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This paper investigates a power-efficient simultaneous wireless information and power transfer (SWIPT)-enabled reconfigurable intelligent surface (RIS)-assisted multi-input multi-output (MIMO) communication network, where a multiple antenna base station (BS) communicates with multiple information and energy receivers simultaneously with the aid of a RIS. To jointly optimize the active and passive beamforming, a transmit power minimization problem is formulated subject to minimum rate and harvested energy requirements at respective users. Due to non-convex nature of the formulated problem, we adopt the mean squared error (MSE)-based approach to convert it into a convex one. Next, we propose an iterative algorithm to determine the optimal active and passive beamforming matrices. Finally, simulation results are presented to validate the effectiveness of the proposed algorithm and highlights the impact …