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In keeping with green IT, we propose reusing obsolete older-model PCs as a grid to create a high performance environment consisting of ordinary PCs. However, such a grid has continuous energy requirements, which is undesirable in terms of environmental concerns, due to the increased CO2 emissions from generating the required electricity. Therefore, this study aims to realize a grid powered by solar power to overcome the disadvantage, while reusing obsolete older model PCs. In this paper, we propose a means of operating a grid system powered by photovoltaics using weather reports to operate the system effectively and validate the proposal through simulations.