New Delhi: India will be world's third largest economy by 2030 but its energy demand will slow down to 4.5 percent, global energy giant BP plc said on Monday.

"By 2030 China and India will be the world's largest and third largest economies and energy consumers, jointly accounting for about 35 percent of global population, GDP and energy demand," BP's chief economist Christof Ruhl said releasing BP's Energy Outlook 2030.

There would be no surge in energy demand as India industrialises. Demand growth slows to 4.5 percent per annum (vs 5.5 percent pa in 1999-2010) as improvements in energy efficiency partly offset the energy needs of industrialization and infrastructure expansion.

India's dependence on imports to meet its gas needs will jump to 47 percent by 2030 while the same for oil will grow to 91 percent. The nation will be 40 percent dependent on imports to meet its coal needs.

He said India remains on a lower path of energy intensity; by 2030 it consumes only about half the energy that China consumes today, at a similar income per capita level as in China today.

Over the next 20 years China and India combined account for all the net increase in global coal demand, 94 percent of net oil demand growth, 30 percent of gas, and 48 percent of the net growth in non-fossil fuels.

Coal remains the main commercial fuel, but its share falls from 70 percent to 55 percent in China as a result of maturing industrial structure, and from 53 percent to 50 percent in India due to domestic resource constraints.

Oil's share is flat at 18 percent in China and falls to 26 percent in India, constrained by prices and growing import dependency. Gas gains market share along with nuclear and renewables in both countries, BP said.

In India, the share of industry continues to grow, as infrastructure development catches up and manufacturing expands to absorb a growing labour force, but it never reaches the Chinese level. "India therefore remains significantly less energy intensive, with a relatively high share of the service sector in GDP.”