Apparatuses, methods, and systems associated with and/or having capacitors are disclosed herein. In various embodiments, a capacitor may be formed within a substrate having an interwoven-fiber material. In various ones of these embodiments, a capacitor may have a first electrode including an activation material disposed on a surface of an interwoven-fiber material, a second electrode including an electrolytic solution, and an insulating material disposed between the first electrode and the second electrode.