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In this paper, we study the energy efficiency (EE) of a downlink multicell massive distributed antenna system (DAS) in the presence of pilot contamination (PC), where the antennas are clustered on the remote radio heads (RRHs). We employ a practical power consumption model by considering the transmit power, the circuit power, and the backhaul power, in contrast to most of the existing works which focus on colocated antenna systems (CASs), where the backhaul power is negligible. For a given average user rate, we consider the problem of maximizing the EE with respect to the number of antennas of each RRH n, the number of RRHs M, and the number of users K and study the impact of system parameters on the optimal n, M, and K. Specifically, by applying random matrix theory, we derive the closed-form expressions of the optimal n and find the solution of the optimal M and K under a simplified channel …