An electrical generation apparatus is described comprising a magnetic mass (18) magnetically attracted to a guide member (14) such that the mass (18) is moveable, in use, along a path defined by the shape of the outer periphery of the guide member (14), the mass (18) being moveable past a coil (20), and at least one repulsion magnet (16a, 16b) of the same polarity as the mass (18) and positioned to repel the mass (18) such that the mass (18) undertakes a pendulum-like reciprocating motion, repeatedly passing the coil.