Distributed antenna systems (DAS) are known to improve coverage and performance of wireless communications in indoor environments. In this work, the energy efficiency of a DAS using radio over fiber (RoF) are evaluated and compared with those in a centralized antenna system. The power consumption of a Wi-Fi access point and dongle are measured to compute simulations using distance-dependent energy efficiency model. The simulations show that a distributed system with four antennas is almost 2 times more energy-efficient than a centralized antenna.