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The network of smart grid communications (SGC) is expected to be heterogeneous for providing diverse access interfaces. Load balancing is one of the key technologies in such heterogeneous networks, which can increase the system throughput as well as quality of service (QoS). In this paper, a context-aware load-balancing scheme is proposed for SGC networks by virtue of an adaptive trigger threshold. We investigate the characteristics of different kinds of services in the wireless local access network (WLAN) and Long Term Evolution (LTE). Simulation results show that our proposed load balance algorithm achieves better fairness and thus improves the overall throughput.