The industrial combustion plays an important role in the global energy landscape as it accounts for the major share of the worldwide energy consumption. This aspect is further enhanced by the increasing in the demand for electricity. Nonetheless, the world is increasing its awareness on the environmental impact of traditional fossil-fuel-based systems. Thus, in this context a transition towards cleaner and more sustainable energy sources is necessary. In the last decades renewable sources have gained attention as viable alternatives. However, their functioning is related to climatic conditions such as, the presence of sunlight or wind. Unfortunately, these conditions can be intermittent and geographically variable.