In absorbing the dizzying series of foreign policy challenges facing this president and the next, one factor obviously stands out. Oil - the damage it does and the tyrants it enables - is the great enemy, from Georgia to Iraq. Finding a way to get ourselves off this stuff is the most urgent national security need we have. Which is why this progress on solar power is so encouraging:

At 800 megawatts total, the new plants will greatly exceed the scale of previous solar installations. The largest photovoltaic installation in the United States, 14 megawatts, is at Nellis Air Force Base in Nevada, using SunPower panels.

Spain has a 23-megawatt plant, and Germany is building one of 40 megawatts. A recently built plant that uses mirrors to concentrate sunlight, called Nevada Solar One, can produce 64 megawatts of power.