Dirty coal to remain world's top power source: IEA

By Nao Nakanishi

LONDON (Reuters) - Coal, the dirtiest source of fuel, will remain the world's main source of power until 2030 and nuclear will lose market share, the International Energy Agency said on Wednesday.

Expectations of slower economic growth have led the IEA to downgrade its 2030 world electricity demand forecast to 23,141 terawatt hours (TWh), but the share of coal generated power would rise to 44 percent by 2015 from 41 percent in 2006.

It would stay at that level to 2030.

"Globally, coal-based electricity is projected to rise ... to almost 14,600 TWh by 2030, giving rise to significant increases in associated CO2 emissions," the Paris-based agency said in its World Energy Outlook.

Most of the growth was expected in non-OECD countries, such as China, which the IEA expected soon to become the world's biggest electricity consumer. Its demand for power doubled between 2000 and 2006.

The IEA urged stronger policies for carbon capture and storage (CCS), saying the world was likely to make only a minor contribution in the period.

"Market mechanisms alone will not be sufficient to achieve the demonstration program on the scale required. Another challenge is financing the necessary CO2 transport infrastructure," it said.

Despite a global nuclear renaissance sparked by efforts to cut greenhouse gas emissions and mitigate climate change, the IEA expected nuclear's share in power generation to drop to 10 percent by 2030 from 15 percent in 2006.