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Energy Efficiency Startups

Updated July 2026

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

Explore 410 recently funded energy efficiency companies with verified founder contact information and fundraising data.

Total Companies
410
Total Funding
$4.1B
Avg Funding
$165.6M
Global Reach
11
countries

Top Cities for Energy Efficiency

Eindhoven
Raleigh
Portland
Temecula
Springfield
Sydney

Recently Funded Companies

Export
Eindhoven, The Netherlands

Incooling designs and develops two-phase cooling system solutions for data centers.

$3.8M raised
Jan 2023

Founder Contacts

30,000+ verified contacts

Raleigh, United States

Ndustrial offers analytical engines that help businesses control production, improve energy efficiency, and eliminate waste.

Jan 2025

Founder Contacts

30,000+ verified contacts

Portland, United States

We democratize Facility Management for Priority Populations.

Jan 2023

Founder Contacts

30,000+ verified contacts

Temecula, United States

Hydrogen fuel cell company with emissions reduction solutions for internal combustion engines.

$10.0M raised
Jan 2025

Founder Contacts

30,000+ verified contacts

Springfield, United States

VeriWatt is a solar energy installation company that maximizes the grid’s performance, cuts costs, and saves energy.

$1.2M raised
Dec 2022

Founder Contacts

30,000+ verified contacts

Sydney, Australia

Leveraging EVs and distributed energy resources to accelerate the energy transition.

$3.3M raised
Dec 2025

Founder Contacts

30,000+ verified contacts

Itzehoe, Germany

Innovative cells, High performance batteries, Lithium ion, cells, Automotive cells, Aviation cells, High Si cells, battery technology

$63.3M raised
Dec 2022

Founder Contacts

30,000+ verified contacts

Mount Pleasant Mills, United States

WATT Fuel Cell is a developer and manufacturer of solid oxide fuel cell stacks.

$82.3M raised
Dec 2022

Founder Contacts

30,000+ verified contacts

London, United Kingdom

tem is building the new transactions infrastructure for a modern energy market to provide universal access to the lowest-cost electricity.

$75.0M raised
Jan 2026

Founder Contacts

30,000+ verified contacts

Oak Ridge, United States

Standard Nuclear manufactures advanced nuclear fuel for next-generation reactors and high-temperature applications.

$140.0M raised
Jan 2026

Founder Contacts

30,000+ verified contacts

Seville, Spain

COX Group provides solutions for development and management of water resources as well as services for energy generation and transmission.

$2.6B raised
Jan 2026

Founder Contacts

30,000+ verified contacts

Tallinn, Estonia

R8tech take your building tech.management to the next generation by adding artificial intelligence on top of the existing automation system.

Dec 2023

Founder Contacts

30,000+ verified contacts

Guatemala City, Guatemala

Lowering energy costs for the telecom industry in emerging markets, while creating a greener more connected future!

$3.2M raised
Dec 2023

Founder Contacts

30,000+ verified contacts

Remscheid, Germany

Very High Temperature Heat Pumps (VHTHP) for hIgh efficient and deep de-carbonisation of industrial heating processes.

$6.8M raised
Jan 2022

Founder Contacts

30,000+ verified contacts

Menlo Park, United States

An affordable electric vechile and energy platfrom for commercial properties

Dec 2025

Founder Contacts

30,000+ verified contacts

Milan, Italy

Chiron Energy is a solar energy company that develops, invests, and manages platforms in the renewable energy sector.

$6.9M raised
Dec 2024

Founder Contacts

30,000+ verified contacts

Catania, Italy

3Sun is an energy management company that specializes in designing photovoltaic solutions for large-scale industries and roof application.

$608.0M raised
Jan 2024

Founder Contacts

30,000+ verified contacts

Collado-villalba, Spain

IEQSY is an energy-efficiency system that combines various approaches to enhance the installation's electrical quality.

$10.7M raised
Dec 2022

Founder Contacts

30,000+ verified contacts

London, United Kingdom

Octopus Energy is a clean energy technology company that provides green energy solutions.

$320.0M raised
Dec 2025

Founder Contacts

30,000+ verified contacts

Bologna, Italy

SaaS platform that simplifies real estate buying and selling.

$480K raised
Dec 2022

Founder Contacts

30,000+ verified contacts

Dunedin, United States

Maximize, Save, Conserve. IoT, Energy Management and Sustainable Consumption of Energy & Resources.

$7.5M raised
Dec 2022

Founder Contacts

30,000+ verified contacts

Via Di Mezzo Di Sopra, Italy

NextChem develops energy transition solutions for industries through sustainable technology.

$128.3M raised
Jan 2025

Founder Contacts

30,000+ verified contacts

Gibraltar, Gibraltar

ENG8 is a company that has developed a catalysed fusion (LENR), renewable energy technology called the EnergiCell®.

$2.5M raised
Jan 2024

Founder Contacts

30,000+ verified contacts

Gros Islet, Saint Lucia

EcoCarib is a Caribbean based green energy services company which specializes in solar renewable energy and electric vehicle charging

$1.0M raised
Dec 2024

Founder Contacts

30,000+ verified contacts

Kennerdell, United States

Stronghold Digital Mining operates a power generation facility that converts waste coal used to mine bitcoin and other cryptocurrencies.

$15.0M raised
Dec 2023

Founder Contacts

30,000+ verified contacts

Showing 301 to 325 of 410 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 410 energy efficiency companies tracked in the VCBacked database.

Average Funding
$165.6M
Total Funding Tracked
$4.1B
Countries Represented
11

Distribution by Funding Stage

Other25 companies

Top Cities for Energy Efficiency

1.London
2 companies$395.0M
2.Eindhoven
1 companies$3.8M
3.Raleigh
1 companiesUndisclosed
4.Portland
1 companiesUndisclosed
5.Temecula
1 companies$10.0M

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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410 Energy Efficiency Startups (2026) — Recently Funded Companies, Investors & Rounds | VCBacked