Algeria is favorably positioned in terms of geothermal resources for low and medium enthalpy. The northern part of Algeria is characterized by a complex geology and alpine-type volcanism in the Mio-Pliocene-Quaternary, while the South has a structure much simpler and more regular. More than 200 springs are identified on the territory of Algeria with temperatures of 68 ° C in the West, 40 ° C at the Center, 96°C in the East and 60°C in the South. Geothermal reservoirs are relatively interesting and diverse. They occur both north and south and consist of dolomite Tlemcenian in the west, carbonate formations in the East and Albian sandstones in the Sahara. Today, geothermal resources of Algeria are used in spas, heating greenhouses and irrigation. Others use successful applications made by including geothermal heat buildings (heating and air conditioning), drying fruits and vegetables, aquaculture, desalination of seawater and brackish water algae production blue green (spirulina) in fish farms. Such applications reduce dependence upon fossil resources (oil). They are very reliable and cost-effective and suitable for the sustainable development of the environment.