Figures compiled by state lender the Infrastructure Development Finance Company show private promoters’ share of investment has increased from 0.3% of GDP in 2003, to around 4% today.
"India has come much further than people realise in a much shorter period of time," said Rajiv Lall, chief executive of the lender.
India has invested heavily in transport infrastructure over the past decade and has used private investors to deliver new road and rail projects.
However, the country has struggled to get a strong social infrastructure pipeline off the ground, with interest in school and hospital projects remaining relatively low.