A major issue in future smart grid is how intelligent devices and independent producers can respectively change their power consumption/production to achieve near maximum efficiency for the power network. Limited communications between devices, producers etc. necessitates an approach where the elements of the network can act in an autonomous manner with limited information/communications yet achieve near optimal performance. In this talk, I will present our recent work on distributed energy management with limited communication. In particular, I will show how we can use one-way communication with quantization to coordinate energy consumption among different users. We will investigate the minimum amount of communication for achieving the optimal energy management and study how the quantization affects the convergence rate of the distributed algorithms.