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All investor lists > Cleantech
Explore cleantech VC firms, angel investors, and climate accelerators funding renewable energy, decarbonization, and sustainability technology. Discover investors across pre-seed, seed, and Series A who are backing the next wave of climate innovation.
Last update: July 1, 2026
List author: Lucas Roquilly
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Use code "OpenVC". Conditions apply.
Raising capital for a cleantech company comes with a different set of constraints than most venture-backed startups. Timelines are longer, capital requirements are higher, and progress is often measured in pilots, deployments, and regulatory milestones rather than pure revenue growth. That reality shapes how cleantech investors evaluate opportunities and which companies ultimately get funded.
This guide breaks down how cleantech venture capital works today. It covers the cleantech VCs that consistently deploy capital, the accelerators and angel networks that matter at the earliest stages, and how founders can approach investors in cleantech with clearer expectations and better targeting.
Cleantech investment has entered a period of renewed strategic focus following a period of recalibration after broader tech market contractions. Capital flows are increasingly concentrated on commercially viable technologies with clear pathways to deployment and revenue, particularly in areas such as electrification, energy storage, industrial decarbonization, and climate change related software.
Policy incentives, including infrastructure and climate legislation in major markets, continue to drive long-term visibility for cleantech founders and backers. These incentives (combined with increasing corporate commitments to net-zero targets and supply-chain sustainability requirements) are accelerating demand for solutions that address energy transition, carbon management, and resource optimization.
Looking forward, the cleantech category is expected to broaden beyond traditional hardware-centric approaches. Software-enabled efficiency platforms, climate data and analytics, and financing innovations that unlock deployment capital are gaining prominence. The intersection of capital discipline and climate impact gives rise to a generation of cleantech companies that are both mission-driven and risk-adjusted investment opportunities.
Cleantech venture capital is shaped by specialization and patience. Some firms exist purely to fund climate and energy innovation, while others are elite generalist VCs that consistently back cleantech once companies show real-world traction. The firms below are widely recognized by founders and investors as some of the most credible sources of capital for cleantech companies.
Backed by Bill Gates and a coalition of climate-focused operators, Breakthrough Energy Ventures invests in companies tackling fundamental climate and energy challenges. Their portfolio companies are from sectors such as power generation, manufacturing, agriculture, and carbon solutions, with a willingness to support technologies that take a decade or more to mature. Breakthrough is known for deep technical diligence and unusually patient capital, making them a fit for founders working on hard problems that do not follow standard venture timelines.
Energy Impact Partners sits at the intersection of venture capital and the utility world. Their LP base includes major energy and infrastructure companies, which gives portfolio startups direct access to customers and deployment partners. EIP is particularly active in grid modernization, electrification, energy software, and climate infrastructure, and is often involved once a product is ready to move from pilot to scaled deployment.
Founded by Chris Sacca, Lowercarbon Capital backs founders working on high-impact climate solutions, from carbon removal to clean energy to industrial decarbonization. The firm is comfortable investing early and often supports ambitious technical bets that other VCs may avoid. Lowercarbon’s portfolio reflects a broad view of climate innovation, with a bias toward companies that can materially reduce emissions at scale.
Congruent Ventures is a cleantech-focused venture capital fund that invests primarily at the seed and Series A stages. The firm has built a reputation for backing sustainability and energy transition startups early, then staying actively involved as companies mature. Congruent is frequently the first institutional investor for cleantech founders and is well regarded for its hands-on approach and sector-specific expertise.
With a singular focus on climate and energy, Prelude Ventures invests across software, hardware, and infrastructure-adjacent businesses. The firm looks for companies that combine technical credibility with a clear path to commercialization. Prelude often backs founders who understand their end markets deeply, especially in energy transition and climate resilience.
DCVC invests in deep tech and applied science companies, including many in cleantech, energy, and industrial systems. Their portfolio includes companies building defensible technology platforms rooted in physics, chemistry, and data science. DCVC is a strong fit for founders developing technically complex products that require investors willing to engage deeply with the science.
Built out of MIT, The Engine was designed to support what it calls “tough tech.” This includes cleantech companies with long R\&D cycles, significant capital needs, and complex regulatory or manufacturing paths. In addition to capital, The Engine provides infrastructure, lab space, and long-term support that traditional VCs often cannot offer.
Chrysalix Venture Capital focuses on industrial innovation and energy systems, often partnering with strategic corporate investors. The firm has deep roots in industrial and infrastructure markets, which makes it particularly relevant for cleantech companies selling into heavy industry, utilities, or global supply chains.
Capricorn Investment Group manages climate-focused funds that invest in sustainable energy, agriculture, and resource efficiency. The firm has been active in cleantech for over a decade and backs companies that align financial returns with environmental impact. Capricorn is often involved in later-stage or growth-oriented climate investments.
Climate Capital focuses on early-stage climate software and asset-light climate solutions. The firm is a strong fit for founders building tools that help enterprises measure, manage, or reduce emissions without heavy hardware or infrastructure requirements. Climate Capital frequently backs companies at the seed stage and supports them through early customer adoption.
Accelerators and incubators play a critical role in cleantech by helping startups bridge the gap between technical validation and real-world deployment. Many provide access to pilots, corporate partners, and non-dilutive capital that early-stage cleantech companies need to progress.
Elemental Excelerator works closely with governments, utilities, and large enterprises to help climate companies move into live deployments. The program is particularly valuable for startups that are past the lab stage and ready to prove their technology in the field.
One of the largest cleantech incubators globally, Greentown Labs supports startups with lab space, prototyping resources, and a broad corporate and investor network. Greentown is especially well known for supporting hardware, materials, and industrial climate companies.
Based in Berkeley, Cyclotron Road helps energy and climate technologies transition from academic research to commercial companies. The program is a strong fit for founders spinning technologies out of universities or national labs and navigating the early commercialization process.
The accelerator arm of The Engine supports climate tech startups building technically complex solutions with long timelines. Companies receive funding, mentorship, and access to specialized infrastructure designed for hard-tech and cleantech innovation.
Third Derivative is a global accelerator focused on scaling climate and energy technologies. The program connects startups with corporate partners, investors, and customers, helping founders move faster from pilot projects to commercial traction.
Angel capital in cleantech often comes from organized networks, former operators, and industry executives rather than individual generalist angels.
CEVG is an angel group that invests exclusively in early-stage clean energy and climate companies. The group is known for deep domain expertise and often acts as a company’s first institutional capital.
Investors Circle is a long-standing impact investing network that backs climate, sustainability, and energy startups. Its Cleantech Circle focuses on companies with measurable environmental outcomes alongside financial returns.
Green Angel Syndicate is a climate-focused angel network in the UK that invests globally. The group supports early-stage companies working on climate mitigation, nature-based solutions, and sustainable infrastructure.
Rockies Venture Club is an active Colorado angel network with a strong presence in cleantech and climate-related startups across the Mountain West. RVC often supports pre-seed and seed-stage companies.
Cleantech capital often overlaps with adjacent categories. You’ll find many relevant investors under:
Finding the right cleantech investors is less about volume and more about alignment. OpenVC helps founders identify investors in cleantech who are actively deploying capital across energy, climate, and industrial innovation.
You can filter for cleantech VCs by stage, sector focus, and check size, then build a focused outreach list instead of starting from scratch every time. From there, founders can request warm introductions, send pitch decks directly, and manage ongoing conversations inside OpenVC’s Fundraising CRM.
We built OpenVC to support complex raises where timelines are long, stakeholders are many, and momentum matters. If you are navigating cleantech venture capital, having everything in one place makes the process far more manageable.
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Founders raise with OpenVC because it is designed to cut through the noise and get founders in front of the right investors, fast. With built-in tools for CRM, analytics, and warm intros, it helps you stay organized and improve your chances of getting a reply.
OpenVC is for early-stage startup founders who want to raise capital efficiently. Find investors from dozens of industries including SaaS, AI, fintech, biotech, and more. Whether you’re pre-seed, seed, or Series A, OpenVC helps you find and pitch aligned investors without paying intro fees, aimlessly cold-emailing, or scraping databases.
To start pitching investors on OpenVC, create a free account and submit your pitch deck directly through our startup funding platform. Investors receive a unique link to view your deck, and you get analytics on who opens it and how long they spend on it. No cold emails, no guesswork. For more info, check out our complete guide to fundraising on OpenVC.
Absolutely, OpenVC is designed for early-stage fundraising. You’ll find thousands of angel investors, pre-seed VCs, accelerators, incubators, and family offices who are actively backing startups across sectors and geographies. Use OpenVC’s filters to narrow your search and find the right investors for your startup.
Some examples of startups that successfully secured funding through OpenVC include Mobly (2.5M seed), Paxum ($1.2M seed), and Laennec AI ($400k pre-seed). OpenVC startups have gone on to raise more than $1 billion from top venture capital firms like YC, Sequoia, Google Ventures, and M12.
OpenVC was created by Stephane Nasser and Lucas Roquilly—two founders building tools to make startup fundraising more transparent and accessible. We launched OpenVC to help founders find investors, get replies, and raise smarter. The platform is bootstrapped, community-driven, and built with a lot of heart.
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