The SuperCable: dual delivery of chemical and electric power

We consider the general design of an "Energy SuperCable" capable of efficient simultaneous transmission of chemical and electric power over long distances. The electrical component consists of wires or tapes of high temperature ceramic superconductors or MgB₂, while the chemical element comprises liquid or cold gaseous hydrogen or liquid methane. In principle, hydrogen or methane can also serve as cryogens, although for the latter, practical superconducting wire does not yet exist that is able to operate at the required temperature. On the other hand, liquid hydrogen would suffice for present HTSC wire, but one could also consider a "hybrid" design whereby liquid nitrogen is the primary refrigerant and the chemical agent is liquid methane or cold hydrogen gas under pressure. We point out that hydrogen in the SuperCable can perform the dual function of energy delivery and electricity storage on the scale of a pumped hydro facility, the realization of which would revolutionize the marketing of electric power.