Currently, data traffic on Internet is growing rapidly and Wireless Access Network has a key role in this context. Communication network is in charge of providing seamless connectivity and great quality of service (QoS) to the end users, and a large amount of energy is involved to accomplish this task. Besides network performance, energy efficiency becomes an important matter. The price of energy from fossil fuel is continuously rising, the risk for depletion in the future is concrete, and the energy provisioning from hydrocarbon has an impact on global CO2 emission. In this context, carbon-low impact alternatives, like renewable energy supply, represent a possible solution.