Company lists
The California edition · 2026

Environmentcompanies in California

Solar energy, waste & water, green buildings, wind energy, startups and more: the companies building environment in California, with their founders, funding, team size and business models.

1,516 company profiles145 with recorded fundingNovember 2026 edition
California · Photo: Wikimedia Commons (Public domain)

Recent environment business events in California

Funding, M&A, contract wins and launches involving 1,953 environment companies in California, last 24 months: 70 M&A deals · 45 Contracts · 31 funding rounds · 2 launches. Newest first; companies and investors link to their Fliar profiles. Latest event in our news feed: Jun 2026.

ContractSupply

Linea Energy · client: Google

Linea Energy signed a 15-year, 500-MW PPA in May 2026 for its Duffy Solar Project in Matagorda County, Texas.

Renewable Energy
M&AMerger · Completed

Austin american technology acquires Aqua klean systems

AAT has merged with Aqua Klean Systems (AKS) to create one company, the largest full-service cleaning company in the electronics industry.

Electronics cleaning equipment manufacturing
FundingSeed

Sparq

SPARQ, an AI-native game engine and creator platform headquartered in Ras Al Khaimah's Innovation City, has opened an $8.5 million seed funding round with early participation from…

Investors Andreessen Horowitz's (a16z) Scout Fund
AI
M&AAcquisition · Completed

Jack Wang Motors Group acquires Everpower

Marubeni Corp. has transferred its entire 40% stake in Everpower IPP Co., Ltd, which operates an LNG-fired combined cycle power generation project in Taiwan, to the Jack Wang Motors…

Power Generation
M&AAcquisition · Announced

Otovo acquires Sunsystem technology

Small-scale solar system services company Otovo plans to acquire commercial O&M brand SunSystem Technology for $770,000 in cash and $1.3 million in a three-year earn-out.

Commercial O&M (operations and maintenance)
M&AAcquisition · Announced

Solaria acquires Data center joint venture led by Telefónica and ACS

Spanish energy firm Solaria is reportedly in talks to acquire a stake in a data center joint venture led by Telefónica and ACS, valued at around €4 billion ($4.71bn).

Data centers
M&AAcquisition · Announced

Mars energy group acquires Solar Savings Direct

MARS Energy Group has acquired California-based Solar Savings Direct, doing business as Solar and Roof Direct, and Sequoia Roofing & Construction.

Solar
M&AAcquisition · Announced

Mars energy group acquires Sequoia Roofing & Construction

MARS Energy Group has acquired California-based Solar Savings Direct, doing business as Solar and Roof Direct, and Sequoia Roofing & Construction.

Roofing and Solar
M&AAcquisition · Completed

T1 Energy acquires Trina solar

Chinese solar photovoltaic firm Trina Solar sold its US facility to T1 Energy.

Solar Energy
M&AAcquisition · Completed

Headwater Energy acquires Arena renewables

Headwater Energy (“Headwater”) today announced it has completed the acquisition of Arena Renewables (“Arena”), a leading distributed generation solar and battery energy storage system…

Renewable Energy
FundingRefinancing

Gssg solar

Japan's maturing solar sector is entering a decisive post-FIT phase, as GSSG Solar and Voltaiyo KK secure refinancing for a 104 MW portfolio of legacy FIT projects with SBI Shinsei Bank…

Investors SBI Shinsei Bank
Solar Energy
M&AMerger · Completed

Mba polymers acquires Energenta

MBA Polymers has completed its merger with energenta AG, with the company's shareholders unanimously approving the transaction and exchanging their shares for new shares in the combined…

Plastics recycling and recovery technologies
ContractTechnology

Alphabet’s Google · client: Kairos power

Alphabet’s Google has signed an agreement with Kairos Power, aiming to bring online its first small modular reactor by 2030.

Nuclear Technology
M&AMerger · Completed

Eri acquires Itochu

March 2026: ERI and ITOCHU have jointly launched ERI Japan, a 50-50 joint venture focused on e-waste recycling in Japan.

Trading / investment
FundingTotal equity

Valar Atomics

Valar Atomics has now raised a total of $464M in total equity funding and is backed by Palmer Luckey and Shyam Sankar.

Investors Palmer Luckey, Shyam Sankar
M&AMerger · Announced

Trump Media & Technology Group Corp. NYSEDJT acquires Tae technologies

Last December, Trump Media & Technology Group Corp. NYSEDJT entered the nuclear fusion race after it agreed to buy California-based fusion startup TAE Technologies in a $6-billion…

ContractSupply

Neovolta · client: Luminia

In December 2025, NeoVolta and Luminia announced a strategic supply collaboration framework under which NeoVolta would receive a right of first refusal to supply battery energy storage…

Energy storage
ContractService

Tetra tech · client: Defense Logistics Agency

Tetra Tech, Inc. ... announced today that the Defense Logistics Agency (DLA) has awarded the Company a $14 million task order under the J6 Enterprise Technology Services (JETS) 2.0…

Defense
M&AAcquisition · Announced

Cypress creek renewables acquires Steel River

Cypress Creek Renewables , a solar and storage company, agreed to acquire Steel River solar and storage project from Swift Current Energy , an electric utility company, according to…

Solar and storage
ContractTechnology

Kepler GTL Technologies Inc. · client: Eco Innovation Group

Eco Innovation Group, Inc. (OTCID:ECOX) today provided a corporate update regarding its previously announced strategic transaction with Kepler GTL Technologies Inc.

Technology
FundingProject financing

Arevon Energy

Arevon Energy has secured $920m in financing for its Nighthawk Energy Storage Project, a 300MW/1.2 gigawatt-hour (GWh) facility being built in Poway, California, US.

Energy storage
Contract

Eco Innovation Group · client: Kepler GTL Technologies Inc.

The executed agreements include a Master Sales Agreement governing the overall structure of the transaction, a Stock Purchase Agreement providing for the transfer of voting control of…

Energy, Sustainable Aviation Fuel
ContractService

Costaldo Law Group P.C. · client: Eco Innovation Group

The Company has also retained Costaldo Law Group P.C., a corporate and securities law firm led by Evan J. Costaldo, Esq., as securities counsel to guide regulatory compliance and…

Legal Services / Corporate and Securities Law
M&AMerger · Pending

TMTG acquires Tae technologies

the closing of the previously announced pending merger transaction between TMTG and TAE.

Fusion Energy
ContractSupply

Recurrent energy · client: major Italian fashion group

Recurrent Energy a subsidiary of Canadian Solar Inc. (“Canadian Solar”) (NASDAQ: CSIQ), a leading global developer, owner, and operator of solar and energy storage assets, announced…

Renewable Energy
FundingSenior Secured Credit Facility

Sylmar Group

Manulife | Comvest Credit Partners, the private credit platform of Manulife Wealth & Asset Management, today announced that it is acting as administrative agent and sole lender on a $130…

Investors Manulife | Comvest Credit Partners
Water and wastewater services
FundingDirect Offering

Tigo energy

Tigo Energy, Inc. entered into definitive agreements with certain institutional investors for the purchase and sale of 5 million shares of common stock at a price of $3.00 per share,…

Renewable Energy

Environment companies in California, by funding and team

Few environment companies in California publish revenue, so this list compares what is on record instead: recorded equity funding, team size, revenue model, age and stage. The 50 companies below lead on recorded funding and team size among 1,516 active companies.

Showing 25 of 50

Developer of FRC nuclear fusion reactors

Nuclear energy
US$1.32bnSeries G · Jun 2025
303+13% 12 mo to Dec 2021LinkedIn · Oct 2026
Fee-for-service
28 yr1998
0none in 3 months · last posted Jan 2026

Provider of solar panels, solar panel kits, and related components

Solar energy
US$845.32mSeries E · Jan 2018
137-1% vs previous recordLinkedIn · Oct 2026
Physical commerce
21 yr2005
0none in 3 months

AI-powered energy management software optimizing renewable energy and storage portfolios

Solar energy
US$819.06mSeries G · Jul 2013
131-43% 12 mo to Dec 2022LinkedIn · Jul 2026
Physical commerce
20 yr2006
0none in 3 months

Developer of portable nuclear microreactors designed to replace diesel generators

Energy efficiency tech
US$517.96mSeries D · Dec 2025
587LinkedIn · Oct 2026
Physical commerce
7 yr2019
0none in 3 months

Developer of utility-scale wind and solar power projects

Solar energy
US$500.00mSeries B · Aug 2022
239+12% 12 mo to Dec 2022LinkedIn · Oct 2026
Fee-for-service
10 yr2016
0none in 3 months · last posted Jun 2026

Manufacturer of nuclear fission reactors

Nuclear energy
US$489.00mSeries B · Apr 2026
125LinkedIn · Jul 2026
E-commerce - product / Physical commerce
3 yr2023
0none in 3 months · last posted Mar 2026

Developer of technology pursuing commercialization of fusion energy production

Nuclear energy
US$450.00mSeries A · Feb 2026
48LinkedIn · Jul 2026
Physical commerce
2 yr2024
0none in 3 months

Provider of ethanol production solution from municipal solid waste

Waste & water management
US$347.93mSeries F · Jul 2022
129+52% 12 mo to Dec 2022recorded Dec 2022
Physical commerce
19 yr2007
0none in 3 months

Provider of solar energy services for residential

Solar energy
US$296.98mPE · May 2014
10,668+110% 12 mo to Dec 2022LinkedIn · Oct 2026
E-commerce - product / Physical commerce
19 yr2007
0none in 3 months

Solar panel warranty support now provided by SunPower

Solar energy
US$270.74mSeries D · Jun 2019
46-31% 12 mo to Dec 2013recorded Dec 2013
E-commerce - product / Physical commerce
26 yr2000
0none in 3 months

Developer of solar energy projects

Solar energy
US$200.00mSeries D · Dec 2024
20LinkedIn · Jul 2026
Fee-for-service
4 yr2022
0none in 3 months

Designer of solar power conversion and storage products

Solar energy
US$160.93mSeries D · Jan 2021
81+27% 12 mo to Dec 2022recorded Dec 2022
E-commerce - product / Physical commerce
19 yr2007
0none in 3 months · last posted Aug 2024

Provider of micro-sized nuclear reactors for remote off-grid

Nuclear energy
US$109.12mSeries B · Dec 2025
120LinkedIn · Jul 2026
Physical commerce
3 yr2023
0none in 3 months · last posted Jun 2026

Provider of portable power stations, solar generators, and home backup systems

Solar energy
US$104.00mSeries B · Jun 2021
684LinkedIn · Oct 2026
E-commerce - product / Physical commerce
9 yr2017
0none in 3 months · last posted Feb 2026

Developer of laser technology for commercial inertial fusion energy systems

Nuclear energy
US$100.36mSeries A · Jun 2024
165LinkedIn · Oct 2026
Physical commerce
5 yr2021
0none in 3 months

Nuclear energy company that is developing a novel, deeply buried, small modular reactor technology designed to provide a safe, clean, and efficient source of power

Nuclear energy
US$84.00mAngel · Feb 2026
68LinkedIn · Jul 2026
Physical commerce
3 yr2023
0none in 3 months

PACE financing provider

Green buildings
US$75.00mSeries B · Oct 2017
7-69% vs previous recordLinkedIn · Jul 2026
Commission on transaction / Fee-for-service
17 yr2009
—No postings tracked

Semiconductor technology provider offering licenses, services, and equipment for diverse markets

Solar energy
US$70.18mSeries C · Mar 2016
12LinkedIn · Jul 2026
Physical commerce
29 yr1997
0none in 3 months

Solar EPC

Solar energy
US$61.40mSeries C · Aug 2012
165+27% 12 mo to Dec 2022LinkedIn · Oct 2026
Not available
46 yr1980
0none in 3 months

Developer of solar and wind energy projects

Solar energy
US$61.00mSeries C · Jan 2024
12LinkedIn · Jul 2026
Fee-for-service
4 yr2022
0none in 3 months

Provider of nuclear waste storage and disposal services

Waste & water management
US$59.08mSeries B · Jul 2025
31-37% vs previous recordLinkedIn · Jul 2026
Physical commerce
10 yr2016
0none in 3 months

Manufactures PV modules

Solar energy
US$50.00mPE · Oct 2011
31-16% vs previous recordLinkedIn · Jul 2026
Physical commerce
17 yr2009
0none in 3 months

Financial advisory for solar projects development

Solar energy
US$45.02mSeries B · Sep 2020
72+14% vs previous recordLinkedIn · Jul 2026
Commission on transaction / Fee-for-service
9 yr2017
0none in 3 months · last posted Jul 2026

Provider of solar panel recycling services

Solar energy
US$42.93mSeries A · Feb 2023
79+30% vs previous recordLinkedIn · Jul 2026
Physical commerce
4 yr2022
0none in 3 months · last posted Feb 2026

Offers modern prefab homes and luxury modular houses

Green buildings
US$41.53mSeries B · Nov 2021
39+86% vs previous recordLinkedIn · Jul 2026
Fee-for-service
9 yr2017
0none in 3 months
50 of 1,516 companies shown here · the full list is on Radar
Fliar Radar

Explore all 1,516 environment companies in California on Radar

This page shows the top 50. Radar has the complete, filterable list with contacts and live company signals.

Open environment in California on Radar
  • Every company, not just 50All 1,516 environment companies in California, filterable by stage, funding, team size, revenue model and age.
  • Founders and decision-makersLeadership teams with roles and verified LinkedIn profiles, ready for outreach.
  • Live signalsFunding rounds, hiring, launches and M&A as they happen, with alerts on the companies you follow.
  • Save and exportBuild lists, compare companies side by side and export them from your Radar account.

Explore environment companies in California by what you are looking for

Find top environment companies in California for solar energy, waste and water management, green buildings, and wind power. Explore environment startups in California and companies hiring in environmental services.

7 ways to explore environment in California

Solar energy companiesWaste & water management companiesGreen building companiesWind energy companiesEnvironment startups in CaliforniaEnvironment companies hiring in California

Solar energy companies

Companies developing, installing, and operating solar energy systems.

  1. Solyndra

    Provider of solar panels, solar panel kits, and related components

    Solar energy
    See in list
  2. BrightSource Energy

    AI-powered energy management software optimizing renewable energy and storage portfolios

    Solar energy
    See in list
  3. Longroad Energy

    Developer of utility-scale wind and solar power projects

    Solar energy
    See in list
  4. Sunrun

    Provider of solar energy services for residential

    Solar energy
    See in list
  5. Solaria

    Solar panel warranty support now provided by SunPower

    Solar energy
    See in list

Waste & water management companies

Providers of waste treatment, recycling, and water management solutions.

  1. Fulcrum Bioenergy

    Provider of ethanol production solution from municipal solid waste

    Waste & water management
    See in list
  2. Deep Isolation

    Provider of nuclear waste storage and disposal services

    Waste & water management
    See in list
  3. Sierra Energy

    Provider of waste-to-energy solution

    Bioenergy
    See in list
  4. Hauler Hero

    Provider of waste recycling services

    Waste & water management
    See in list
  5. Trevi Systems

    Provider of desalination services

    Waste & water management
    See in list
337 companies in California

Green building companies

Companies improving buildings through sustainable design and energy efficiency.

  1. Aro Homes

    Provider of constructing carbon negative green building services

    Green buildings
    See in list
  2. Wynd Technologies

    Manufacturer of sensors detecting indoor air quality smoke and noise

    Consumer electronics e-commerce
    Website
  3. Integrative Charging

    Provider of turnkey electric vehicle charging solutions for property owners

    Green buildings
    Website
  4. FTR

    Developer of green building communities

    Green buildings
    Website
  5. plant construction

    Plant Construction provides pre-construction services, construction management, and general contracting services.

    Green buildings
    Website

Wind energy companies

Developers and operators of wind energy projects and equipment.

  1. Longroad Energy

    Developer of utility-scale wind and solar power projects

    Solar energy
    See in list
  2. Agile Energy

    Power industry advisory services focusing on strategic, commercial, and financial solutions

    Solar energy
    See in list
  3. WinDensity

    Manufactures wind turbines

    Wind energy
    See in list
  4. Champlin Windpower

    Developer of wind energy projects

    Wind energy
    Website
  5. Aikido Technologies

    Developer of innovative floating wind technologies for clean energy solutions

    Wind energy
    Website

Environment startups in California

Recently founded environment companies in California.

  1. Valar Atomics

    Manufacturer of nuclear fission reactors

    Nuclear energy
    See in list
  2. Inertia

    Developer of technology pursuing commercialization of fusion energy production

    Nuclear energy
    See in list
  3. AMPYR Energy USA

    Developer of solar energy projects

    Solar energy
    See in list
  4. Antares Industries

    Provider of micro-sized nuclear reactors for remote off-grid

    Nuclear energy
    See in list
  5. Xcimer

    Developer of laser technology for commercial inertial fusion energy systems

    Nuclear energy
    See in list
123 companies in California

Environment companies hiring in California

Environment companies in California with hiring activity.

  1. TAE Technologies

    Developer of FRC nuclear fusion reactors

    Nuclear energy
    See in list
  2. Longroad Energy

    Developer of utility-scale wind and solar power projects

    Solar energy
    See in list
  3. Valar Atomics

    Manufacturer of nuclear fission reactors

    Nuclear energy
    See in list
  4. Tigo

    Designer of solar power conversion and storage products

    Solar energy
    See in list
  5. Antares Industries

    Provider of micro-sized nuclear reactors for remote off-grid

    Nuclear energy
    See in list
29 companies in California

Public environment companies in California

Listed environment companies based in California.

  1. Sunrun

    Provider of solar energy services for residential

    Solar energy
    See in list
  2. Tigo

    Designer of solar power conversion and storage products

    Solar energy
    See in list
  3. Trina Solar

    Manufacturer of photovoltaic products, energy storage, system solutions, and digital services

    Solar energy
    See in list
  4. ECOtality

    Retailer of solar products, energy efficient products, and buying guides

    Ratings and review platforms
    See in list
  5. SolarMax Technology

    Residential solar solution developer

    Solar energy
    See in list
44 companies in California
Mobile reach

Top 10 environment apps from California

The most-installed Android apps published by environment companies headquartered in California — 462K installs between them. 31 companies on this page publish at least one app; each company (legal entity) appears once, with its most-installed app.

1 of 10
2

Tigo Energy Intelligence

by Tigo

Installs91K
Rating3.48528 ratings
Last updatedMay 2026
View on Google Play ↗
Tigo Energy Intelligence screenshot 1Tigo Energy Intelligence screenshot 2Tigo Energy Intelligence screenshot 3Tigo Energy Intelligence screenshot 4Tigo Energy Intelligence screenshot 5Tigo Energy Intelligence screenshot 6
3

PG&E Report It

by PG&E

Installs31K
Rating3.287 ratings
Last updatedMay 2026
View on Google Play ↗
PG&E Report It screenshot 1PG&E Report It screenshot 2PG&E Report It screenshot 3PG&E Report It screenshot 4PG&E Report It screenshot 5PG&E Report It screenshot 6
5

Valley Air

by Valley Air

Installs17K
Rating3.23102 ratings
Last updatedJul 2025
View on Google Play ↗
Valley Air screenshot 1Valley Air screenshot 2Valley Air screenshot 3Valley Air screenshot 4Valley Air screenshot 5Valley Air screenshot 6
9

AquaTru Water Purifier

by Aquatruwater

Installs10K
Rating2.0384 ratings
Last updatedMay 2026
View on Google Play ↗
AquaTru Water Purifier screenshot 1AquaTru Water Purifier screenshot 2AquaTru Water Purifier screenshot 3AquaTru Water Purifier screenshot 4AquaTru Water Purifier screenshot 5
RadarBrowse every environment company in California on RadarOpen the full list and use the App Downloads and App Growth filters to keep only companies with a mobile app. This rail shows only the ten most-installed.Browse on Radar
For investors and data teams

Put this intelligence into your own tools

The figures on this page come from Fliar’s company, funding, hiring and news data. Use it through the Investor Intelligence API and company data exports, or explore every company, founder and investor in Radar.

Capital & corporate activity

Environment funding and M&A across the United States

2,477 recorded equity rounds have gone to 14,676 environment companies in the United States — how much, at which stage, into which sub-sectors, from whom, and how California compares. Debt, IPO and grant rounds are excluded.

equity rounds, last 12 months42

US$13.16bn

equity rounds, last 24 months164

US$20.04bn

raised over five yearsUS$37.75bn

709 rounds in the United States

M&A deals, California70

last 24 months

Capital by year

Equity funding into environment in the United States

amount rounds
$1.7bn2018110
$1.2bn201991
$1.1bn202096
$4.5bn2021115
$6.1bn2022168
$3.0bn2023153
$4.5bn2024127
$7.0bn2025112
$13bn202634

Bars show US$ raised; the number under each year is equity rounds. 2026 is year to date. The peak year was 2025, with US$7.00bn across 112 rounds.

The funding ladder · five years

Rounds and typical cheque by stage

AngelUS$91.50m3 rounds · median US$45.75m
SeedUS$609.96m360 rounds · median US$1.00m
Series AUS$2.47bn153 rounds · median US$7.00m
Series BUS$5.32bn69 rounds · median US$21.56m
Series CUS$3.76bn38 rounds · median US$57.82m
Series D+US$23.02bn55 rounds · median US$200.00m
Private equityUS$2.48bn31 rounds · median US$150.00m
Where the money went · five years

Most-funded sub-sectors

Solar energyUS$11.40bn202 rounds · 150 companies
Air management servicesUS$11.27bn37 rounds · 23 companies
Nuclear energyUS$10.20bn101 rounds · 38 companies
Waste & water managementUS$1.45bn204 rounds · 140 companies
Wind energyUS$1.40bn40 rounds · 28 companies
Energy efficiency techUS$516.76m5 rounds · 1 companies
Air pollution management techUS$397.37m14 rounds · 8 companies
Corporate activity · last 24 months

M&A in California

53Acquisition
16Merger
1Undisclosed

Most active acquirers

  1. Mars energy group4
  2. Trump Media & Technology Group Corp. NYSEDJT4
  3. Tetra tech4
  4. Mirion technologies4
  5. Complete solaria3

Most acquired or merged

  1. Tae technologies7
  2. Kevala3
  3. Landsea homes3
  4. Trump media & technology group2
  5. WRA Holdings, Inc.2

Each deal appears in the events strip at the top of the page.

Go deeper in the environment landscape reports:

Environment Industry Landscape of the United States
Industry landscape report

Environment Industry Landscape of the United States

The financials above are one chapter. The full environment landscape of California maps the whole industry — every segment, the capital behind it, the talent market and where the next opportunities are.

  • Market map of every sub-sector
  • Funding & company formation by year
  • Revenue, profit & financial strength
  • Digital footprint: traffic, apps, releases
  • Hiring, skills & pay
  • Founders & leaders
  • News & sentiment
  • Where demand runs ahead of supply
Read the environment landscape of California

Environment funding in California

145 environment companies in California have recorded equity funding, US$8.06bn in total. Totals and round dates describe the historical record; they are not current valuations.

Founders and momentum in California

Meet the people behind environment companies in California. 467 of 1,516 companies list founders or leaders; where a public LinkedIn profile matches exactly, the expanded profile shows the photo, headline, location and education.

Explore California environment companies by sub-sector

The most common specialisations among environment companies in California. Open a company to see what it sells, who runs it and how far it has come.

Keep exploring environment in the United States and nearby markets.

Explore more lists: nearby cities and other sectors in California

439 more company lists you can search, plus the Radar directory pages for each place.

Environment in nearby cities

Environment in other US cities

Other sectors in California

Browse the Radar directory

Coming soon