Company lists · Data refreshed September 2026

Top 24 Energy transition companies based in San Francisco, United States

RevenueBase identified 58 company matches for energy transition companies associated with San Francisco, United States as of September 2026 and tracks 11,922 professional contacts across them, including 4,899 with verified work emails. Across the United States, New York is the largest hub for this category (137 companies); San Francisco has 58.

This list covers company matches for energy transition companies associated with San Francisco, 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 15, 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 15, 2026 How this list was built
58Companies
11,922Contacts tracked
4,899Verified emails
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The 24 largest energy transition companies based in San Francisco, United States

Ranked by team size
Top 24 of 58 company matches for energy transition companies based in San Francisco, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 15, 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 matchSan Francisco, CA, United StatesHQ recorded Sep 15, 202610001+7,974 contacts →

Exact match

“Life runs on clean energy.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
2Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 2026501-1,000908 contacts →

Exact match

“d.light is a global leader and pioneer in delivering affordable solar-powered solutions designed for the two billion people in the developing world without access to reliable…”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
3Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 2026501-1,000795 contacts →

Exact match

“Clearway Energy Group’s vision is a world powered by clean energy.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
4Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 2026501-1,000755 contacts →

Exact match

“Pattern Energy is one of the world’s largest privately-owned developers and operators of wind, solar, transmission, and energy storage projects.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
5Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 2026201-500324 contacts →

Exact match

“3Degrees is a leading global climate solutions provider, pioneer of environmental markets, and Certified B Corporation.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
6Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 202651-200148 contacts →

Exact match

“ForeFront Power is a leading developer of commercial and industrial-scale (C&I) solar energy and battery storage projects in the U.S.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
7Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 2026201-50082 contacts →

Exact match

“Ecoplexus develops, constructs, owns and operates Renewable Energy projects at utility scale in the U.S, Mexico, Japan, and Southeast Asia.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
8Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 202651-20081 contacts →

Exact match

“Arka sells world’s most innovative lifestyle green energy solutions for a sustainable future.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
9Exact matchSan Francisco, United StatesHQ recorded Sep 15, 202611-5068 contacts →

Exact match

“Renewable Properties specializes in developing and investing in small-scale utility and commercial solar energy projects throughout the United States.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
10Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 202611-5053 contacts →

Exact match

“Linea Energy is a newly-formed Independent Power Producer aiming to change the status quo of how clean energy is developed and financed to rapidly increase the speed of deployment.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
11Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 202651-20032 contacts →

Exact match

“Luminalt designs, installs, and maintains premium solar electric systems for residential, commercial, and non-profit customers in the San Francisco Bay Area.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
12Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 202611-5031 contacts →

Exact match

“Candela Renewables, LLC is a developer of utility-scale solar and storage power projects.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
13Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 202611-5030 contacts →

Exact match

“BluePath is a leading financier of sustainable infrastructure.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
14Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 202611-5026 contacts →

Exact match

“OnSwitch, Inc.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
15Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 202611-5014 contacts →

Exact match

“Metrus Energy develops and finances sustainable energy projects at commercial, industrial, and institutional facilities.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
16Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 202611-5014 contacts →

Exact match

“Segue Sustainable Infrastructure is a principal investment firm providing development capital to renewable energy projects and the infrastructure enabling them.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
17Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 202611-5012 contacts →

Exact match

“SolarUnion is Silicon Valley’s leading provider of premium solar solutions for homeowners, businesses and non-profits.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
18Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 202611-5011 contacts →

Exact match

“TerraVerde is an independent energy advisor representing school districts, public agencies, and commercial enterprises.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
19Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 20261-1010 contacts →

Exact match

“10Power is redefining international development as sustainable innovation.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
20Exact matchSan Francisco, United StatesHQ recorded Sep 15, 20261-107 contacts →

Exact match

“ARC is a development, construction and program/construction management company.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
21Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 202611-504 contacts →

Exact match

“Build solar where it does the most good.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
22Exact matchSan Francisco, United StatesHQ recorded Sep 15, 20261-104 contacts →

Exact match

“We are on a mission to enable every business to be powered by clean, affordable energy.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
23Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 20261-104 contacts →

Exact match

“Huck is a tech-enabled investment fund on a mission to inspire, finance and build the next generation of energy providers.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase
24Exact matchSan Francisco, CA, United StatesHQ recorded Sep 15, 20261-103 contacts →

Exact match

“At Deep Green Solar we want to help build a stronger and sustainable economy.”

Recorded in the RevenueBase company graph · Sep 15, 2026 · View company records in RevenueBase

Showing 24 of 58 energy transition companies based in San Francisco, United States

See the full list, filter by size, metro and specialty, and access 4,899 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Energy transition companies based in San Francisco, United States at a glance

As of Sep 15, 2026
41.1%Verified-email coverage
205.6Average contacts per company
11-50Median size (employees)
Sep 15, 2026Page data refreshed

Companies by employee count

1-10
26
11-50
18
51-200
6
201-500
3
501-1,000
3
10001+
2

Email recency for this list is measured across the whole United States list rather than for San Francisco, so it is reported there. Company counts and contact totals on this page are exact for San Francisco, over 58 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 San Francisco, United States whose business descriptions match “energy transition companies” 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 4,899 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 15, 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 “energy transition companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many energy transition companies are there based in San Francisco, United States?

RevenueBase identified 58 company matches for energy transition companies associated with San Francisco, 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?

Sunrun 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 energy transition companies?

New York leads the United States with 137 company records, followed by Houston (126) and Austin (78). San Francisco has 58.

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 4,899 professional contacts with verified work emails tracked across these 58 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 15, 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.