Just because energy is there doesn't mean you can use it. You can only use changes in energy, like a battery discharging or a log burning. Zero point energy is the resting energy of empty space, and the only theoretical scenarios where it changes involve the laws of physics being changed and the universe being destroyed. In a sense it's the tension of having laws of nature. I sincerely hope it's not on the menu of consumable fuels.

It's also worth mentioning that quasiparticles are bursts of energy that move through materials. For example a soundwave is a burst of quasiparticles, and the quietest possible sound is one quasiparticle, a phonon. I think this disclaimer should accompany all of the press releases about new particles discovered in condensed matter (solids, basically).