9 Cleantech Companies in Seattle Making the World a Little Greener

Written by Alyssa Schroer
November 12, 2023Updated: December 12, 2023

Phrases like going green, clean energy and renewable resources have been popular over the last couple decades but very minimal improvements have been made in the way we utilize resources and generate energy. Luckily, there are companies and organizations on the case, specifically in the Seattle area. The following tech companies and startups are putting their money where their mouth is, creating innovative green and clean technology. Find out what they’ve come up with.

Top Seattle Environmental Companies to Know


levelten energy clean tech companies seattle
levelten energy

Founded: 2016

What they do: LevelTen Energy gives commercial and industrial customers access to the most cost-effective renewable energy. The company facilitates a marketplace for buyers and sellers to make efficient connections and transactions.

How they’re changing cleantech: LevelTen provides buyers with transparency and sellers with more access to customers, while streamlining the entire process.


drift clean tech companies seattle

Founded: 2015

What they do: Drift is an affordable clean energy provider for residences and small businesses. Their solutions connect a customer with clean energy suppliers and provides a dashboard to display impact and savings over time.

How they’re changing cleantech: Drift makes powering with clean energy more accessible and affordable for companies and people without deep pockets.


energ2 clean tech companies seattle

Founded: 2003

What they do: EnerG2 creates carbon materials for energy storage, providing products like batteries, ultracapacitors and adsorbed natural gas. Their laboratory-scale technologies have been outfitted for commercial manufacturing and strive to alter how the world creates, utilizes and conserves energy.

How they’re changing cleantech: EnerG2’s technology lowers costs and improves efficiency in storage and addresses safety concerns.


helion energy clean tech companies seattle
helion energy

Founded: 2013

What they do: Helion Energy is working on a Fusion Engine to create clean electricity at a low cost. Because the technology is new, they have a goal of running a commercial plant within the next several years.

How they’re changing cleantech: Using fusion for clean energy will reduce carbon emissions and is safer than the nuclear power currently in use.


hydrobee clean tech companies seattle

What they do: Hydrobee makes products that generate power through sun, heat or movement for personal power needs. The company is creating game-changing products like a compact solar panel that can charge a battery brick in under an hour to a thermal power tower storing electricity from the heat of small stoves or chimneys.  

How they’re changing cleantech: Hydrobee’s products will potentially provide new power capabilities to parts of the world with limited access to electricity.


modern electron clean tech companies seattle
modern electron

Founded: 2015

What they do: Modern Electron is creating a new way to generate electricity without the need for the expensive engines and turbines still widely used today.

How they’re changing cleantech: With a goal of replacing outdated modes of power with compact, heat-to-electricity generators, the company seeks to make electricity cheaper, more reliable and accessible anywhere.


oneenergy clean tech companies seattle

Founded: 2009

What they do: OneEnergy develops large-scale solar energy projects for utility, institutional and commercial customers.

How they’re changing cleantech: The company goes beyond the modest set of panels often seen on the roofs of homes. They work with their clients to create solar farms and projects to access clean power on a larger playing field.


optimum energy clean tech companies seattle
optimum energy

Founded: 2005

What they do: Optimum Energy helps companies and organizations reduce their energy use and expenses. The software company works with industries including healthcare, pharmaceuticals, higher education, commercial buildings and data centers to cut their carbon footprint, save up to 50% on energy and increase the life span of equipment.  

How they’re changing cleantech: Just within the United States, commercial buildings use billions of gallons of water every single day and Optimum provides solutions to reduce that consumption significantly.


principle power clean tech companies seattle
principle power

Founded: 2007

What they do: Principle Power brings wind energy to the world with offshore technology. The company sells their wind turbine technology to developers and independent power producers and is then present during the entire lifecycle as a service provider.

How they’re changing cleantech: Principle assembles their WindFloat technology on-shore, providing lower costs and risk while also minimally impacting seabeds.


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