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As AI models grow in complexity, precision, and computational power, their energy consumption rises exponentially, raising serious concerns about the sustainability of their widespread adoption. The field of green learning aims to mitigate these concerns by developing energy-efficient AI solutions. In this work, we propose a method to preserve the accuracy of photovoltaic (PV) power generation forecasting while reducing the environmental impact through dataset size reduction. Our approach employs a heuristic strategy that iteratively reduces the training dataset until a cutoff point is reached, balancing predictive accuracy and environmental efficiency. Experimental results using publicly available PV generation datasets demonstrate that the proposed data reduction method decreases training time by up to 17.13%, with only a 1.47% decline in prediction accuracy. 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