Top CleanTech Startups of July 2023

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The world is increasingly recognizing the importance of sustainable and environmentally-friendly solutions, and CleanTech startups are at the forefront of this movement.

CleanTech, short for clean technology, encompasses a wide range of startups that focus on developing innovative and eco-friendly solutions to address environmental challenges.

In this article, we will explore some of the best CleanTech startups that are leading the way in sustainability, renewable energy, waste reduction, and more, as they contribute to building a greener and more sustainable future.

Also, check out our list of the top startups of 2023.

Top CleanTech Startups of July 2023

SolarWindow Technologies


SolarWindow Technologies is a tech startup located in Scottsdale, Arizona, USA. The company was founded in the year 1998. Until now, information on their total raised money seems to be undisclosed or not publically available.

SolarWindow Technologies is dedicated to developing innovative and eco-friendly energy-generating solutions. It is known for creating a first-of-its-kind technology that converts natural and artificial light into electricity, integrating transparent solar panels into glass windows. This unique and inventive approach makes the company standout as it can potentially turn skyscrapers and other large-scale buildings into vertical power generators.

Bloom Energy

Bloom Energy

Bloom Energy is located in Sunnyvale, California, United States. The company was founded in the year 2001. According to reports, Bloom Energy has successfully raised an equity funding amount of approximately $1.2 billion.

Bloom Energy is a public company that provides clean, reliable, on-site electric power to customers from globally recognized companies to small businesses and homes. The core product, known as Bloom Energy Server, utilizes a unique kind of fuel cell that transforms fuel into electricity using an electrochemical process, which results in cleaner and more resilient energy. The company’s mission is to make clean, reliable, and affordable energy for everyone in the world to help tackle climate change.

Solid Power

Solid Power

Solid Power is a startup company located in Louisville, Colorado, USA. The company was founded in the year 2012. As of my most recent information, Solid Power raised about $130 million in a Series B funding round in May 2021.

Solid Power is an industry-leading producer of all-solid-state batteries for electric vehicles and mobile power markets. The company’s revolutionary battery technology improves upon traditional liquid-electrolyte designs by replacing the liquid electrolyte with a solid ion-conductive material, dramatically increasing energy and safety. The company is interested in pushing new boundaries in terms of energy efficiency, cost-effectiveness, and performance, making it a key player in the advancement of clean energy solutions.

Sila Nanotechnologies

Sila Nanotechnologies

Sila Nanotechnologies, Inc., is a startup located in Alameda, California, USA. Founded in 2011, it primarily focuses on developing and manufacturing materials that set a new standard for batteries.

By 2021, Sila Nanotechnologies raised up to $925 million. This significant financial backing has accelerated their pace of innovation and expansion even further.

The company is at the forefront of breakthrough battery technology with their proprietary silicon-dominant anode materials, which replace conventional graphite electrodes and deliver significantly higher energy density for batteries. They specialize in revolutionizing the next-generation of battery-powered devices by providing safer, denser, and cheaper alternatives. This innovation enhances the potential of electric vehicles and consumer electronics, promises longer-lasting power, quicker charges, and a longer overall lifespan.

Sila Nanotechnologies collaborates with leading automotive OEMs and battery manufacturers to bring better batteries to markets globally, demonstrating promising prospects for the future of energy storage solutions.



SunPower Corporation is a leading solar technology and energy services provider, located in San Jose, California, United States. The company was founded in 1985 by Dr. Richard Swanson.

As a publicly-listed company on the NASDAQ (SPWR), SunPower’s funding isn’t measured in regular funding rounds in the same way that it typically is for startups. However, it’s worth mentioning that they have generated billions of dollars in revenue over their decades of operation.

SunPower designs, manufactures, and delivers high-performance solar electric systems worldwide for residential, commercial, and utility-scale power plant customers. Their solar solutions are crafted with the highest-efficiency solar cells on the market, including the X-Series and E-Series panels. The company’s mission is to change the way our world is powered by making solar power accessible to everyone and they’re committed to providing the highest standard of clean energy solutions. They also provide services including installation, monitoring, and maintenance, and also leasing of solar power systems.

First Solar

First Solar

First Solar Inc. is a leading global provider of comprehensive photovoltaic (PV) solar energy solutions. Established in 1999, the company has been quite influential in the renewable energy sector. The firm is headquartered in Tempe, Arizona, United States.

As for its funding, First Solar went public in 2006 and raised approximately $400 million through its initial public offering. However, there might be more recent funding or investments not publicly disclosed.

First Solar specializes in photovoltaic (PV) solar energy solutions, with advanced PV modules manufactured using a proprietary thin film semiconductor technology. They are committed to leading the world’s sustainable energy future, with the mission of powerfully impacting the world by enabling a world run entirely on sunshine. First Solar carries out a vertically-integrated approach, handling all aspects from manufacturing the solar modules to developing, designing, constructing, operating, and maintaining the solar power plant systems. As demonstrated by their economically viable and increasingly larger solar projects, their innovative technology and approach have been ground-breaking in the PV solar section.



EnviroMission is an Australia-based renewable energy company that was founded in the year 2001. The exact amount of money raised by the company isn’t explicitly available. However, according to the information from public sources, it had several rounds of fundraising.

EnviroMission operates in the environmental sector, with a primary focus on sustainable technology. Specifically, they are widely recognized for their innovative Solar Tower technology—a unique kind of solar thermal power plant. The principle of their work is based on the “solar updraft” concept, where air heated by the sun in a large greenhouse-like structure at the bottom ascends through a tall tower to drive turbines and generate electricity. It’s an incredibly promising concept with the potential to revolutionize renewable energy.

Frequently Asked Questions

What is CleanTech?

CleanTech refers to the application of technology and innovation to develop environmentally-friendly and sustainable solutions that address pressing environmental issues. These startups aim to reduce carbon emissions, promote renewable energy, conserve resources, and create a more sustainable world.

What are the main areas of focus for CleanTech startups?

CleanTech startups focus on various areas, including:

  • Renewable Energy: Developing and implementing clean and sustainable energy sources like solar, wind, and hydroelectric power.
  • Waste Reduction: Innovating solutions to reduce waste generation, promote recycling, and implement circular economy practices.
  • Energy Efficiency: Creating technologies and systems to optimize energy use and reduce consumption in various sectors.
  • Sustainable Transportation: Developing electric vehicles, efficient transportation systems, and alternative fuels to reduce carbon emissions.

What impact do CleanTech startups have on the environment?

CleanTech startups play a crucial role in mitigating the impacts of climate change and environmental degradation. By introducing sustainable practices and technologies, they contribute to reducing greenhouse gas emissions, conserving natural resources, and promoting a cleaner and healthier planet.

How do CleanTech startups contribute to renewable energy?

CleanTech startups contribute to renewable energy by developing and implementing technologies that harness energy from renewable sources like solar, wind, and hydroelectric power. These startups drive the transition towards a more sustainable energy future.

What role do CleanTech startups play in waste reduction?

CleanTech startups actively tackle waste reduction by introducing innovative recycling processes, promoting circular economy models, and developing technologies to manage waste more efficiently.

How do CleanTech startups support energy efficiency efforts?

CleanTech startups support energy efficiency by creating smart technologies, energy management systems, and efficient appliances that optimize energy consumption and reduce wastage.

How can individuals and businesses get involved with CleanTech startups?

Individuals and businesses can support CleanTech startups by becoming customers, investors, or partners. Embracing and adopting their sustainable products and practices can also contribute to a greener future.

What does the future hold for CleanTech?

The future of CleanTech looks promising, with growing global awareness of environmental challenges. As technology advances and sustainability becomes a higher priority, CleanTech startups will continue to innovate and lead the way towards a more sustainable and cleaner planet.

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