The fine article shows them lowering a container from a crane. I'd love to see them connect the crane to an electric generator and actually regen the potential energy of the container into electricity.
Even more efficient might be raising another container at the same time in a (mostly) balanced manner. Then you don't have as much loss from conversion/storage.
Fun fact: many inclined elevators work this way :)
Fun fact: many inclined elevators work this way :)