Aquae Calidae, Algeria importance. Augustus even founded -in what is now coastal Algeria- the following Roman colonies: Igilgili, Saldae, Tubusuctu, Rusazu, Rusguniae, Zuccabar, Thuburnica and Gunugu. All these colonies were connected to Aquae Calidae in a military way with strong commercial links. The importance of Aquae Calidae -as the name indicated- was from the warm waters (reaching nearly 50 C.) that were used for the local famous roman thermae During the centuries of Roman domination Aquae Calidae was a small but rich city with a Forum, theater, baths, library and aqueducts, but nearly all has disappeared. Only a necropolis of the city walls
Geothermal energy a renewable energy source like geothermal. But as a result of government assisted research and industry experience, the cost of generating geothermal power has decreased by 25% over the past two decades. In 2001, geothermal energy costs between two and ten US cents per kWh. Hot springs have been used for bathing at least since Paleolithic times. The oldest known spa is a stone pool on China's Lisan mountain built in the Qin Dynasty in the 3rd century BC, at the same site where the Huaqing Chi palace was later built. In the first century AD, Romans conquered "Aquae Sulis",