Top 50 Renewable Energy Angel Investors (October 2026)

Portfolio highlights

• Optimus Technologies — Optimus Technologies is a clean energy technology company based in Pittsburgh, Pennsylvania. Optimus manufactures the Vector System, an advanced fuel system technology that enables diesel engines to operate on 100% biodiesel. Emissions reductions for heavy-duty fleet applications are challenging or impossible to achieve in a cost-effective mannerthrough other means. The Vector System integrates into existing operations to facilitate a seamless transition to low-carbon fuels.

Portfolio highlights

• Pilgrim — Pioneering a biologically enhanced future for humanity.
• Stack Health — Stack Health is the operating system for personalized health plans to accelerate the transition to coverage being owned by individuals instead of employers. Stack helps our members visualize their healthcare as a ‘stack’ of products that all come together in a seamless way to create a customized and comprehensive approach to healthcare. Stackpartners with employers to create a contribution strategy that migrates from the group health world's cost and complexity toward a solution that enables freedom, transparency, and efficiency.
• Thor Dynamics — Directed Energy Systems for Counter-Drone Defense

Portfolio highlights

• Optimus Technologies — Optimus Technologies is a clean energy technology company based in Pittsburgh, Pennsylvania. Optimus manufactures the Vector System, an advanced fuel system technology that enables diesel engines to operate on 100% biodiesel. Emissions reductions for heavy-duty fleet applications are challenging or impossible to achieve in a cost-effective mannerthrough other means. The Vector System integrates into existing operations to facilitate a seamless transition to low-carbon fuels.

Portfolio highlights

• Centivax — Centivax is a healthcare-based agency that provides biotechnology, pharmaceutical, medical device manufacturing, and therapeutic services.
• The Interaction Company of California — The proactive AI assistant on Apple Messages, WhatsApp, Telegram, and more. Texts like a human, really knows you, and integrates with your life in dozens of ways.
• SendCutSend — Online sheet metal fabrication service. Get custom parts delivered in just a few days. Upload STEP or DXF files for instant pricing!

Portfolio highlights

• Exowatt — Modular full-stack renewable energy solutions for commercial and industrial customers.
• Preventive — Preventive mission is to determine whether the newest generation of gene editing technologies can be used safely and responsibly to correct devastating genetic conditions for future children.
• Red Queen Bio — Red Queen Bio is an AI biosecurity company. Think of us as the cybersecurity layer for biology. AI is making it dramatically easier to design powerful new drugs and therapies, which is extraordinary news for medicine. But the same tools are also lowering the barrier for bad actors to engineer dangerous pathogens, and opening up an entirely new category of threats, including viruses designed to evade human immunity.Defense has to keep pace with offense.

Portfolio highlights

• Tandem PV — Discover the future of sustainable energy with Tandem PV, a leader in perovskite solar technology and innovative solar energy solutions.
• Wolf Games — We help media and brand partners turn passive audiences into active players through custom, hosted, measurable game experiences built from what you already own, hosted and run by us.
• Rock Rabbit — We make the rebate process quick, accurate, and efficient so contractors and homeowners can focus on their projects.

Portfolio highlights

• Koloma — Koloma is revolutionizing clean energy by harnessing naturally occurring hydrogen from deep within the Earth.
• TerraPower — Leading innovations in nuclear applications for reactor and storage technology, while advancing methods to transform the fight against cancer.
• Lucy Therapeutics — Lucy Therapeutics, a Boston-based biotech with a unifying mitochondrial platform, is developing small molecule treatments for neurological diseases.

Portfolio highlights

• Notte Group — A family run venture organization mainly focused over investment management and project planning within areas of energy, renewables, farming, agritech!
• AASAN Consultancy — AASAN Consultancy is a management consulting firm providing energy management and engineering services.Its primary focus is on cost reduction, energy consumption analysis, and evaluation, as well as future-oriented planning for the cost-saving strategies for the energy supply. The firm identifies the possibilities to reduce current energy billswithout any impact on the consumer's current quality, volumes, or safety standards.Ratilal M. Bavarva founded the firm in 2018 with its headquarters in Rajkot, Gujarat.
• Habaple Solar Technology Limited — An intertwine solar technology company with a next generation of 2.1 MW powerhouse grid base module system with an annual source of electricity generation. The project will be under the guideline of Ministry of New and Renewable Energy (MNRE), Deutsche Gesellschaft für Internationale Zusammenarbeit GmbH (GIZ), Ministry of Power.

Portfolio highlights

• Battery Pollution Technologies — Battery Pollution Technologies is establishing a national circular economy for lithium-ion batteries. Our comprehensive technology encompasses the entire lifecycle, from safe end-of-life management to eco-friendly repurposing and novel chemical recovery of critical battery materials.
• Dumaresq Solar Farm — Large Scale Solar Farm & Battery Storage Development based in northern NSW, Australia

Portfolio highlights

• Jack & Jill AI — Jack helps candidates find the perfect job and Jill helps companies find the perfect candidate.
• SimpleStudy — Learn smarter with revision notes, past papers, quizzes, and expert tools for major Irish academic exams. Join SimpleStudy Ireland and boost your grades today.
• Jentic — Jentic is a sovereign agent operating system. Your people and your agents work side by side, and the knowledge they create compounds into something you own.

Portfolio highlights

• WATTS BATTERY — Smart portable backup system for home and business. Compatible with solar panels. Member of #BCorp https://t.co/sXq41ld3Im

Portfolio highlights

• autarc — We supercharge installers with our OS to become heat pump champions
• Heimladen — Heimladen is a renewable energy source that drives human mobility. They offer a platform that acts as a real estate partner, controls the charging infrastructure, and takes care of project planning while keeping costs low, and enabling tenants.
• Greenflash — Greenflash places a premium on quality, efficiency, and client happiness. We collaborate with world-class partners to deliver you high-quality components and cutting-edge technologies. Our customized energy solutions are tailored to your specific needs and circumstances in order to get the best potential outcome for you.

Portfolio highlights

• June.ai — Discover June, a digital communication hub that replaces your email experience. June creates a new world for your existing email that gives you more control, interactivity and efficiency.
• Panthalassa — We're harnessing renewable energy in the open ocean and delivering it around the world. Engineered in Portland, Oregon.
• Factory — Factory is bringing autonomy to software engineering.

Portfolio highlights

• Pipe — Get up to the full annual value of your booked monthly and quarterly contracts. Scale your business without dilution or debt.
• Cache — Biomolecules are the next bits of the 21st century. So we're developing the first wet operating system for storing, accessing, and computing biomolecules at scale to make them widely accessible and useful. We're enabling the storage and access to the whole data universe—digital and biological—forever so that we don't have to deleteor dispose of anything ever again.
• Renaissance Fusion — Renaissance Fusion is a high-temperature superconductor and stellarator company.

Portfolio highlights

• Xeal — Xeal Energy provides the world's most advanced electric vehicle (EV) charging stations, designed especially for commercial, business & apartment use.
• WeaveGrid — WeaveGrid operates with utilities and owners of electric vehicles (EV) to allow and speed up transportation electrification. Using machine learning, optimization, and predictive analytics, the company's software solution solves several EV-grid integration challenges for utilities in a systems-oriented manner; helps integrate renewable energyresources on the grid; and saves utility customers' money on their bills.
• Distributed Energy Pte Ltd — We design, finance, build and manage solar and battery systems for businesses across India and Africa. You only pay us when you save.

Portfolio highlights

• Neocrete — Neocrete is a concrete manufacturing company that is involved in the manufacture of resilient and carbon-neutral concrete.
• Agros — Agros exist to make farming economically viable and environmentally sustainable. The company provides farmers with carbon-reducing and income-increasing products and services, from input to market. Their unique ecosystem approach aggregates different low-carbon technologies, bundled with affordable finance, insurance, advisory and market access.Agros’ mission is to double the income of millions of farmers while reducing 100 megatons of annual carbon emissions.
• Lhoopa — Making homeownership achievable for every Filipino family.

Portfolio highlights

• Zeit AI — Zeit AI, founded by former Palantir engineers, generates a structured data base atop your tabular data files which you can query using natural language. For example, you suspect an efficiency in your organisation and you have a bunch of data files, instead of reading through all of them one by one in excel, you explore them in Zeit AI. Theycurrently offer a two-week pilot program where their engineers develop tailored solutions for data challenges involving CSV, Excel, or PDF files.
• Mantic — Mantic is a world-class technical team on a mission to solve the next AI grand challenge: predicting global events with superhuman accuracy, and deploying this capability to power radically improved decision-making in business and government.
• Pilgrim — Pioneering a biologically enhanced future for humanity.

Portfolio highlights

• Voltfang — We integrate used electric car batteries into a battery storage system and thus build up a decentralized storage network.
• Heimladen — Heimladen is a renewable energy source that drives human mobility. They offer a platform that acts as a real estate partner, controls the charging infrastructure, and takes care of project planning while keeping costs low, and enabling tenants.
• Greenflash — Greenflash places a premium on quality, efficiency, and client happiness. We collaborate with world-class partners to deliver you high-quality components and cutting-edge technologies. Our customized energy solutions are tailored to your specific needs and circumstances in order to get the best potential outcome for you.

Portfolio highlights

• Praan — Praan builds the world's most advanced air purification technologies for commercial and industrial applications.
• Prevently — Prevently is a website that provides consumers with physician-reviewed health articles, physician-approved health products, health apps, and telemedicine consultations. These services centralize around an online patient profile that integrates data utilizing APIs from multiple personal health tracking devices.

Portfolio highlights

• Granola — The AI notepad for back-to-back meetings. Notes, actions and memory. Without a meeting bot.
• Neptyne — Neptyne is making spreadsheets programmable
• Voltfang — We integrate used electric car batteries into a battery storage system and thus build up a decentralized storage network.

Portfolio highlights

• Asepha — Asepha is an AI clinical decision support (CDS) tool to help healthcare professionals make faster clinical decisions.
• ORA Technologies — E-Commerce, Super App
• THIRUMALS PAPER ARIZONA PVT. LTD. — TRADING PLATFORM OF PULP , PAPER & PACKAGING

Portfolio highlights

• Groccery store — Groccery store is a local Groccery store based in Hlotse, Leribe, Lesotho, designed to address a key challenge in the community
• Excel And Impact Agro — Excel And Impact Agro aims to tackle the chronic shortage of vegetable production in Côte d'Ivoire.
• Mercy Community School — Mercy Community School is a community-driven education initiative based in Linda Compound, Lusaka, Zambia.

Portfolio highlights

• Mast Reforestation — No-cost reforestation for post-wildfire burned acreage for landowners and foresters, funded by carbon removal credits.
• Sugarlogix — A precise reflection of human milk to provide the best nutrition for babies
• Mast Reforestation — No-cost reforestation for post-wildfire burned acreage for landowners and foresters, funded by carbon removal credits.

Portfolio highlights

• Montamo — Montamo trains lateral entrants with standardized methods. We rely on both our on-site academy and our digital learning software.
• Graswald AI — Graswald engages in the creation of natural and digital 3D worlds for the entertainment industry.
• DEALCIRCLE — DealCircle is a digital M&A solution and partner of hundreds of M&A advisors. We support in identifying buyers and addressing the market. This provides investors access to a comprehensive deal flow of relevant projects.

Portfolio highlights

• TransCrypts — We all have that file box where we throw all our important documents. Our goal at TransCrypts is to make that box digital and have all the documents secured through the blockchain. We currently offer industry leading privacy and security standards on our file storage and sharing platform and have solutions for individuals all the way to enterprises.
• AtomBeam — Atombeam Technologies is a software company building two AI platforms. Neurpac applies machine learning and advanced mathematics to compact and encrypt data in real time, reducing data volume and latency across transport-agnostic deployments. PCM (Persistent Cognitive Machine) is a geometric AI reasoning engine that reasons from mathematicalstructure rather than pattern-matching, enabling private, low-cost AI that runs behind the enterprise firewall.The company serves enterprise, government, and defense customers, with nearly 600 patents filed, eight active U.S. Department of War programs, an active DARPA engagement, and a Cooperative Research and Development Agreement (CRADA) with NIWC Pacific. Partners include DXC, Oracle, Ericsson, HPE, Viasat, and Trilliant.
• Pops Diabetes Care — If you are an employer, caregiver, or just someone who wants an easy diabetes management system, Click here to learn how we can help!

Portfolio highlights

• Kavaken — Renewables asset management AI agents that can work on operational issues from identification through investigation, action and verified resolution.

Portfolio highlights

• MaxFense — MaxFense is a company that focuses on enhancing the security of the internet through their ethical products. Primary among their offerings is the MaxFense Endpoint Security, which enables clients to check, prevent, detect, and respond to potential information security threats, regardless of whether they originate from inside or outside theorganization. This approach aligns with contemporary security standards that have increasingly recognized the importance of robust endpoint security in the face of diversified threat vectors.
• zymtrace — Powering Efficient AI: A continuous profiling platform for CPU and GPU workloads, that provides actionable insights to optimize perf & debug faster
• Borobotics — Our autonomous drilling robot helps homeowners to switch from grey energy sources to geothermal heating systems. With an earth-worm-like drilling robot for geothermal probes, Borobotics accelerate the heat transition for the net zero goals.

Portfolio highlights

• RootWave — RootWave is an electronics company that develops tools that kill weeds it enables farmers to control weeds on their farm. Its technology is an alternative substitute for herbicides and other weed control chemicals. The company was founded in 2012 and headquartered in Warwickshire, United Kingdom.
• Ecolectro — Ecolectro is solving the biggest challenges in making Green Hydrogen. Our alkaline ion-exchange membranes and polymers make clean fuel and decarbonize industry.
• Sniffer Robotics — Comprehensive methane emissions detection and quantification, advanced imagery and analytics; Sniffer Robotics provides advanced solutions that benefit the environment.

Portfolio highlights

• Kavaken — Renewables asset management AI agents that can work on operational issues from identification through investigation, action and verified resolution.

Portfolio highlights

• Unitary — We detect harmful content with context-aware AI to keep brands and platforms safe online.
• Cordless — Bridging the gap between voice and text
• Fabric — Fabric is an AI-powered workspace and file manager for people and groups.Fabric is a self-organizing multiplayer workspace.

Portfolio highlights

• Heliogen — Heliogen is a renewable energy technology company unlocking the power of sunlight to replace fossil fuels.
• Sienza Energy — Sienza Energy is developing a radical new approach to design and manufacture batteries. The company’s revolutionary strategy is based on a 3D nanotechnology electrode structure that takes advantage of advances in multiple fields over the last decade, providing an approach to battery design that is unique in the industry. By combining these advancesin an innovative way, Sienza can drastically improve the batteries’ energy and power densities — all with the goal of simultaneously reducing the overall battery costs. With this new approach, Sienza Energy can provide even more capability in a range of products, from smart devices to electric vehicles.
• Alyssum Therapeutics — Alyssum Therapeutics is a biotechnology company that focuses on developing next-generation immunotherapies to modulate B cells.

Portfolio highlights

• Praan — Praan builds the world's most advanced air purification technologies for commercial and industrial applications.

Portfolio highlights

• LastSwab — LastSwab launched May 2019 through the crowdfunding platform Kickstarter. At $16 a swab, LastSwab is meant to last at least 1,000 uses and is the easy-to-clean, reusable alternative to the abundant waste caused by single-use swabs around the globe. The tip of the swab is made from medical silicone and nylon and comes in a biodegradable case made ofa corn-based material. LastSwab can be easily cleaned using soap and water and is also dishwasher safe. It comes in a standard swab for cleaning and a pointed swab for makeup application. Be the change and #SwabYourHabits.
• LastObject — LastObject is a Danish manufacturing company, based in Copenhagen that sells sustainable products online and in retail globally. Having been launched in 2016, it launches new products through crowdfunding campaigns on Kickstarter and Indiegogo. The company is best known for producing LastSwab, a reusable cotton swab.

Portfolio highlights

• Nova Pangaea Technologies — NPT is a cleantech company that has developed a revolutionary process technology called REFNOVA. REFNOVA allows customers to converts non-food plant residues into sustainable products such as biochar, activated carbon, biofuel, biopolymers and biochemicals. Our products help customers replace fossil based products and enable decarbonisation.

Portfolio highlights

• Tornado — Digest information from thousands of public filings and your own documents with a versatile AI analyst, plus the reliability of full source attribution.
• Wonder — Introducing a new kind of home dining experience. Currently available in areas of New Jersey.
• Focused Energy — Focused is the leading Laser Fusion company pursuing the most promising path to clean, limitless fusion power... unlocking civilization's next great chapter of growth.

Portfolio highlights

• Praan — Praan builds the world's most advanced air purification technologies for commercial and industrial applications.
• Styledotme — Mirrar is a Augmented Reality (AR) SaaS platform from Styledotme which is the world's first Real time AR platform for Jewellery shopping.
• Trulymadly — Truly Madly is one of the best matchmaking app in India connecting singles across the country. Make friends, meet new people, or find your forever with the Top Dating App Online by Truly Madly.

Portfolio highlights

• Arcadia — Arcadia is the energy intelligence platform for businesses. We replace fragmented tools and manual workflows with one platform to pay utility bills, buy energy, and advance sustainability.

Portfolio highlights

• Ware — Ware deploys autonomous, self-flying drones—combined with machine learning—inside warehouses to automate their inventory tracking. Designed to solve some of the $1.9 trillion warehousing industry’s most pressing issues, Ware’s product helps their customers operate more efficiently. A partner of Skydio and funded by Bloomberg Beta, Ware works withthe world’s largest 3PL’s and global brands to improve their accuracy, workflows, and save money.
• Radiant — Clean. Portable. Safe. Energy
• Replenysh — Replenysh is a set of tools for communities and companies to build circularity in days, not years.

Portfolio highlights

• Arro — Discover the shared daily operating system that helps you get more from life and work. Get to Day Zero together.
• SPOKE — Music and lyricism-led mindfulness, aimed at helping the world's most creative minds feel at ease.
• Wax Poetics — Rare memorabilia. Timeless stories. Since 2001.

Portfolio highlights

• ecco — Tired of scrolling endlessly? ecco helps you find your next binge in seconds.
• D'Amelio Brands — The official home of the D'Amelio family: the family, their ventures, videos, and how to get in touch.
• D'Amelio family — The D'Amelio family is operating as a family investment firm.

Portfolio highlights

• Terviva — TerViva partners with growers to raise organic pongamia trees, a legume tree crop that produces large quantities of alternative protein and vegetable oil.
• Overstory — Overstory combines AI and advanced satellite imagery to help electric utilities pinpoint and prioritize vegetation risks before they materialize. With Overstory's vegetation intelligence, transmission and distribution operators can make smarter decisions about the vegetation around their power corridors, optimizing resources and improvingoperational efficiency. This helps prevent outages, reduce wildfire risks, and accelerate the transition to a safer, more resilient grid.
• Humanitas Technologies — Humanitas is reimagining the supply chain of social care for the AI era. We're building AI-powered tools to empower Nonprofit professionals. Try the Humanitas AI Assistant for free to see how you can save time so you can increase your impacts.

Portfolio highlights

• Cloobot Inc — Cloobot X: Your Premier Software Implementation transforms your vision into reality with our state-of-the-art software implementation studio. Leveraging cutting-edge AI technology, our expert team delivers rapid, efficient, and innovative solutions tailored to your unique business needs.
• Tokenise — Tokenise acts as a data layer for web3 projects and their tokens. We help founders build their tokens simply, mint/launch their tokens on-chain and then manage their tokens in one place. Tokenise enables founders to curate rich data rooms that make it easier for investors to get onboard. We empower community with unprecedented insights andaccessibility into their favourite projects and their tokens.
• Bloodstock Advantage — Stealth

Portfolio highlights

• Leadoptik — Leadoptik is a California-based company is currently operating in stealth mode.
• Modality.AI — Modality.ai is an AI-powered platform that detects health conditions using conversational AI. Through dialogue and video, Modality.AI interacts conversationally with the patient to provide health assessment anywhere, anytime. Its system analyzes multimodal data which allows continuous screening and assessing of patients’ health.
• Gray Oncology Solutions — Gray Oncology Solution is a healthcare enterprise software company that commercializes GrayOS, the operating system for oncology.

Portfolio highlights

• ClimateAI — Build climate resilience with accurate insights and actionable recommendations that will give you a competitive edge.
• WeaveGrid — WeaveGrid operates with utilities and owners of electric vehicles (EV) to allow and speed up transportation electrification. Using machine learning, optimization, and predictive analytics, the company's software solution solves several EV-grid integration challenges for utilities in a systems-oriented manner; helps integrate renewable energyresources on the grid; and saves utility customers' money on their bills.
• The Happy Home Company — The Happy Home Company is your Personal Home Manager. Managing your home is expensive, complicated, and time consuming. They solve this problem by connect homeowners with an affordable Personal Home Manager, who is supported by powerful technology, and a trusted service network

Portfolio highlights

• NewLimit — NewLimit is extending human healthspan by unlocking regenerative potential.
• Rivan Industries — Rivan Industries designs and builds modular, vertically integrated, synthetic fuel plants.
• Flow Engineering — Requirements management, made collaborative

Portfolio highlights

• Balio — Personal Finance Manager and Investing
• Rauda AI — Rauda is an artificial intelligence platform specialized in automating customer service with the best customer experience. Take a quantum leap in productivity, reduce costs and improve customer satisfaction with the power of generative artificial intelligence.
• Solfy — Solfy is a Marketplace for self-consumption of solar energy.

Portfolio highlights

• Baseten — Baseten is the ML Application Builder for data science teams. Ship full-stack apps in minutes. No frontend, backend, or infrastructure knowledge required.
• Craftwork — Craftwork is a modern general contracting company that uses technology to simplify repair and renovation projects for homeowners.
• Mainframe — Mainframe is a technology company pioneering the future of human-computer interaction through AI-driven tools. The company’s mission is to redefine productivity and workflow automation by creating intuitive platforms that bridge the gap between humans and intelligent agents.Mainframe’s debut product, Cobot, is a generative AI assistant thatanticipates user needs, streamlines tasks, and transforms the way individuals and teams interact with technology. Designed to feel more like collaborating with a human than using an app, Cobot empowers users to focus on impactful work while AI handles the rest.Founded in 2024, Mainframe is supported by top-tier investors and built by a distributed team of industry-leading talent from across the U.S., Canada, and Europe. Mainframe’s vision is to create seamless, intelligent software that reshapes how people work and interact with computers in the 21st century.

Portfolio highlights

• Giza — Streamline blockchain complexity through autonomous agents.
• Twin — Agentic AI, made actionable.
• Usual — Usual Labs operates as a decentralized finance(DeFi) protocol.

Portfolio highlights

• XBOW — XBOW operates autonomously, carrying out commands and analyzing the results to achieve higher-level objectives.
• Julius AI — Julius is a powerful AI data analyst that helps you analyze and visualize your data. Chat with your data, create graphs, build forecasting models, and more.
• Artificial Intelligence Underwriting Company — AIUC certifies and insures AI agents to unlock secure adoption.

Portfolio highlights

• Splitfy — Splitfy is the perfect app to collect money from your plans Group.
• Solfy — Solfy is a Marketplace for self-consumption of solar energy.
• Housfy — Housfy develops a digital platform designed to sell flats and houses between private individuals. The company's digital platform eliminates intermediation in the sale of houses, offering all the necessary tools for sellers and buyers to connect directly online, enabling home buyers and sellers to avoid traditional agencies and save brokeragefees.