All the five studies show evidence of a substantial and continuous improvement in India's energy efficiency. India's energy efficiency is comparable to Germany. Only Japan, Britain, Brazil and Denmark have lower energy intensities than India, the report said.

Ramesh said an Enhanced Energy Efficiency Mission has recently been approved in principle under the National Action Plan on Climate Change.

Of the five studies, the ministry carried out three with the partner organisations like the National Council of Applied Economic Research (NCAER), Jadavpur University, The Energy Research Institute (TERI) and the Integrated Research and Action for Development (IRADe). The other two are by TERI and research firm Mckinsey.

Authorities said these studies were taken up with a view to develop a fact-based perspective on climate change in India that clearly reflects the realities of its economic growth, the policy and regulatory structures and the vulnerabilities of climate change.

India unveiled the study nearly 100 days before the UN summit on climate change at Copenhagen. Countries like India and China have been opposing developed countries' stance on carbon emission reduction goals.