Energy security vs. energy independence

Energy interdependence can actually be good for energy security: Just
look at natural gas markets. Right now nearly all the natural gas that
Americans consume comes from U.S. and Canadian fields; only 3 percent
comes into the country by tanker in the form of liquefied natural gas.
This renders the United States highly vulnerable to disruptions on its
home continent. If terrorists or a hurricane took out a key pipeline,
it would be hard to bring in alternative supplies from outside North
America, and prices would spike upward. By buying more liquefied
natural gas from a diverse range of foreigners, the United States would
reduce its energy independence but enhance its energy security.

Here is more by Sebastian Mallaby.