Wind works well in the North Sea or Texas, but not on rooftops.

FORBES: Why Solar Will Win

It is no coincidence that the bench mark oils, like North Sea Brent or West Texas, are light sweet crudes.

FORBES: Obama Released the SPR, and All He Got Was...Nothing

It's looked not only at Brent crude but at some other exotic hydrocarbon cocktails - West Texas Intermediate, the Argus Sour Crude Index, Brent Blend or BFOE (the basket of the North Sea's Brent, Forties, Oseberg and Ekofisk), Dubai and Oman, Tapis and Minas, and East Siberia-Pacific Ocean Blend.

BBC: Setting prices crudely