We examine the clock angle dependence of the solar wind power input into the magnetosphere using the Grand Unified Magnetosphere Ionosphere Coupling Simulation (GUMICS-4). We compute the power input through the magnetopause systematically in four events where the solar wind parameters are otherwise kept constant, but the interplanetary magnetic field (IMF) clock angle $theta$ is rotated from 0¿ to 360¿. We find that when the clock angle rotates from north to south, the power input is well represented by sin2($theta$/2). However, during the return rotation from south to north, the power input in the simulation remains enhanced longer than a sin2($theta$/2) dependence would indicate. We suggest that the enhanced energy input during the return rotation may be a consequence of the nature of the reconnection process at the magnetopause.