This Recommendation has been developed to introduce highly-efficient infrastructure solutions, including highly-efficient power solutions, renewable energy solutions, air-conditioning energy saving solutions and free and economized cooling solutions. Not every solution mentioned in this Recommendation is fit for everywhere. When operators choose the solution, it should be selected according to local situations. With the development of information and communication technologies, and especially high power-density equipment, the energy consumption of communication industry is increasing. Therefore, we must pay attention to energy conservation, and protection of the environment. This Recommendation specifies Green ICT solutions for telecom network facilities.