The BSE has launched the Green Index called Greenex. This is India's first carbon-efficient live index. The index has been developed by the BSE in collaboration with IIM Ahmedabad. It is the second thematic index launched by BSE. BSE Greenex will measure the performances of companies in terms of carbon emissions. The index will target socially-aware investors. There are many investors willing to pay a premium for green investments in companies to get better returns. The new index will comprise 20 stocks based on a minimum carbon footprint, market capitalisation and turnover. The BSE Greenex will assess the energy efficiency of firms, based on energy and financial data.