A superconducting magnetic energy storage (SMES) device capable of safely carrying 100 kilowatt-hours of energy would be quite large, potentially several meters in height and length. The energy equivalent of 100 kWh is approximately 360 megajoules. High-temperature superconducting materials, like YBCO, would require a significant amount of cryogen, such as liquid nitrogen, for operation, though specific consumption rates were not detailed. Existing commercial SMES devices can provide specifications that may help in estimating size and cryogen needs, even if they are not designed for exactly 100 kWh. Overall, the discussion emphasizes the substantial size and complexity of such energy storage systems.