While the concept had been out since 2013 the design of "IXS Enterprise" was popularized in June 2014 after a series of media outlets reported on the conceptual artwork done by Dutch artist Mark Rademaker in collaboration with NASA. According to Mark Rademaker, over 1,600 hours have been spent on the conceptual artwork that he created.
The energy required to power the warp drive, according to White, is approximately the negative (negative energy is required for the Alcubierre Drive concept to function) mass-energy equivalence of Voyager 1, which weighs ~700 kilograms. Using E=mc², -700 kilograms of mass becomes ~-65 exajoules of energy (this number is not definitive and can be further reduced). The ship has two thick outer rings (to reduce required energy) that generate the warp field - a contraction of space ahead, and expansion of space behind it. The space inside the rings is optimized to fit more space for cargo, crew and equipment.