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Energy Efficiency Startups

Updated October 2026

Companies in the energy efficiency sector developing innovative solutions and technologies.

Explore 412 recently funded energy efficiency companies with verified founder contact information and fundraising data.

Total Companies
412
Total Funding
$499.2M
Avg Funding
$20.0M
Global Reach
11
countries

Top Cities for Energy Efficiency

Denver
Antwerp
Gallen
Tokyo
Kowloon City
Mechelen

Recently Funded Companies

Export
Denver, United States

Xcimer Energy is an inertial fusion company offering laser-driven fusion to provide cheap, abundant, and carbon-free energy.

$100.0M raised
Sep 2026

Founder Contacts

41,000+ verified contacts

Antwerp, Belgium

Qpinch makes steam from industrial waste heat

$16.6M raised
Sep 2021

Founder Contacts

41,000+ verified contacts

Gallen, Germany

Smarli specializes in smart house solutions and provides a versatile system for both new building and retrofitting existing homes.

$2.5M raised
Sep 2026

Founder Contacts

41,000+ verified contacts

Tokyo, Japan

Helical Fusion is a startup company that aims to commercialize fusion energy using magnetic confinement of high-temperature plasmas.

$16.9M raised
Sep 2026

Founder Contacts

41,000+ verified contacts

Kowloon City, Hong Kong

I2Cool is a technology start-up that develops electricity-free cooling technologies based on passive radiative cooling.

$12.8M raised
Sep 2026

Founder Contacts

41,000+ verified contacts

Mechelen, Belgium

Octave provides battery energy storage systems and software for managing renewable energy, EV charging, and power use.

$11.6M raised
Sep 2026

Founder Contacts

41,000+ verified contacts

London, United Kingdom

The intelligence layer for modern business energy

$1.2M raised
Sep 2025

Founder Contacts

41,000+ verified contacts

Wysall, United Kingdom

GeoPura is a clean energy technology company that develops hydrogen-based power generation systems to replace diesel generators.

$29.4M raised
Sep 2024

Founder Contacts

41,000+ verified contacts

Vancouver, Canada

Daanaa’s proprietary semiconductor technology provides power transactions medium and modality free: wired or wireless in AC/DC modes.

$300K raised
Sep 2022

Founder Contacts

41,000+ verified contacts

Eresing, Germany

Reverion develops reversible and carbon-negative power plants using patented biogas technology for renewable energy.

$175.0M raised
Sep 2026

Founder Contacts

41,000+ verified contacts

Ankara, Turkey

SolarVis is a B2B SaaS company that provides white-label solutions to manage sustainable energy lead, sales, and design processes.

$310K raised
Sep 2023

Founder Contacts

41,000+ verified contacts

Houston, United States

Onvis is a company that offers energy related services.

$4.2M raised
Sep 2025

Founder Contacts

41,000+ verified contacts

Singapore, Singapore

EDP Renewables APAC is a Singaporean provider of solar and clean energy.

$22.6M raised
Sep 2025

Founder Contacts

41,000+ verified contacts

Chandler, United States

Elevation is a provider of residential solar, storage, energy efficiency, and energy intelligence technology.

$20.0M raised
Sep 2023

Founder Contacts

41,000+ verified contacts

Sunnyvale, United States

Mojave Energy Systems produces novel liquid desiccant systems for HVAC.

$19.0M raised
Sep 2026

Founder Contacts

41,000+ verified contacts

Beaverton, United States

Gyft Labs's energy solutions do not negatively impact existing ecosystems.

$4.5M raised
Sep 2021

Founder Contacts

41,000+ verified contacts

Madison, United States

Realta Fusion develops fusion energy technology for the production of industrial heat and power.

$9.5M raised
Sep 2026

Founder Contacts

41,000+ verified contacts

London, United Kingdom

Signol focuses on behavior change to reduce fuel consumption and carbon emissions in the aviation and shipping sectors.

$3.3M raised
Sep 2024

Founder Contacts

41,000+ verified contacts

Fairfield, United States

Horizon Energy Global offers oil and gas exploration and production services through carbon capture and sequestration projects.

$3.3M raised
Sep 2023

Founder Contacts

41,000+ verified contacts

Houston, United States

Vaulted Deep provides proven technology solutions for permanent carbon removal to promote local environmental and community health.

$35.0M raised
Sep 2026

Founder Contacts

41,000+ verified contacts

Manchester, United Kingdom

We create stylish home automation, IoT devices that save energy and improve comfort. Globally active through Ovon Home and Ovon Technology.

$45K raised
Sep 2021

Founder Contacts

41,000+ verified contacts

Nice, France

Qualisteo, is a company based in Nice (France) specialized in energy efficiency for industrial and tertiary sites

$5.4M raised
Sep 2023

Founder Contacts

41,000+ verified contacts

Berkeley, United States

Harvest Thermal develops a control system for home use that integrates heating, hot water, and cooling with thermal storage.

$2.0M raised
Sep 2024

Founder Contacts

41,000+ verified contacts

Chicago, United States

NETenergy is a thermal energy storage company that is creating a thermal battery designed to offset peak electricity load.

$2.0M raised
Sep 2024

Founder Contacts

41,000+ verified contacts

Kraków, Poland

Advanced Data Science analytics obtained from IoT sensors and external information sources, dedicated for Energy sector

$1.8M raised
Sep 2021

Founder Contacts

41,000+ verified contacts

Showing 1 to 25 of 412 companies

About the Energy Efficiency Startup Ecosystem

The energy efficiency sector is an active area of startup innovation and venture capital investment. Companies in this space are developing new technologies, platforms, and services that address evolving market needs and create new business opportunities.

Funding Trends in Energy Efficiency

Energy Efficiency companies raise capital across various funding stages, from early seed rounds to late-stage growth financing. Investor interest in this sector is driven by the size of the addressable market, the pace of technology adoption, and the potential for scalable business models.

Growth Outlook

The energy efficiency sector is expected to continue evolving as technology advances, market dynamics shift, and new opportunities emerge. Companies that demonstrate strong product-market fit, efficient growth, and clear competitive advantages are well-positioned to attract continued investment.

Energy Efficiency Funding Breakdown

Here is how funding is distributed among the 412 energy efficiency companies tracked in the VCBacked database.

Average Funding
$20.0M
Total Funding Tracked
$499.2M
Countries Represented
11

Distribution by Funding Stage

Other25 companies

Top Cities for Energy Efficiency

1.London
2 companies$4.5M
2.Houston
2 companies$39.2M
3.Denver
1 companies$100.0M
4.Antwerp
1 companies$16.6M
5.Gallen
1 companies$2.5M

Related Industries

Companies in the energy efficiency sector often overlap with or complement businesses in adjacent industries. Exploring related verticals can help you discover additional companies, identify partnership opportunities, and understand the broader competitive landscape.

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