Fiber-reinforced composites is provided. The composites include a plurality of prepreg layers, each comprising a polymeric resin and a plurality of fibers disposed therein; and at least one electrically-conductive layer at least partially embedded in the plurality of prepreg layers. These fiber-reinforced composites can save weight relative to externally provided wires and can be provided in forms suitable for use in automated fiber placement and automated tape layup machines. Advantageous applications include uses in lightning strike protection, energy storage, signal transmission, and power distribution.