Company lists · Data verified August 2026

Top 25 Clean energy consulting firms based in Finland

Name: Clean energy consulting firms based in Finland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 90 companies tracked

There are 90 clean energy consulting firms headquartered in Finland (RevenueBase, August 2026). RevenueBase tracks 584 professional contacts across them, including 286 with verified work emails and 40 with mobile numbers. Helsinki is the largest hub.

This list covers clean energy consulting firms headquartered in Finland, 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.

90Companies

584Contacts tracked

286Verified emails

40Mobile numbers

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The 25 largest clean energy consulting firms based in Finland

Ranked by team size

Top 25 of 90 clean energy consulting firms based in Finland, 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	Finnish Overseas Consultants Finnoc	Helsinki	51-200	39	11
2	Gaia Consulting	Turku	51-200	38	3
3	Etha OY	Helsinki	11-50	35	25
4	Kaskas	Helsinki	11-50	25	17
5	Lemkem	Lahti	51-200	25	16
6	Atoz OY	Tampere	11-50	24	21
7	Arenso OY Arctic Energy Solutions	Pori	51-200	23	14
8	Valonia	Turku Turku	11-50	22	13
9	Planora OY	Porvoo	11-50	20	14
10	Forus OY	Helsinki	11-50	19	12
11	CFE Finland OY	Vantaa	11-50	19	12
12	Planera	Helsinki	11-50	17	16
13	Greenstream Network LTD	Helsinki	11-50	13	6
14	Nolla E	Turku	11-50	12	8
15	Taigawise	Helsinki	1-10	10	7
16	Sustera Energy Consulting OY	Tampere	51-200	10	6
17	Planius	Helsinki	11-50	9	6
18	Energiaykkönen OY	Jyvaskyla	11-50	9	3
19	Novox OY	Espoo	1-10	8	7
20	Insinööritoimisto Vesitaito OY	Tampere	11-50	8	6
21	Alusta Consulting	Helsinki	1-10	8	5
22	Flexens OY AB	Mariehamn	11-50	6	5
23	Termode OY	Oulu	1-10	5	5
24	Windly	Helsinki	1-10	5	4
25	Suomen Energiainsinöörit OY	Helsinki	1-10	4	3

Showing 25 of 90 clean energy consulting firms based in Finland

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Clean energy consulting firms based in Finland at a glance

As of Aug 28, 2026

1-10Median size (employees)

HelsinkiLargest hub · 35 HQs

40Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

Clean energy consulting firms by metro

Metro	Companies
Clean energy consulting firms in Helsinki	35
Clean energy consulting firms in Espoo	10
Clean energy consulting firms in Tampere	7
Clean energy consulting firms in Turku	5
Clean energy consulting firms in Jyvaskyla	4
Clean energy consulting firms in Oulu	3
Clean energy consulting firms in Vantaa	3
Clean energy consulting firms in Vaasa	2

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 “clean energy consulting firms”, with match quality audited by blind human judging, and headquartered in Finland.
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 clean energy consulting firms are there based in Finland?

There are 90 clean energy consulting firms headquartered in Finland as of August 2026 (RevenueBase).

What is the largest company on this list?

Finnish Overseas Consultants Finnoc, headquartered in Helsinki, tops this list with the largest team on record.

Which city has the most clean energy consulting firms?

Helsinki leads with 35 headquartered companies, followed by Espoo (10) and Tampere (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 286 verified decision-maker contacts tracked across these 90 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.