An energy chain and storage unit for an energy chain having a first chain portion and a second chain portion each including pivotable chain links with upper and lower narrow surfaces, and two side parts (6, 7). At least some of the chain links (2) of the first chain portion (3) have guide elements (12), which project outwards from the side parts (6, 7) allowing the chain links to guide on guide tracks (35), arranged on the outside of the chain links, and at least some of the chain links (4) of the second chain portion (5) have roller elements (13) or sliding elements (14), which project laterally beyond the upper or the lower narrow surfaces (8) of side parts (6, 7) of the chain links and can respectively roll or slide on a region which is located opposite said narrow surfaces (8).

An energy supply system includes a cable store for winding and unwinding an energy cable about a winding center of the cable store. A carrier is provided for the energy cable, and the cable store has an opening for the inlet and outlet of the carrier and the energy cable. The carrier can be guided through the opening in order to guide the carrier and the energy cable in sections in the cable store to the winding center of the cable store over a first guide path through a first guide arc, over a second guide path which adjoins the first guide arc, through a second guide arc, and over a third guide path which adjoins the second guide arc and lies further inwards relative to the winding center than the first guide path using guides.