Greentown Houston Is Here—Meet Our 25+ Inaugural Startups

Ten years ago, Greentown began when four startups decided to split the cost of rent and resources. Today, we are proud to support more than 115 climatetech startups that are reimagining how we use and store energy, how we manufacture goods, our transportation infrastructure, and so much more—all in the name of climate action and creating a just, sustainable future for all. 

On Earth Day 2021, Greentown Houston opens its doors to a new ecosystem of entrepreneurs who are tackling our biggest climate challenges and shaping the energy transition. These are the entrepreneurs and technologies that will usher in a new era for the energy capital of the world.

Please join us in welcoming, celebrating, and supporting these incredible startups!

Agtech + Water

Applied Gaia is committed to preserving the agriculture industry through the production of high-quality biochar—an odorless, clean material generally made from waste biomass that would otherwise be burned or landfilled.

Katz Water Technologies aims to solve the world’s water problems by deploying cutting-edge water purification and desalination technology worldwide.


Quantum New Energy’s platform, EnerWisely, helps people transform their unused energy consumption data into personalized, actionable insights to maximize their monetary savings and reduce their environmental impacts.

Varea Energy aims to accelerate the transition to an energy-efficient future by rooting out inefficient waste, water, and energy systems to increase sustainability and decrease operational costs for commercial facilities.


ClearValue deploys zero-net-carbon, sustainable, renewable, and resilient electrical generation and transportation power systems via combustion of in situ, sunlight-powered, bio-chemically formed, pure hydrogen and oxygen.

Eclipse Solar Projects finances, develops, owns, and operates utility-scale solar projects in North America through newly developed technology and potential battery storage operations.

Ennuity Holdings is creating a brand new asset class that allows individuals to buy out their electric utility bill, funding construction of clean energy infrastructure while receiving an in-kind return that substantially beats other types of fixed income investments.

Excipio Energy is an offshore renewable energy company integrating wind, wave, currents, OTEC, and power-to-fuel in a single floating platform.

REVOLUTION Turbine Technologies is developing a revolutionary, carbon-free power generation solution that solves pain points for upstream oil and gas.

Revterra is developing a highly efficient kinetic energy storage solution for utility-scale applications, such as the storage of solar and wind energy.

Syzygy Plasmonics is developing a new type of photocatalytic chemical reactor to revolutionize the industrial gas, chemical, and energy industries.

Terrapin Geothermics develops energy projects from heat that reduce the emissions intensity of the industrial sectors.

Veloce Energy’s FastGrid™ system, initially focused on cost-reduction in EV charging stations, uniquely combines energy storage, intelligence, a streamlined installation system, and a charging-infrastructure-as-a-service model.


Applied Bioplastics uses plant matter to produce affordable polymers with properties that are equal to or better than those of traditional petrochemical plastics, resulting in a noticeable carbon footprint reduction.

Cemvita Factory is applying synthetic biology to reverse climate change and decarbonize heavy industries.

Triton GHG Environmental Services manufactures mobile skid-mounted units that displace diesel usage.

Platform Solutions

ALLY Energy is an energy tech and human capital services company that offers talent engagement, culture development and design, recruitment training and coaching, consulting, and more.

ClearTrace’s cloud-based SaaS solution leverages blockchain technology to track, trace, and manage renewable energy delivery connected to corporate sustainability and ESG goals, while simultaneously creating transactable digital assets for energy and environmental attributions.

e^2: equitable energy is a multi-brand cause-marketing platform that onramps consumers on the road to drive carbon neutral, accelerate deployment of sustainable energy solutions, and incentivize adoption of zero-emission vehicles.

Renu Energy focuses on “Renuable” energy technologies to create efficiency and economic advantages with a responsible and accountable future. The company specializes in the recycling industries, water filtration, and wind energies.

Skylark Wireless enables truly ubiquitous broadband connectivity using fixed wireless systems that avoid the high cost and environmental disruption of trenching or stringing fiber.

Footprint is a web-based enterprise software solution for climate education and action.

Innovator Energy develops and deploys several breakthrough solutions in cooling, heating, and heat transfer.

Topl’s blockchain ecosystem is built to prove ethical and sustainable practices, empowering businesses and other organizations to drastically cut certification costs and produce unprecedented trust and transparency around their ESG initiatives.


Black Mountain Metals is a global battery metals mining company, specifically focused on sustainable nickel and copper mining for lithium-ion battery cathodes.

SeaSatellites’ electric unmanned surface vehicles, which are designed to carry sensors and payloads on long missions, are accelerating the global transition to efficient operations and cleaner oceans.