Company lists · Data refreshed September 2026

Top 25 Cleantech companies based in Boston, United States

Name: Cleantech companies based in Boston, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 53 companies tracked

RevenueBase identified 53 cleantech companies headquartered in Boston, United States as of September 2026 and tracks 31,346 professional contacts across them, including 12,995 with verified work emails. New York is the largest hub.

This list covers cleantech companies headquartered in Boston, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

53Companies

31,346Contacts tracked

12,995Verified emails

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The 25 largest cleantech companies based in Boston, United States

Ranked by team size

Top 25 of 53 cleantech companies based in Boston, United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to cleantech companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	GE Vernova	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	10001+	29,528 contacts →
	Indirect evidence “GE Vernova is a purpose-built energy technology company on a mission to electrify to thrive and decarbonize the world.” Source: RevenueBase Database · checked Sep 19, 2026
2	Nexamp	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	201-500	607 contacts →
	Indirect evidence “Nexamp is leading the transformation to the new energy economy with proven solutions for the deployment and operation of solar energy assets.” Source: RevenueBase Database · checked Sep 19, 2026
3	Clean AIR Task Force	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	167 contacts →
	Indirect evidence “CATF advocates for the change in technologies and policies needed to get to a zero-emissions, high-energy planet at an affordable cost.” Source: RevenueBase Database · checked Sep 19, 2026
4	Massachusetts Clean Energy Center	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	149 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 19, 2026
5	Bluewave	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	125 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 19, 2026
6	Allonnia	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	11-50	69 contacts →
	Indirect evidence “Allonnia develops sustainable solutions to address some of the world’s most complex environmental challenges.” Source: RevenueBase Database · checked Sep 19, 2026
7	Resurety	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	65 contacts →
	Indirect evidence “Resurety is the only clean energy industry partner to bring together actionable market insights and groundbreaking transaction tools in one seamless ecosystem.” Source: RevenueBase Database · checked Sep 19, 2026
8	NEW Ecology, INC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	63 contacts →
	Indirect evidence “New Ecology works where the climate and housing crises converge.” Source: RevenueBase Database · checked Sep 19, 2026
9	Clean Energy Ventures	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	11-50	54 contacts →
	Indirect evidence “Clean Energy Ventures is a venture capital firm focused on investing in companies commercializing disruptive advanced energy technologies and business model innovations that can…” Source: RevenueBase Database · checked Sep 19, 2026
10	Citizens Energy Corporation	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	11-50	37 contacts →
	Indirect evidence “Citizens Energy Corporation is a nonprofit energy company that develops innovative energy ventures to make life's basic needs more affordable.” Source: RevenueBase Database · checked Sep 19, 2026
11	Renew Energy Partners	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	n/a	31 contacts →
	Indirect evidence “Renew Energy Partners provides turnkey solutions for funding, installing, and managing energy efficiency and on-site clean energy projects.” Source: RevenueBase Database · checked Sep 19, 2026
12	Galehead Development	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	11-50	24 contacts →
	Indirect evidence “Galehead is the leading upstream technology and services platform for planning, management and delivery of greenfield development pipeline for the Energy Transition.” Source: RevenueBase Database · checked Sep 19, 2026
13	Sustainability Roundtable, INC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	11-50	22 contacts →
	Indirect evidence “Sustainability Roundtable Inc.(SR Inc) works to be the world's most respected strategic advisor in enterprise decarbonization.” Source: RevenueBase Database · checked Sep 19, 2026
14	Cleantech Open Northeast ACT	Strong evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	18 contacts →
	Strong evidence “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…” Source: RevenueBase Database · checked Sep 19, 2026
15	Wave Equity Partners	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	11-50	12 contacts →
	Indirect evidence “Founded in 2013, WAVE Equity Partners is an independent sustainability-focused private investment firm that makes investments in early-growth companies whose proven clean…” Source: RevenueBase Database · checked Sep 19, 2026
16	SRGE	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	11 contacts →
	Indirect evidence “Strategic Resources and Growth Engine is a full-service construction innovation accelerator based in Boston.” Source: RevenueBase Database · checked Sep 19, 2026
17	Peregrine Energy Group	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	11-50	9 contacts →
	Indirect evidence “Peregrine Energy Group brings complex energy pictures into focus.” Source: RevenueBase Database · checked Sep 19, 2026
18	Sona Energy Solutions	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	8 contacts →
	Indirect evidence “Sona Energy Solutions brings over 35 years of turn-key, clean energy engineering and implementation expertise to our multi-site and multi-state retail, commercial and industrial…” Source: RevenueBase Database · checked Sep 19, 2026
19	RPM	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	7 contacts →
	Indirect evidence “In a changing climate, reducing energy and greenhouse gas emissions goes hand in hand with asset preservation, resiliency, and tenant health and well-being.” Source: RevenueBase Database · checked Sep 19, 2026
20	Consult Energy INC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	7 contacts →
	Indirect evidence “At Consult Energy we're on a mission to become the go-to renewable energy recruitment partner.” Source: RevenueBase Database · checked Sep 19, 2026
21	NET Zero Institute	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	6 contacts →
	Indirect evidence “We're redefining the relationship between business and the natural world to create competitive advantage while reducing adverse environmental impacts.” Source: RevenueBase Database · checked Sep 19, 2026
22	Windsail Capital Group LLC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	5 contacts →
	Indirect evidence “WindSail Capital Group is a leading provider of growth capital to companies within the clean energy economy.” Source: RevenueBase Database · checked Sep 19, 2026
23	Rivermoor Energy	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	11-50	3 contacts →
	Indirect evidence “Rivermoor Energy provides clean energy development, planning, financing, and investment solutions to corporate, commercial, utility, government and institutional (higher…” Source: RevenueBase Database · checked Sep 19, 2026
24	Graviky Labs	Strong evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	3 contacts →
	Strong evidence “Graviky Labs is a MIT spinoff working in developing cleantech solutions.” Source: RevenueBase Database · checked Sep 19, 2026
25	Castalune	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1-10	2 contacts →
	Indirect evidence “Castalune is the trusted partner of growth-oriented companies who are seeking a competitive edge in the global energy transition.” Source: RevenueBase Database · checked Sep 19, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: cleantech companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names cleantech companies.
Partial evidence: Its own public description names part of cleantech companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cleantech companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 53 cleantech companies based in Boston, United States

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Cleantech companies based in Boston, United States at a glance

As of Sep 19, 2026

41.5%Verified-email coverage

591.4Average contacts per company

1-10Median size (employees)

264.2%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

10001+

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 53 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among cleantech companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Boston, United States whose own description of what they do matches “cleantech companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names cleantech companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among cleantech companies, and records with no verified work email. Companies headquartered outside Boston are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 12,995 across the full list. 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.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Cleantech companies by metro in the United States

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names cleantech companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

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

RevenueBase identified 53 cleantech companies headquartered in Boston, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

GE Vernova, headquartered in Boston, tops this list with the largest team on record.

Which city has the most cleantech companies?

New York leads with 140 headquartered companies, followed by Houston (117) and San Francisco (79).

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 12,995 verified decision-maker contacts tracked across these 53 companies.

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 Smart Search, 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.