FREY
Shut down
What they do:
FREY is a line of exceptional laundry and clothing care products.…
Quick facts:
HQ: CA, United States
Top Climate & Energy Startups in California
This list has 121 startups and was last updated on Oct 15, 2026. 14 of them are hiring right now. Biggest hubs: San Francisco (90), Los Angeles (12), and San Jose (2). Largest teams: Cruise, Zeitview, and Momentus. Latest round: Circularity Fuels raised $8.79M (Oct 14, 2026).
121 startupsPage 4 of 4
OutSail Technologies
Shut down
What they do:
Revolutionary, Modern Wing Sails
Quick facts:
HQ: San Francisco, CA, United States
Line.Build
Shut down
What they do:
Incentives and financing for energy efficiency upgrades
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HQ: San Francisco, CA, United States
Doblet
Shut down
What they do:
Doblet solves the phone battery problem. We're building the first…
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HQ: San Francisco, CA, United States
Reduced Energy Microsystems
Shut down
What they do:
Building the lowest-power silicon for embedded deep learning and…
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HQ: San Francisco, CA, United States
GTRACK Technologies
Shut down
What they do:
Nanoparticle tracers for reservoir characterization during hydraulic…
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HQ: San Francisco, CA, United States
Phoenix Hydrogen
Shut down
What they do:
First commodity marketplace for hydrogen.
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HQ: San Francisco, CA, United States
Overflux
Shut down
What they do:
Streamline EV charger installations for real estate developers
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HQ: Los Angeles, CA, United States
Choppy!
Shut down
What they do:
FAST FLAVORFUL PROTEIN
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HQ: Los Angeles, CA, United States
WATERFX
Shut down
What they do:
The world's first 100% sustainable water provider (aka alternative…
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HQ: CA, United States
Ohm
Shut down
What they do:
Never jump start your car again.
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HQ: San Francisco, CA, United States
YC S15Early stage
Spero Foods
Shut down
What they do:
dairy reinvented from plants
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HQ: San Francisco, CA, United States
YC S18Growth stage
Canopi
Shut down
What they do:
API to measure and eliminate carbon emissions
Quick facts:
HQ: San Francisco, CA, United States