In this paper, generalized active disturbance rejection control (GADRC) technique in the presence of communication delay is proposed for load frequency control of a hybrid microgrid system, which is composed of renewable energy sources such as solar and wind input, energy storage devices such as battery energy storage system and flywheel energy storage system as well as fuel cell and diesel generator which are controllable sources of energy. The presence of communication delay involved in transmission of control signals is also considered for controller design. Further, the robustness of proposed scheme is investigated via an elaborate study comprising of varying communication delay, parametric uncertainty, nonlinearities such as generation rate constraint and governor deadband, as well as mismatch in communication delay between the inputs of observer. Finally, the performance indices of the proposed scheme are compared with conventional and fractional order based controller design approaches. The simulation results are a testimony to the efficacy of proposed scheme.