A reciprocating motion energy conversion apparatus is adapted to capture kinetic energy of wind, waves, or other reciprocating or turbulent motion in order to generate electricity. A rolling shaft rests on a shaft guide frame, with the rolling shaft being coupled to the input shaft of at least one electric generator. As the shaft guide frame tilts or rocks, the rolling shaft rolls on the shaft guide frame, turning the input shaft of the generator and producing electricity. In a Wave rocker embodiment, the shaft guide surface is secured within a buoyant, waterproof enclosure, which is placed in a body of water to convert energy from wave motions. In a Wind board embodiment, the shaft guide frame is suspended from two swing panels, which are put into swinging motion by turbulent winds, causing the rolling shaft to roll and turn the input shaft of each pair of electric generators.