This thesis highlights the importance of solar energy in Algeria and how to invest in this sector (programs and costs). It also examines the laws enacted by the state to protect this sector and includes a case study of three provinces(Constantine, Algiers, and Adrar)to compare solar energy capacity in different locations across Algeria. This comparison aims to identify the most suitable locations for investing in solar power generation. We then conclude that Algeria possesses high solar energy potential in all its sectors, and that the desert regions have even greater potential that must be utilized.