Company lists · Data verified August 2026

Top 25 Energy efficiency consulting firms based in France

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 1,218 companies tracked

There are 1,218 energy efficiency consulting firms headquartered in France (RevenueBase, August 2026). RevenueBase tracks 20,245 professional contacts across them, including 8,569 with verified work emails and 359 with mobile numbers. Paris is the largest hub.

This list covers energy efficiency consulting firms headquartered in France, 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.

1,218Companies

20,245Contacts tracked

8,569Verified emails

359Mobile numbers

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The 25 largest energy efficiency consulting firms based in France

Ranked by team size

Top 25 of 1,218 energy efficiency consulting firms based in France, 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	Dalkia	Saint-Andre-Lez-Lille	10001+	8,459	4,167
2	Veolia Industries Global Solutions	Aubervilliers	1,001-5,000	469	181
3	Greenflex	Paris	501-1,000	400	211
4	Manergy	Creteil	501-1,000	311	207
5	EFFY	Paris	201-500	298	145
6	Hellio	Clichy	201-500	292	163
7	Nepsen	Vincennes	51-200	219	136
8	Ex'im	La Madeleine	201-500	212	52
9	Alliance DES Énergies	Paris	51-200	161	92
10	accenta.ai	Boulogne-Billancourt	51-200	151	100
11	Sénova	Grenoble	51-200	137	79
12	Certinergy	La Garenne-Colombes	51-200	134	32
13	Teksial	Colombes	201-500	122	14
14	SNECI	n/a	51-200	107	57
15	Energies France	Gennevilliers	51-200	105	60
16	CDC Conseil	Lille	51-200	98	51
17	Sinteo	Paris	51-200	95	67
18	Place DES Énergies	Saultain	51-200	95	54
19	Energie & Service	n/a	51-200	92	53
20	NRGYS	Nanterre	51-200	88	60
21	ECO Environnement	n/a	51-200	84	30
22	Etamine	Lille	51-200	81	63
23	Solab Ingénierie & Environnement	Rennes	51-200	73	49
24	New-E	Paris	51-200	72	52
25	Green Energy Service	n/a	51-200	70	42

Showing 25 of 1,218 energy efficiency consulting firms based in France

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Energy efficiency consulting firms based in France at a glance

As of Aug 28, 2026

1-10Median size (employees)

ParisLargest hub · 171 HQs

359Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

816

11-50

303

51-200

201-500

501-1,000

1,001-5,000

10001+

Energy efficiency consulting firms by metro

Metro	Companies
Energy efficiency consulting firms in Paris	171
Energy efficiency consulting firms in Lyon	58
Energy efficiency consulting firms in Toulouse	29
Energy efficiency consulting firms in Lille	16
Energy efficiency consulting firms in Marseille	15
Energy efficiency consulting firms in Montpellier	14
Energy efficiency consulting firms in Bordeaux	14

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 France.
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 France?

There are 1,218 energy efficiency consulting firms headquartered in France as of August 2026 (RevenueBase).

What is the largest company on this list?

Dalkia, headquartered in Saint-Andre-Lez-Lille, tops this list with the largest team on record.

Which city has the most energy efficiency consulting firms?

Paris leads with 171 headquartered companies, followed by Lyon (58) and Toulouse (29).

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 8,569 verified decision-maker contacts tracked across these 1,218 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.