Canada is the world's most energy-secure nation, and Indonesia is at the bottom of a new Energy Security Index compiled by Energy Security News and The Washington Times.

The study ranks the top oil-producing nations on their ability to export petroleum products safely to the rest of the world. It bases its assessment on each country'sproduction and refining levels, its level of internal political strife and its ability to transport oil to other nations, given potential - or real - impediments.

Canada, Norway and China are Nos. 1, 2 and 3 in energy security, according to the study, which gleans its data from the Energy Information Administration and the CIA World Fact Book. These nations' oil-exporting businesses would suffer the least from disruption caused by government or internal strife, terrorist attack or a sudden inability to ship by sea, according to the study.

Iraq, Kazakhstan and Indonesia are Nos. 19, 20 and 21 as the least energy secure nations because of government instability, the substantial likelihood that a terrorist attack or conflict at sea could prevent them from exporting oil, and the amount of oil the countries refine per day.

The index also ranks how secure countries are in their oil-consumption habits. And on that list, the U.S. practices the riskiest oil-consumption behavior. The main reason: The U.S. imports most of its oil needs. Of the 21 million barrels of oil the United States uses per day, 14 million barrels are imported.

Consuming countries are ranked on how much oil, if any, they produce and refine per day, as well as where their imports come from and how much they import.

On the oil-production side, the United States ranks as the 11th-most secure among the top 21 oil-producing countries examined for the index. There is little chance that political or governmental discord could affect the U.S. exporting business, but it ranks in the middle among countries whose business might be disrupted by terrorist attacks. Oil security in the U.S. is clearly threatened by the fact that al Qaeda calls it a major target.

Transportation and geopolitical issues clearly correlate to how energy secure a nation is, said Sarah Ladislaw, an energy and national security specialist at the Center for Strategic and International Studies. Energy specialists have placed more emphasis lately on political and internal conflict, as well as the growing danger of piracy on the high seas, when they evaluate how safe oil exports might be.

Saudi Arabia has the world's largest proven oil reserve - 267 billion barrels, or one-fifth of the world's known supply - but it is only the eighth most energy-secure nation owing to the worry that terrorists might attack there. In addition, internal disruptions from occasionally active dissidents could also affect its ability to export oil.