Techknowgreen Solutions Ltd (TSL) (MCap 195 Cr), earlier known as  “Technogreen Environmental Solutions” was established in 2001 as a partnership firm. It was later converted into a public limited company in 2023. The company is one of the few listed players in the environmental consultation service space. With over 20 years of experience, the management claims that they were one of the pioneers in environmental compliance and consultancy in India before “sustainability” became a popular term.