NextGen. | 1,416 followers on LinkedIn. NextGen - The Energy & Environment Company NextGen believes in the concept of “Sustainable Energy” that is economically, environmentally and socially better than conventional sources of energy. This can be achieved only when the energy is cheaper and greener with local community benefits compared to conventional sources of energy. NextGen’s revolutionary “Bio-CNG” technology is truly the “Sustainable Energy” that is changing the energy landscape across the country.