Is the Space Program Running Out of Fuel?

I have written in the past about a lack of vision in the U.S. space program, but I did not expect to write about the potential loss of fuel for our spacecraft.  A recent NPR story, The Plutonium Problem: Who Pays For Space Fuel?, noted how the U.S. space program may face problems obtaining plutonium-238 for its spacecraft and rovers.  For instance, the new Mars rover Curiosity will use 8 pounds of plutonium-238 as part of its exploring on the martian surface.  

The article quotes Len Dudzinski, the program executive for radioisotope power systems at NASA headquarters, who stated, "Because the United States has access to plutonium-238, we are the only country that has ever sent a science mission beyond Mars."  Other spacecraft, from the Voyager missions to the more recent Cassini, are dependent upon this fuel. 

As always, the issue is resources or, more specifically, budget battles.  Who should pay for this fuel, NASA or the Department of Energy?  Of course, budget battles have become much more acrimonious in recent years, with many projects such as the James Webb Space Telescope being held hostage (though even this battle was positively resolved recently, giving me a little more hope).  

This is a tough time to find extra funds for anything, but NASA needs to push such projects and the President needs to be the Agency's advocate.  We are already stumbling about looking for the next space vehicle as well as the next place to visit, which has not been an inspiring picture to date.  But we are dangerously close to grounding all of our projects if we lack the fuel to continue. Yes, maybe new fuels will be found, but I would not walk away from anything right now until we have proven alternatives.  If we want to remain part of the space race (or even space jog), we need to have some basic items to continue.  I hope our leaders in DC realize this.

Note:  NPR reported on this very same issue in September 2009. And Space News reported that the Russians were holding on their plutonium-238 supplies back in December 2009.  This is not a new problem, but I guess Congress needs to be reeducated on a regular basis.