He greatly overestimated our capability to store/generate power, the reason is apparent in his Foundation series as what he got wrong (cordless appliances and hovering transportation) basically comes down to this; we don't have miniature nuclear fusion devices. Well, actually we do, they just aren't commercially viable to the extent you'll see them in a blender, yet.
I don't know if our most beloved word is "Work!", "Growth!" seems more applicable to the western world, the two are tied pretty close together, though.
Very interestingly our foray into holographic projection so far is in fact just as he describes them: fully transparent cubes where an image is rendered.