Top 16 Green Energy startups in Seattle
Mar 01, 2026
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25
1
Funding: $169.2M
Omnidian is a provider of comprehensive protection plans for investments in residential and commercial solar energy systems.
Omnidian is a provider of comprehensive protection plans for investments in residential and commercial solar energy systems.
2
Funding: $139.6M
LevelTen is the safest, most cost-effective way for C&I customers to purchase renewable energy.
LevelTen is the safest, most cost-effective way for C&I customers to purchase renewable energy.
3
Funding: $84M
Avalanche is a fusion energy startup that, unlike its competitors, is trying to create a miniature version of the fusion reactor. Their reactor is only 9 centimeters in diameter (the new version will increase to 25 centimeters and is expected to produce around 1 megawatt). The smaller size allowes Avalanche to speed up the process. The company tests modifications to its devices "sometimes twice a week," which would be difficult and expensive with a larger device. To confine the plasma, Avalanche's reactor uses an extremely high-voltage electric current to attract plasma particles into orbit around an electrode. It also uses magnets to maintain order, although they are nowhere near as powerful as those in a tokamak. As the orbit narrows and the plasma speed increases, the particles begin to collide with each other and fuse.
Avalanche is a fusion energy startup that, unlike its competitors, is trying to create a miniature version of the fusion reactor. Their reactor is only 9 centimeters in diameter (the new version will increase to 25 centimeters and is expected to produce around 1 megawatt). The smaller size allowes Avalanche to speed up the process. The company tests modifications to its devices "sometimes twice a week," which would be difficult and expensive with a larger device. To confine the plasma, Avalanche's reactor uses an extremely high-voltage electric current to attract plasma particles into orbit around an electrode. It also uses magnets to maintain order, although they are nowhere near as powerful as those in a tokamak. As the orbit narrows and the plasma speed increases, the particles begin to collide with each other and fuse.
4
Funding: $36.5M
AltaRock Energy focuses on the development of geothermal energy resources and Enhanced Geothermal Systems (EGS).
AltaRock Energy focuses on the development of geothermal energy resources and Enhanced Geothermal Systems (EGS).
5
Funding: $19.8M
Electric Era Technologies develops AI-controlled battery storage for the cost-effective operation of charging stations.
Electric Era Technologies develops AI-controlled battery storage for the cost-effective operation of charging stations.
6
Funding: $11.8M
Evergreen creates a marketplace for clean energy projects that ensures and quantifies the impact of every Renewable Energy Certificate.
Evergreen creates a marketplace for clean energy projects that ensures and quantifies the impact of every Renewable Energy Certificate.
7
Funding: $10.9M
Oscilla Power's Triton wave energy converter will deliver cost competitive, utility-scale energy by combining best-in-class energy capture and power production with unparalleled reliability and survivability.
Oscilla Power's Triton wave energy converter will deliver cost competitive, utility-scale energy by combining best-in-class energy capture and power production with unparalleled reliability and survivability.
8
Funding: $10.1M
Allumia funds, designs, install and maintain a lighting upgrade for commercial and industrial customers.
Allumia funds, designs, install and maintain a lighting upgrade for commercial and industrial customers.
10
Funding: $3.2M
CTFusion is a startup that uses a patented technology called Imposed-Dynamo Current Drive (IDCD) to generate compact and magnetically-confined fusion plasmas.
CTFusion is a startup that uses a patented technology called Imposed-Dynamo Current Drive (IDCD) to generate compact and magnetically-confined fusion plasmas.
11
Funding: $1.8M
XFlow Energy manufactures vertical-axis wind turbines (VAWTs) that reduce the cost of wind energy generation.
XFlow Energy manufactures vertical-axis wind turbines (VAWTs) that reduce the cost of wind energy generation.
12
Funding: $1.2M
Bayou Energy is a utility data access, actions and sharing platform company that connects clean energy companies to the grid.
Bayou Energy is a utility data access, actions and sharing platform company that connects clean energy companies to the grid.
13
Funding: $1M
Emerald Battery Labs is developing sodium-ion battery technology. This energy storage option eliminates the need for lithium, which is in high demand, difficult to mine and limited in production. Sodium, on the other hand, is much cheaper and is the same element as table salt. Sodium-ion batteries also last longer and pose a lower fire hazard. Emerald operates out of the University of Washington's CoMotion Labs and utilizes the university's clean energy testing facilities for its manufacturing operations. The startup is scaling up production and seeking partners for pilot testing of its products.
Emerald Battery Labs is developing sodium-ion battery technology. This energy storage option eliminates the need for lithium, which is in high demand, difficult to mine and limited in production. Sodium, on the other hand, is much cheaper and is the same element as table salt. Sodium-ion batteries also last longer and pose a lower fire hazard. Emerald operates out of the University of Washington's CoMotion Labs and utilizes the university's clean energy testing facilities for its manufacturing operations. The startup is scaling up production and seeking partners for pilot testing of its products.
15
Zin Boats is a Seattle-based company that manufactures, engineered, and builds electric boats.
16
Mazama Energy is a geothermal operator and development firm committed to developing new techniques and technology for removing heat.
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