What does cleantech mean?
Cleantech, a contraction of 'clean technology,' refers to products, services, and processes designed to deliver economic value while minimizing environmental harm. The term encompasses a wide range of innovations, including renewable energy such as solar and wind power, energy storage, water purification, waste reduction, and resource-efficient manufacturing. Cleantech entered widespread use in the early 2000s, when venture capitalists and entrepreneurs adopted it to describe a new wave of environmentally oriented startups, and it has since become a standard term in finance, policy, and journalism. It typically appears in discussions of investment ('cleantech funding'), industry ('the cleantech sector'), and innovation. Related but distinct terms include greentech, a broader umbrella label, and climate tech, which focuses narrowly on addressing climate change. As concern over sustainability has grown, cleantech has shifted from niche jargon to a mainstream descriptor of one of the fastest-growing areas of the global economy.
nounCleantech is short for 'clean technology': products, services, or processes that harness renewable materials and energy sources, reduce emissions and waste, and have a minimal environmental impact.
- The sector or industry of clean technology companies and investments.
- Clean technology itself: products or processes that reduce environmental impact.
"The startup attracted millions in venture funding for its cleantech solutions."
"Venture capital flowed into the cleantech sector throughout the decade."
"Her firm specializes in cleantech, from water purification to grid-scale batteries."
Rare and informal. When used at all, the plural refers to multiple cleantech companies; most writing treats cleantech as uncountable or rephrases to avoid the plural.
"Several emerging cleantechs presented at the conference."
'Cleantech' was popularized in the early 2000s as investors poured billions into solar, wind, and battery startups — coining one of the defining buzzwords of the green economy.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cleantech
Cleantech is a modern English portmanteau blending 'clean' — from Old English 'clǣne,' meaning free from dirt or impurity — with 'tech,' a shortened form of 'technology.' Technology ultimately derives from the Greek 'technē' (art, skill, craft) combined with '-logia' (study or discourse). The compound emerged in English around the late 1990s and early 2000s, popularized by investors and media covering the boom in environmentally focused startups. Its Greek-derived second element links it to cognates such as 'technique,' 'technical,' and 'technician.'
How cleantech is actually used
Cleantech is an informal-to-neutral business term, used chiefly in finance, journalism, and industry contexts rather than everyday conversation. It functions as both a count noun (a company can be 'a cleantech') and an uncountable mass noun for the field as a whole.
Easily confused with cleantech
Greentech is a broader umbrella term covering any environmentally friendly technology, while cleantech more specifically emphasizes technologies that reduce waste, emissions, and resource use.
Climate tech focuses specifically on technologies that mitigate or adapt to climate change, whereas cleantech covers the wider field of low-impact, resource-efficient technology.