4.4.1. Different Encoders

We evaluated the impact of different encoders by keeping only one of the encoders from DualET. As shown in Table 2, the proposed model with only the LSI encoder is better than that with only the RSI encoder. As previously mentioned, the LSI encoder is used to learn historical seasonal information from local measurements, while the RSI encoder is to learn cloud information from satellite images. Therefore, this indicates that the fluctuation features of PV power are more contained in local measurements compared with cloud images. Meanwhile, we can see that the model with dual encoders yields the best results compared with that with only one, which shows that cloud images can provide valuable information for performance improvement and further shows the effectiveness of our dual-encoder design.

**Table 2.** Comparison of different encoders.

