Top California Greentech Startups (151)

Revivn is a fully integrated hardware lifecycle solution, promoting global responsibility while providing IT with enterprise-class service and security. Working with companies like Instacart, Lyft & Teach for America we are changing the way companies view old technology with a new model that focuses on repurposing electronics. In partnering with Revivn, companies make the vital choice to responsibly retire, repurpose,...

Global Green USA is a nonprofit environmental organization and the American affiliate of Green Cross International. It supports underserved communities through programs that educate and empower residents to address climate change, while advancing green cities, neighborhoods, schools, affordable housing, climate resilience, and environmental justice. The organization also partners with governments, policymakers, and corporations on sustainability, net-zero planning, reforestation, and reducing...

Eden is the full-stack solution for office management. Our mission is to create a better place to work, for everyone. Our services include office cleaning, supply stocking, IT support, handyman services, and taskers. Each Eden client has a dedicated account lead to ensure an insanely great experience. Eden is venture-backed from some of the best in

Lilac Solutions develops commercially ready direct lithium extraction technology for brine resources. Its proprietary ion-exchange materials, equipment configurations, and process engineering help lithium producers recover lithium faster, more affordably, and with lower environmental impact than conventional evaporation-based methods. The company designs scalable solutions for diverse brines, supporting expanded lithium supply for global electrification while reducing freshwater use and land disturbance.

Over millions of years, silicate rock weathering has regulated Earth’s climate. By crushing silicate rocks and spreading them on agricultural soils - an approach called Enhanced Rock Weathering (ERW) - we can accelerate Earth’s natural process into a solution capable of addressing the urgency of climate change. Existing agricultural and silicate rock sites - namely 5,000+ global silicate rock quarries surrounded...

At Valar Atomics, we're redefining what's possible in energy. Our mission is to make clean, high-temperature nuclear power scalable—unlocking abundant energy for industry, hydrogen, and next-generation manufacturing. We are a team of builders, engineers, and operators who believe nuclear energy should be fast to deploy, factory-made, and built for the real world. Our first pilot plant in Orangeville, Utah will...

Essel specializes in ensuring your projects success by managing the ideal outcome in 3 key areas: Workforce Augmentation: For the AEC & Emergency Response sectors - we make sure you have the workforce to execute on your project. Whether it be high volume environmental technicians or subject matter experts - we have the resources to provide the workforce that will...

WRA, Inc. is an employee-owned environmental consultancy firm composed of planners, engineers, and scientists. They specialize in navigating complex projects involving wildlands, parks, community spaces, and infrastructure. Their mission is to cultivate a sustainable future where people and the environment thrive, aiming to leave lands better than they found them through responsible project management and long-standing community relationships.

Silicon Valley Clean Energy (SVCE) is a community-owned agency providing carbon-free electricity to a majority of Santa Clara County communities, motivated by climate action.

Mango Materials'​ technology uses waste biogas (methane) to produce poly-hydroxyalkanoate (PHA) powder, a valuable biopolymer that is converted into a variety of eco-friendly, plastic products such as cosmetic packaging and a polyester replacement for textiles. Due to a rising preference for green products, demand for biodegradable and non petroleum-based plastics is growing rapidly. Our climate positive technology transforms greenhouse gas...

Climate Policy Initiative (CPI) is an independent nonprofit analysis and advisory organization focused on climate finance and policy. It helps governments, businesses, and financial institutions drive economic growth while addressing climate change. Founded to support nations building low-carbon economies, CPI develops and applies research on climate, energy, and land-use policies, helping decision-makers design and implement effective solutions worldwide through evidence-based...

FieldKit is an open-source software and hardware platform (environmental sensors, app, and FieldKit.org website) that allows individuals and organizations to collect and share field-based research data and tell stories through interactive visualizations. Designed to be easy to deploy customizable, FieldKit can be adapted to meet the needs of diverse research teams, from biology and ecology to marine and environmental sciences,...

Ascent Environmental, Inc. is an interdisciplinary collaborative based in California, specializing in full-service environmental, planning, and design consulting. They are dedicated to advancing community vitality, climate action, and environmental stewardship. Their expertise includes climate adaptation, urban design, and natural resources management, helping public and private clients solve complex environmental challenges through a combination of science, planning, and a people-first approach.

Aurora is creating a future of solar for all. We’re putting the power of data and technology into the hands of every solar professional to make solar adoption simple and predictable. Our cloud-based platform uses data, automation, and AI to streamline workflows and grow solar businesses faster. As a fast-growing Series D company, we’re disrupting the clean energy industry and...

Range Energy focuses on the electrification of commercial transportation, operating within the clean energy and transportation sectors. The company offers electric trailers and solutions that aim to reduce diesel consumption and emissions in heavy trucking while also extending the range of zero-emission vehicles. Its products are primarily targeted towards the commercial transportation industry. It was founded in 2021 and is...

Verdani Partners is a full service sustainability consulting firm specialized in corporate sustainability, LEED certification and greening and retrofitting existing buildings. We focus on “Making what is here better” by greening large portfolios of existing buildings with profitable solutions and promoting continuous improvement of existing building operations. We offer corporate sustainability strategies, portfolio wide energy optimization strategies, LEED Gap Analysis,...

BlueSky Utility is a leading distributed-generation solar and energy storage developer and independent power producer (IPP). We collaborate with landlords to optimize the value of their asset portfolios and drive down energy expenses through innovative solar and storage solutions.

By design, Avnos is the world’s best shot to get to gigaton scale of carbon dioxide removal from direct air capture. We are a driven team of scientists, engineers and technical operators working together to solve one of the most fascinating and impactful problems the world has to solve: removing legacy carbon emissions in service of cooling the planet. We know...

Span is a startup focused on remodeling electric circuits for older homes, providing a digital alternative to traditional fuse boxes to help families better manage the flow of power to their appliances.

ENFOS is an enterprise software environmental management solution for companies faced with liabilities associated with remediation and decommissioning projects. Founded in 2000, ENFOS serves customers in Oil and Gas, Transportation, Manufacturing, Chemicals and Energy/Utilities. Clients include BP, 7-Eleven, The U.S. Defense Logistics Agency, Dow, Ashland, ConocoPhillips, Sunoco, TravelCenters of America, Celanese Corp., Pacific Gas and Electric, and more.