaft Wir gestalten die Energiezukunft – mit innovativen Strategien, digitalen Lösungen und partnerschaftlicher Zusammenarbeit.” Source: RevenueBase Database · checked Sep 24, 2026
19	Techfirm Industrial Services	Strong evidence	Geneva, SwitzerlandHQ checked Sep 24, 2026	201-500	57 contacts →
	Strong evidence “Since 1998, Techfirm Industrial Services is an independent Swiss engineering consulting company.” Source: RevenueBase Database · checked Sep 24, 2026
20	SINEF	Indirect evidence	Givisiez, SwitzerlandHQ checked Sep 24, 2026	51-200	55 contacts →
	Indirect evidence “SINEF SA propose des services et des conseils dans les domaines de l’eau et de l'énergie pour les collectivités ainsi que pour les particuliers.” Source: RevenueBase Database · checked Sep 24, 2026
21	3-Plan AG	Partial evidence	Winterthur, SwitzerlandHQ checked Sep 24, 2026	51-200	54 contacts →
	Partial evidence “Wir sind ein kreatives Ingenieurbüro für Gebäudetechnik, Energie und Nachhaltigkeit.” Source: RevenueBase Database · checked Sep 24, 2026
22	Renera AG	Partial evidence	Basel, SwitzerlandHQ checked Sep 24, 2026	51-200	54 contacts →
	Partial evidence “Renera AG (formerly Energie Zukunft Schweiz AG) is a leading force on the road to a fully renewable energy world.” Source: RevenueBase Database · checked Sep 24, 2026
23	Weinmann-Energies SA	Partial evidence	Echallens, SwitzerlandHQ checked Sep 24, 2026	51-200	47 contacts →
	Partial evidence “Weinmann-Energies est un bureau d’ingénieurs-conseils EPFL-SIA-SuisseIng.” Source: RevenueBase Database · checked Sep 24, 2026
24	Bering AG	Indirect evidence	Bern 25, SwitzerlandHQ checked Sep 24, 2026	51-200	44 contacts →
	Indirect evidence “Die BERING ist eine Ingenieurunternehmung für die Beratung und Projektierung von Elektroanlagen aller Art.” Source: RevenueBase Database · checked Sep 24, 2026
25	Anex Ingenieure AG	Partial evidence	Zürich, SwitzerlandHQ checked Sep 24, 2026	51-200	40 contacts →
	Partial evidence “Anex Ingenieure ist ein Beratungs- und Planungsunternehmen für Gebäudetechnik, das ressourcenschonende Energie- und Medienkonzepte für Prozesse, Gebäude und Areale entwickelt.” Source: RevenueBase Database · checked Sep 24, 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: energy engineering consulting firms. 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 energy engineering consulting firms.
Partial evidence: Its own public description names part of energy engineering consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy engineering consulting firms. 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 959 energy engineering consulting firms based in Switzerland

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Energy engineering consulting firms based in Switzerland at a glance

As of Sep 24, 2026

45.4%Verified-email coverage

1.7%Mobile-number coverage

9.8Average contacts per company

1-10Median size (employees)

8.3%Largest-city concentration · Zurich

Sep 24, 2026Page data refreshed

Companies by employee count

1-10

607

11-50

258

51-200

201-500

501-1,000

1,001-5,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 26.0d

3,2460–30

96731–60

6561–90

090–180

12180+

Company record updated

Median 76.0d

00–30

1,01631–60

5,41161–90

2,58290–180

434180+

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 energy engineering consulting firms, 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 Switzerland whose own description of what they do matches “energy engineering consulting firms”. 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 energy engineering consulting firms), 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 energy engineering consulting firms, and records with no verified work email. Companies headquartered outside Switzerland 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, 4,290 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 24, 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 energy engineering consulting firms, 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 energy engineering consulting firms are there based in Switzerland?

RevenueBase identified 959 energy engineering consulting firms headquartered in Switzerland 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?

Amstein Walthert, headquartered in Zurich, tops this list with the largest team on record.

Which city has the most energy engineering consulting firms?

Zurich leads with 80 headquartered companies, followed by Lausanne (31) and Bern (19).

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 4,290 verified decision-maker contacts tracked across these 959 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 24, 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.