It depends on a country’s geographical position, its own energy endowment, the state of its physical infrastructures for transport and storage, the diversification of its supplies, the willingness of its population to trade lower average long-term prices for higher volatility and a host of other issues. Free and global energy trade through smoothly functioning competitive markets would guarantee timely delivery of all necessary energy resources. But then again in such an ideal world, energy supply security would not exist as an issue. But even while reality often diverges drastically from the ideal of a global world of competitive markets, the concept of security of energy supply very clearly includes not only the notion of energy independence but also the notion of energy interdependence. Most countries are relying at least partially on the international trade of energy and will continue to do so.