Included herein is an electronic pen (200) with pen position detection comprising at least one electric voltage source (206), at least a digital control unit (217, 106), a writing lead (209), at least one data transfer module (219, 109) and at least two position determination sensors (201, 202, 101, 102) for determination of the position and / or motion of the electronic pen (200), characterized in that the electronic pen (200) comprises an energy management unit (218, 110) in communication with the digital control unit (217, 106) for managing the electrical energy consumption, in particular to minimize the electric energy consumption, and / or comprises means (for example one of 103, 104, 105, 204, 205, 212, 213, 214, 215) to be able to generate electrical energy itself.