Company lists · Data verified August 2026

Top 25 Energy efficiency consulting firms based in Switzerland

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 237 companies tracked

There are 237 energy efficiency consulting firms headquartered in Switzerland (RevenueBase, August 2026). RevenueBase tracks 1,430 professional contacts across them, including 517 with verified work emails and 41 with mobile numbers. Zurich is the largest hub.

This list covers energy efficiency consulting firms headquartered in Switzerland, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

237Companies

1,430Contacts tracked

517Verified emails

41Mobile numbers

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The 25 largest energy efficiency consulting firms based in Switzerland

Ranked by team size

Top 25 of 237 energy efficiency consulting firms based in Switzerland, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Sontex SA	Sonceboz-Sombeval	51-200	78	22
2	Weinmann-Energies SA	Neuchatel	51-200	47	36
3	Anex Ingenieure AG	Basel	51-200	40	33
4	Lemon Consult AG	Basel	11-50	36	25
5	Caeli Ingénierie	Carouge	11-50	32	24
6	Energie-Agentur DER Wirtschaft Agence DE L Énergie Pour L Économie	Zurich	51-200	31	21
7	AZ Ingénieurs SA	Lausanne	11-50	27	17
8	Ecco2 Solutions AG	Givisiez	11-50	25	24
9	Enastra AG	Zurich	11-50	25	17
10	Weisskopf Partner Gmbh	Zurich	11-50	25	16
11	Tecnoservice Engineering SA	Fribourg	51-200	25	6
12	Ingenieurbüro IEM AG	Bern	11-50	21	9
13	SB Technique SA	Geneve	11-50	18	10
14	Guggisberg Kurz AG	Ostermundigen	51-200	18	6
15	Adolf Krebs AG	Grund Bei Gstaad	51-200	16	6
16	Gestical SA	Cadempino	11-50	15	7
17	Enerplan AG	Olten	11-50	15	4
18	Home Intelligence Sàrl	Lonay	11-50	15	4
19	Lenum AG	Buchs Kanton	11-50	13	13
20	P P Project Solutions SA	Yverdon	11-50	12	9
21	Oekowatt AG	Luzern	11-50	12	8
22	Energestion SA	Les Acacias	11-50	12	8
23	Imboden Solista AG	Horw	11-50	11	7
24	DM Energieberatung AG	Brugg	11-50	11	6
25	Emch Berger Revelio AG	Bern	11-50	10	4

Showing 25 of 237 energy efficiency consulting firms based in Switzerland

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Energy efficiency consulting firms based in Switzerland at a glance

As of Aug 28, 2026

1-10Median size (employees)

ZurichLargest hub · 17 HQs

41Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

170

11-50

51-200

Energy efficiency consulting firms by metro

Metro	Companies
Energy efficiency consulting firms in Zurich	17
Energy efficiency consulting firms in Lausanne	7
Energy efficiency consulting firms in Geneve	7
Energy efficiency consulting firms in Winterthur	5
Energy efficiency consulting firms in Neuchatel	4
Energy efficiency consulting firms in Luzern	3
Energy efficiency consulting firms in Bern	3

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “energy efficiency consulting firms”, with match quality audited by blind human judging, and headquartered in Switzerland.
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: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many energy efficiency consulting firms are there based in Switzerland?

There are 237 energy efficiency consulting firms headquartered in Switzerland as of August 2026 (RevenueBase).

What is the largest company on this list?

Sontex SA, headquartered in Sonceboz-Sombeval, tops this list with the largest team on record.

Which city has the most energy efficiency consulting firms?

Zurich leads with 17 headquartered companies, followed by Lausanne (7) and Geneve (7).

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 517 verified decision-maker contacts tracked across these 237 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.