10 Greentech Companies in New York City to Know

These NYC greentech companies are developing technologies that reduce emissions, improve energy efficiency and support sustainable food production.

Written by Brennan Whitfield
greentech nyc
UPDATED BY
Ana Gore | Aug 27, 2026
REVIEWED BY
Summary: New York’s greentech sector is tackling sustainability through urban farming, energy analytics and circular electronics. Companies like Back Market, Celonis and Runwise are developing technologies that improve food production, reduce emissions in business operations and extend the life of consumer devices.

While you may think of New York City as a town of exhaust spewing traffic, bright lights and garbage strewn sidewalks, it is actually among the greenest cities in the country. 

The average New Yorker emits less greenhouse gasses a year than their notoriously green San Franciscan counterparts. We have the highest mass transit use in the country, and outrageously expensive real estate has forced us into tiny, energy-friendly apartments. In fact, the average New Yorker uses less than half the electricity of your average San Franciscan, and a fourth of the electricity of someone in Dallas.

And, as great as that is, New York is doing what New York does best — striving for more. The city is home to an astonishing array of greentech firms looking to use big data, innovative ideas and clever algorithms to make the city and the world a greener place. 

Top Greentech Companies in NYC

  • Celonis
  • Gotham Greens
  • Kelvin
  • Enertiv
  • Back Market

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Top Greentech Companies in NYC

Runwise develops wireless building control solutions that optimize heating, cooling, water and gas systems to reduce energy consumption and operating costs. The platform controls infrastructure that previously required dozens of devices, miles of wiring and weeks of labor to install, which are now all deployed wirelessly in one day or less.

 

Celonis uses process mining and process intelligence to help organizations identify and implement sustainability initiatives. Its solutions extract sustainability data and key performance indicators from business systems, then guide companies to reduce process inefficiencies and decarbonize supply chains.

 

Gotham Greens operates sustainable greenhouses across the United States, growing leafy greens and herbs year-round using hydroponic technology that uses up to 97 percent less land and 95 percent less water than conventional farming. Its facilities apply machine learning and data analysis to optimize crop health and efficiency, while its solar-powered operations and regional distribution model work to reduce transportation emissions.

 

Back Market is a marketplace platform that connects consumers with vetted refurbishers to buy and sell refurbished smartphones, laptops and other tech devices. The company offers products at up to 70 percent below new retail prices, with each device professionally tested and backed by a one-year warranty.

 

Kelvin (formerly Radiator Labs) modernizes legacy radiator-heated buildings by upgrading them with heat pumps, precise temperature controls and efficient heating solutions. Its flagship products include the Cozy smart radiator cover, and an adaptive electrification platform that replaces window air conditioners to reduce heating and cooling costs while avoiding carbon fines.

 

Energy CX is an energy procurement provider that helps businesses treat energy like a controllable financial asset through policy-driven strategies and math-based intelligence. Using its ABEL platform, Energy CX monitors energy markets 24/7 to optimize purchasing decisions, reduce spending and manage portfolios across deregulated U.S. states.

 

Revivn is a fully-integrated hardware lifecycle solution that repurposes enterprise IT equipment including laptops, desktops, smartphones and tablets. The company extends the life of technology products by refurbishing devices and placing them back into circulation, reducing electronic waste while supporting underserved communities through its Tech Access program.

 

BrightFarms finances, designs, builds and operates hydroponic greenhouses located near or on grocery stores, bringing fresh produce to market within hours of harvest. The company grows pesticide-free greens and vegetables using customized technology at each location to manage energy, water and production efficiently.

 

Enertiv is a portfolio-scale sustainability and decarbonization platform designed for commercial real estate owners and operators. It provides investor-grade reporting, real-time building monitoring and AI-driven carbon planning to help companies optimize energy performance and ensure regulatory compliance.

 

Nantum AI, a subsidiary of Johnson Controls, is a real estate data and smart building solutions platform focused on energy efficiency and sustainability. Using machine learning, Nantum AI provides recommendations and automation for building operations to reduce energy consumption, lower carbon emissions and optimize indoor comfort.

 

Ashley Brownridge, Rose Velazquez and Margo Steines contributed reporting to this story.

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