Mild is called the technology that exploits the renewable sources of energy, those which never run dry, as the bio energy, the Aeolian energy, the energy of waves, the solar energy, the waterfalls, geothermic, the energy of animals, the combustion of timbers etc. Moreover, mild is the technology which uses, with outstanding frugality and a lot of caution the modern methods, the modern materials, the modern discoveries, the impetuous use of which leads to pollution and destruction. The alternative technology and the utilisation of equipment materials and methods friendly to the environment are not the panacea that will solve the problem of the planet. However, they are capable to materialize innovative work and important actions for the distribution and consolidation of new energy technologies for the protection of the environment and the sustainable development.