Company lists · Data refreshed September 2026

Top 12 Sustainable energy consultants based in Japan

RevenueBase identified 52 company matches for sustainable energy consultants associated with Japan as of September 2026 and tracks 248 professional contacts across them, including 32 with verified work emails. Tokyo is the largest hub.

This list covers company matches for sustainable energy consultants associated with Japan, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 18, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 18, 2026 How this list was built
52Companies
248Contacts tracked
32Verified emails
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The 12 largest sustainable energy consultants based in Japan

Ranked by team size
Top 12 of 52 company matches for sustainable energy consultants based in Japan, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 18, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact match港区, JapanHQ recorded Sep 18, 202651-20024 contacts →

Exact match

“GPSS Engineering is an EPC company, specializing in sustainable energy engineering.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
2Exact matchTokyo, JapanHQ recorded Sep 18, 202651-20021 contacts →

Exact match

“SUNERGY nace de la unión de varias empresas del sector del montaje.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
3Exact matchNagasaki, JapanHQ recorded Sep 18, 202651-20014 contacts →

Exact match

“Iwatec Corporation is a Japan-based engineering and consultancy firm powering the global shift to renewable energy.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
4Exact match大阪市, JapanHQ recorded Sep 18, 20261-1010 contacts →

Exact match

“We have a strong network with both domestic and international experts in energy and environment sectors.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
5Exact matchChiyoda-ku, JapanHQ recorded Sep 18, 202611-505 contacts →

Exact match

“Clean Energy Connect Inc.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
6Exact matchMinato-ku, JapanHQ recorded Sep 18, 202651-2005 contacts →

Exact match

“Quantum Group is a company in the renewable energy industry (wind, solar, bioenergy, micro hydraulic) providing project development, financing, Engineering, EPC Contracting and…”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
7Exact match港区, JapanHQ recorded Sep 18, 20261-104 contacts →

Exact match

“PPA Ene Buyer is an energy management services company that works on behalf of business customers to navigate complex energy markets to source economical electricity supply, net…”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
8Exact match千代田区, JapanHQ recorded Sep 18, 202651-2004 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
9Exact matchTokyo, JapanHQ recorded Sep 18, 2026201-5003 contacts →

Exact match

“Rezil is on a mission to make decarbonization effortless.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
10Exact match大阪市淀川区, JapanHQ recorded Sep 18, 2026201-5003 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
11Exact matchTokyo, JapanHQ recorded Sep 18, 20261-103 contacts →

Exact match

“Renewable energy investment venture.”

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
12Exact match目黒区, JapanHQ recorded Sep 18, 20261-101 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase

Showing 12 of 52 sustainable energy consultants based in Japan

See the full list, filter by size, metro and specialty, and access 32 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Sustainable energy consultants based in Japan at a glance

As of Sep 18, 2026
12.9%Verified-email coverage
4.8Average contacts per company
11-50Median size (employees)
17.3%Largest-city concentration · Tokyo
Sep 18, 2026Page data refreshed

Companies by employee count

1-10
17
11-50
14
51-200
12
201-500
6

Email recency for this list is measured worldwide rather than for Japan, so it is reported there. Company counts and contact totals on this page are exact for Japan, over 52 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies
Company records associated with Japan whose business descriptions match “sustainable energy consultants” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 32 professional contacts with verified work emails across the full matched dataset. 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 18, 2026. Lists refresh periodically as the graph is re-checked.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “sustainable energy consultants”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many sustainable energy consultants are there based in Japan?

RevenueBase identified 52 company matches for sustainable energy consultants associated with Japan as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Gpss Engineering INC tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most sustainable energy consultants?

Tokyo leads with 9 company records, followed by Jing (8) and Xian (3).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 32 professional contacts with verified work emails tracked across these 52 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 18, 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 SmartSearch, 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.