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In recent years, the ever-increasing demand on electricity cannot be followed by the amount of energy supply mainly produced from fossil. In order to mitigate this issue, many researches have been conducted in the field of renewable energy (RE), which aims at reducing the dependence on fossil based energy. In Indonesia, one form of RE that has a promising potential is solar power. Unfortunately, solar power has intermittent nature and thus, the output of RE plants (solar power plants) tends to be unpredictable. It has been found that there is a linear relationship between the amount of solar irradiation and the power produced by the solar power plants. This linear relationship can be exploited to predict the power produced by the solar power plant by performing forecasting on the amount of solar irradiation. This paper discusses three methods for forecasting solar irradiation. The first forecasting method discussed …