A system comprising, an arrangement for hybrid power generation, the arrangement comprising a combustion engine, an electrical storage medium, at least one hydraulic element coupled to the combustion engine and the electrical storage medium, at least one first converter, arranged in connection with the combustion engine and the electrical storage medium, wherein the at least one first converter is configured for energy conversion between the at least one hydraulic element and the electrical storage medium, a transmission coupled between the combustion engine and the at least one first converter for allowing gearing between the combustion engine and the at least one first converter, and at least one one-way coupling arranged between the combustion engine and the at least one hydraulic element, wherein the arrangement, during operation of the combustion engine, is configured to operate the at least one hydraulic element via the at least one one-way coupling, and wherein the arrangement, during operation of the electrical storage medium, is configured to operate the at least one hydraulic element via the at least one first converter, and further comprising a wheel arrangement comprising at least one wheel, wherein the electrical storage medium is coupled to at least one of the at least one wheel, and at least one second converter arranged between the at least one wheel and the electrical storage medium and configured for energy conversion between the at least one wheel and the electrical storage medium, and at least one transducer unit arranged between the electrical storage medium and the at least one second converter and configured for inversion and/or frequency modulation of electrical signals from the electrical storage medium to the at least one second converter, and a brake system comprising the at least one second converter and the at least one transducer unit, wherein the brake system is configured to convert mechanical braking power of the wheel arrangement into electrical energy, and to feed the electrical energy to the electrical storage medium. an arrangement for hybrid power generation, the arrangement comprising a combustion engine, an electrical storage medium, at least one hydraulic element coupled to the combustion engine and the electrical storage medium, at least one first converter, arranged in connection with the combustion engine and the electrical storage medium, wherein the at least one first converter is configured for energy conversion between the at least one hydraulic element and the electrical storage medium, a transmission coupled between the combustion engine and the at least one first converter for allowing gearing between the combustion engine and the at least one first converter, and at least one one-way coupling arranged between the combustion engine and the at least one hydraulic element, a combustion engine, an electrical storage medium, at least one hydraulic element coupled to the combustion engine and the electrical storage medium, at least one first converter, arranged in connection with the combustion engine and the electrical storage medium, wherein the at least one first converter is configured for energy conversion between the at least one hydraulic element and the electrical storage medium, a transmission coupled between the combustion engine and the at least one first converter for allowing gearing between the combustion engine and the at least one first converter, and at least one one-way coupling arranged between the combustion engine and the at least one hydraulic element, wherein the arrangement, during operation of the combustion engine, is configured to operate the at least one hydraulic element via the at least one one-way coupling, and wherein the arrangement, during operation of the electrical storage medium, is configured to operate the at least one hydraulic element via the at least one first converter, at least one wheel, wherein the electrical storage medium is coupled to at least one of the at least one wheel, and at least one second converter arranged between the at least one wheel and the electrical storage medium and configured for energy conversion between the at least one wheel and the electrical storage medium, and at least one transducer unit arranged between the electrical storage medium and the at least one second converter and configured for inversion and/or frequency modulation of electrical signals from the electrical storage medium to the at least one second converter, and a brake system comprising the at least one second converter and the at least one transducer unit, wherein the brake system is configured to convert mechanical braking power of the wheel arrangement into electrical energy, and to feed the electrical energy to the electrical storage medium.