Narrator: This is Science Today. Wind power as an energy source is beginning to play a much more prominent role than it has in the past. But as Ryan Wiser, a scientist at the Lawrence Berkeley National Laboratory explains, wind power currently contributes a relatively small fraction of our electricity needs.
Wiser: Wind power contributes about .5 percent of the nation's electricity needs. Solar power contributes far less than even that level. Historically, the reason has been cost. Wind and solar have been higher costs energy sources, but over the last ten years of so, technology advances for wind and to a lesser extent, solar, have driven down those costs pretty considerably.
Narrator: Wiser says we are on the verge of seeing significant expansion of these renewable energy sources, but wind power will never contribute to 100 percent of our nation's supply.
Wiser: I suspect that within the next twenty to thirty years, you may see renewable electricity sources increasing from their current ten percent share to perhaps as high as twenty and thirty percent. But there's still going to be a need for those other conventional sources as well.
Narrator: For Science Today, I'm Larissa Branin.