The proposal comes at a time when moratoriums on new leases, as well as restrictions on exploration in the Arctic National Wildlife Refuge and two areas of the outer continental shelf in the Atlantic and Pacific, "have had the effect of really limiting where we can look for energy Americans need," says Mr. Ranger.
At the same time, with new exploration and drilling technologies, the odds of success are becoming more favorable.
The Gulf of Mexico, for example, is generally seen as a mature site for oil. But recent advances allowing offshore rigs to drill deeper has led to discoveries since the mid-1990s that have essentially yielded the equivalent of the amount imported from Saudi Arabia, says Ranger. Natural-gas production there has increased fourfold over the same period.
In the Rocky Mountain states – New Mexico, Colorado, Utah, Wyoming, and Montana – the ability to extract natural gas from coal seams and other technological advances mean the region now produces 20 to 25 percent of the nation's gas. That figure could increase to as much as 40 percent by the 2020s.