re: “However, quantum physics calculates that a one cubic centimeter of vacuum still contains about 0.000000000000000000000000002 kilowatt hours (kW-h) of energy. “
It’s energy (energetic particles) that are just ‘transiting through’ ... look what shows up in a Wilson cloud chamber for instance:
https://www.youtube.com/watch?v=a9tl7O7AWhE
Right, and ‘tain’t much.