Abstract: The invention relates to a method and apparatus for producing energy, in such a way that the apparatus is based on weights (4) and floats (3), and in which the weights/floats are situated, for example, on arms set to rotate on bearings around a pivot point (1), so that at least one weight (4) can be moved in an essentially radial direction. The arm (2), to which the weight (4) is attached and locked in a position moved towards the axle (1), is moved from a position deviating from a vertical position, locked there, and the weight (4) is released, so that it carries out work, such as pumping the liquid. The arm (2) being released to return to its initial position, so that the means (5, 6) connected to the weight, returns the weight (4) by resting against a counter-surface (7) with a diminishing radius.