Will dark energy ever be convertible to usable energy?

One thing regarding "Dark Energy" you need to know is that we do not really know what it is. The very name of it is a bit misleading and could easily cause someone to mistakenly believe it is like other forms of energy we are familiar with (light, electromagnetic, household electricity, etc). read more

Since the density of dark energy is observed to be about [math]10^{-27}\,\mathrm{kg/m^3}[/math], a simple calculation yields that the mass of dark energy inside the entire volume of the Earth is about [math]10^{-6}\,\mathrm{kg}[/math] or 1 milligram. read more