Company lists · Data refreshed September 2026

Top 19 Cleantech startups based in Boston, United States

RevenueBase identified 39 company matches for cleantech startups associated with Boston, United States as of September 2026 and tracks 30,922 professional contacts across them, including 12,841 with verified work emails. Across the United States, New York is the largest hub for this category (102 companies); Boston has 39.

This list covers company matches for cleantech startups associated with Boston, United States, 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 19, 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 19, 2026 How this list was built
39Companies
30,922Contacts tracked
12,841Verified emails
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The 19 largest cleantech startups based in Boston, United States

Ranked by team size
Top 19 of 39 company matches for cleantech startups based in Boston, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 19, 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 matchBoston, MA, United StatesHQ recorded Sep 19, 202610001+29,528 contacts →

Exact match

“GE Vernova is a purpose-built energy technology company on a mission to electrify to thrive and decarbonize the world.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
2Exact matchBoston, MA, United StatesHQ recorded Sep 19, 2026201-500607 contacts →

Exact match

“Nexamp is leading the transformation to the new energy economy with proven solutions for the deployment and operation of solar energy assets.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
3Exact matchBoston, MA, United StatesHQ recorded Sep 19, 202651-200167 contacts →

Exact match

“CATF advocates for the change in technologies and policies needed to get to a zero-emissions, high-energy planet at an affordable cost.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
4Exact matchBoston, MA, United StatesHQ recorded Sep 19, 202651-200149 contacts →

Exact match

“The Massachusetts Clean Energy Center is a state economic development agency dedicated to accelerating the growth of the clean energy and climatetech sector across the…”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
5Exact matchBoston, MA, United StatesHQ recorded Sep 19, 202651-200125 contacts →

Exact match

“BlueWave is a mission-driven clean energy developer, owner, and operator building solar and energy storage solutions that strengthen the electric grid and deliver long-term grid…”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
6Exact matchBoston, MA, United StatesHQ recorded Sep 19, 202651-20065 contacts →

Exact match

“Resurety is the only clean energy industry partner to bring together actionable market insights and groundbreaking transaction tools in one seamless ecosystem.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
7Exact matchBoston, MA, United StatesHQ recorded Sep 19, 202611-5054 contacts →

Exact match

“Clean Energy Ventures is a venture capital firm focused on investing in companies commercializing disruptive advanced energy technologies and business model innovations that can…”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
8Exact matchBoston, MA, United StatesHQ recorded Sep 19, 202611-5037 contacts →

Exact match

“Citizens Energy Corporation is a nonprofit energy company that develops innovative energy ventures to make life's basic needs more affordable.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
9Exact matchBoston, MA, United StatesHQ recorded Sep 19, 202611-5024 contacts →

Exact match

“Galehead is the leading upstream technology and services platform for planning, management and delivery of greenfield development pipeline for the Energy Transition.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
10Exact matchBoston, MA, United StatesHQ recorded Sep 19, 20261-1018 contacts →

Exact match

“Cleantech Open is the oldest and largest cleantech startup accelerator program, with the mission to find, fund, and foster entrepreneurs with ideas to solve our greatest…”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
11Exact matchBoston, MA, United StatesHQ recorded Sep 19, 20261-1011 contacts →

Exact match

“Strategic Resources and Growth Engine is a full-service construction innovation accelerator based in Boston.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
12Exact matchBoston, MA, United StatesHQ recorded Sep 19, 202611-506 contacts →

Exact match

“Omni Navitas partners with commercial and industrial property owners, agricultural land and farm owners, and government agencies to implement revenue-generating solar solutions…”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
13Exact matchBoston, MA, United StatesHQ recorded Sep 19, 20261-105 contacts →

Exact match

“WindSail Capital Group is a leading provider of growth capital to companies within the clean energy economy.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
14Exact matchBoston, MA, United StatesHQ recorded Sep 19, 202611-503 contacts →

Exact match

“Rivermoor Energy provides clean energy development, planning, financing, and investment solutions to corporate, commercial, utility, government and institutional (higher…”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
15Exact matchBoston, MA, United StatesHQ recorded Sep 19, 20261-103 contacts →

Exact match

“Graviky Labs is a MIT spinoff working in developing cleantech solutions.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
16Exact matchBoston, United StatesHQ recorded Sep 19, 20261-101 contacts →

Exact match

“Leiboh Consulting Services is available for project based or long term consulting in the water technology and clean tech industries.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
17Exact matchBoston, MA, United StatesHQ recorded Sep 19, 20261-101 contacts →

Exact match

“Impact Investing at the Fulcrum of Technology & Environment ® Renewable Energy | Energy Access | Smart Grid | Smart Buildings | IOT | Robotics | Artificial Intelligence | AR/VR |…”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
18Exact matchBoston, MA, United StatesHQ recorded Sep 19, 20261-101 contacts →

Exact match

“Climate Venture Partners is currently raising a pre-seed round for Applied Bioplastics.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
19Exact matchBoston, MA, United StatesHQ recorded Sep 19, 20261-101 contacts →

Exact match

“We are a renewable energy consulting company specializing in project development, value engineering, and construction management.”

Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase

Showing 19 of 39 cleantech startups based in Boston, United States

See the full list, filter by size, metro and specialty, and access 12,841 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Cleantech startups based in Boston, United States at a glance

As of Sep 19, 2026
41.5%Verified-email coverage
792.9Average contacts per company
11-50Median size (employees)
Sep 19, 2026Page data refreshed

Companies by employee count

1-10
18
11-50
13
51-200
6
201-500
1
10001+
1

Email recency for this list is measured across the whole United States list rather than for Boston, so it is reported there. Company counts and contact totals on this page are exact for Boston, over 39 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 Boston, United States whose business descriptions match “cleantech startups” 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 12,841 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 19, 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 “cleantech startups”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many cleantech startups are there based in Boston, United States?

RevenueBase identified 39 company matches for cleantech startups associated with Boston, United States 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?

GE Vernova tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most cleantech startups?

New York leads the United States with 102 company records, followed by Houston (82) and San Francisco (71). Boston has 39.

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 12,841 professional contacts with verified work emails tracked across these 39 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 19, 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.