(credit: Mike Weston)

According to the International Energy Agency, cutting carbon dioxide emissions in half by 2050 will require almost half the world’s energy to come from sustainable sources (like sun and wind, instead of oil and coal).

These alternative energy sources are getting cheaper and more popular in the U.S., but the New York Times has just revealed a little-known fact about the solar and wind energy we’re learning to love: it’s backed up by coal power.

That’s right. Because the sun isn’t always shining and the wind isn’t always blowing, energy from clean sources can’t consistently meet the needs of our power-hungry populace. So when output dips on the wind farms, it has to be supplemented by old-fashioned power sources.

And the power plants of yesteryear just aren’t built for that kind of one-and-off output. The bottom line: Either alternative energy has to advance to the point of not needing supplementation, or traditional power plants need to spend a lot of money updating their equipment.

We wonder… could there be some financial incentive that would get the old energy companies to play nice with the new ones?

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Tags: alternative energy, solar power, wind power