Company lists · Data refreshed September 2026

Top 25 Clean tech companies based in Houston, United States

Name: Clean tech companies based in Houston, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 107 companies tracked

RevenueBase identified 107 clean tech companies headquartered in Houston, United States as of September 2026 and tracks 2,167 professional contacts across them, including 627 with verified work emails. New York is the largest hub.

This list covers clean tech companies headquartered in Houston, 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

107Companies

2,167Contacts tracked

627Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest clean tech companies based in Houston, United States

Ranked by team size

Top 25 of 107 clean tech companies based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to clean tech 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	Sunnova Energy	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	501-1,000	906 contacts →
	Partial evidence “Sunnova Energy International Inc.(NYSE: NOVA) is an industry-leading energy services company focused on making clean energy more accessible, reliable, and affordable for…” Source: RevenueBase Database · checked Sep 19, 2026
2	Anew Climate	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	200 contacts →
	Indirect evidence “Anew Climate is a global leader of diverse climate solutions, bringing innovative products and services to the public and private sectors to help reduce or offset their carbon…” Source: RevenueBase Database · checked Sep 19, 2026
3	Catalyze	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	156 contacts →
	Indirect evidence “Founded in 2017, Catalyze is a fully integrated developer and Independent Power Producer (IPP) of distributed renewable energy assets.” Source: RevenueBase Database · checked Sep 19, 2026
4	Clean Energy Services	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	101 contacts →
	Partial evidence “Clean Energy Services provides reliable services for renewable assets.” Source: RevenueBase Database · checked Sep 19, 2026
5	Climeco	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	96 contacts →
	Indirect evidence “ClimeCo is an award-winning leader in decarbonization, empowering global organizations with customized sustainability pathways.” Source: RevenueBase Database · checked Sep 19, 2026
6	E'kabel	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	96 contacts →
	Indirect evidence “At E’kabel, we design and implement solutions that drive efficiency, sustainability, and performance across energy operations.” Source: RevenueBase Database · checked Sep 19, 2026
7	Tokyo GAS America LTD	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	52 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
8	GEC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	n/a	37 contacts →
	Indirect evidence “GEC invests in innovative energy technology and software companies.” Source: RevenueBase Database · checked Sep 19, 2026
9	Sunshine Renewable Solutions	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	21 contacts →
	Indirect evidence “Texas' first NABCEP Accredited PV Installation Company • NABCEP Certified PV Installation Professional # PV-102117-017952 Sunshine Renewable Solutions was established to address…” Source: RevenueBase Database · checked Sep 19, 2026
10	Zolarzo	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	19 contacts →
	Indirect evidence “We are a company specialized in the installation of solar energy systems and roof replacement.” Source: RevenueBase Database · checked Sep 19, 2026
11	Energy Edge Consulting	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	13 contacts →
	Indirect evidence “Energy Edge offers strategic energy management and renewable energy solutions to a wide range of businesses and institutions.” Source: RevenueBase Database · checked Sep 19, 2026
12	Fenix Solutions, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	13 contacts →
	Indirect evidence “At Fenix Solutions, we're more than just an energy solutions provider.” Source: RevenueBase Database · checked Sep 19, 2026
13	Bison Fuels	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	13 contacts →
	Indirect evidence “Green hydrogen represents one of our planet’s best hopes for a sustainable future.” Source: RevenueBase Database · checked Sep 19, 2026
14	Bocci Engineering	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	13 contacts →
	Indirect evidence “Bocci is an energy and environmental engineering consultancy based in Houston, Texas providing high quality, innovative and cost-effective solutions that significantly reduce or…” Source: RevenueBase Database · checked Sep 19, 2026
15	547 Energy	Indirect evidence	Houston, United StatesHQ checked Sep 19, 2026	1-10	13 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
16	Connectgen LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	11 contacts →
	Indirect evidence “CONNECTING POWER, PROJECTS & PEOPLE ConnectGEN is developing renewable energy and energy storage projects across North America.” Source: RevenueBase Database · checked Sep 19, 2026
17	Prudential Energy	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	10 contacts →
	Indirect evidence “Energy supply cost reduction, corporate sustainability, renewable energy, energy efficiency and energy data intelligence.” Source: RevenueBase Database · checked Sep 19, 2026
18	KEY HTX	Indirect evidence	Houston, United StatesHQ checked Sep 19, 2026	1-10	10 contacts →
	Indirect evidence “At our core we are an energy-efficiency driven, general services company.” Source: RevenueBase Database · checked Sep 19, 2026
19	KNS Solar	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	10 contacts →
	Indirect evidence “Headquartered in Houston, TX right inside the Energy Corridor, KNS Solar, LLC, is a strategic international energy and project development corporation, with a combined experience…” Source: RevenueBase Database · checked Sep 19, 2026
20	Devaltec	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	9 contacts →
	Indirect evidence “We help companies and their investors succeed in the Energy Transition We offer integrated support in Consulting and Project Development in Sustainable Energy” Source: RevenueBase Database · checked Sep 19, 2026
21	PGW Solutions	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	9 contacts →
	Indirect evidence “PGW Solutions works with large commercial and industrial energy and water users across the United States to help reduce utility costs, improve operational efficiency, and solve…” Source: RevenueBase Database · checked Sep 19, 2026
22	Creatum Energy	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	7 contacts →
	Indirect evidence “Our expertise extends to data center, power generation, solar, wind, oil and gas, and other energy sources, providing clients with tailored strategies for a cleaner and more…” Source: RevenueBase Database · checked Sep 19, 2026
23	Amperion	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	7 contacts →
	Indirect evidence “Amperion provides installation, testing, troubleshooting, and commissioning in support of renewable construction.” Source: RevenueBase Database · checked Sep 19, 2026
24	Almika	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	6 contacts →
	Indirect evidence “Almika is set on disrupting how electricity is produced and consumed in today’s energy markets.” Source: RevenueBase Database · checked Sep 19, 2026
25	Beam Earth	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	5 contacts →
	Partial evidence “A clean technology-centric ecosystem, Beam Earth provides funding for environmentally-aligned businesses and services across the investment themes of clean energy, sustainability…” 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: clean tech 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 clean tech companies.
Partial evidence: Its own public description names part of clean tech companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name clean tech 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 107 clean tech companies based in Houston, United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 627 reachable decision-makers.

Free signup · no credit card

View the full list →

Clean tech companies based in Houston, United States at a glance

As of Sep 19, 2026

28.9%Verified-email coverage

20.3Average contacts per company

11-50Median size (employees)

114.0%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email recency for this list is measured across the whole United States list rather than for Houston, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 107 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 clean tech 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 Houston, United States whose own description of what they do matches “clean tech 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 clean tech 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 clean tech companies, and records with no verified work email. Companies headquartered outside Houston 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, 627 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.

Clean tech 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 clean tech 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 clean tech companies are there based in Houston, United States?

RevenueBase identified 107 clean tech companies headquartered in Houston, 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?

Sunnova Energy, headquartered in Houston, tops this list with the largest team on record.

Which city has the most clean tech companies?

New York leads with 122 headquartered companies, followed by Houston (107) and Chicago (61).

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 627 verified decision-maker contacts tracked across these 107 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.

Ready to reach these companies? Verified emails and direct dials for all 107 clean tech companies based in Houston, United States. Start with a free account, no credit card.

Download this list →

Related lists

Clean tech companies by geography

Browse the directory

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.