Forecasting is a crucial task for successfully integrating photovoltaic (PV) output power into the grid. The design of accurate photovoltaic output forecasters remains a challenging issue, particularly for multistep-ahead prediction. Accurate PV output power forecasting is critical in
a number of applications, such as micro-grids (MGs), energy optimization and management, PV integrated in smart buildings, and electrical vehicle chartering. Over the last decade, a vast literature has been produced on this topic, investigating numerical and probabilistic methods, physical models,
and artificial intelligence (AI) techniques. This paper aims at providing a complete and critical review
on the recent applications of AI techniques; we will focus particularly on machine learning (ML),
deep learning (DL), and hybrid methods, as these branches of AI are becoming increasingly attractive.
Special attention will be paid to the recent development of the application of DL, as well as to the
future trends in this topic
