Energy borrowing (EB) technique has been proposed recently to improve the performance of wireless communications, which also decreases the burden of the smart grid (SG). To further reduce the burden of SG, we propose an energy depositing (ED) strategy. Specifically, the energy harvesting (EH) device can deposit its unused energy in the SG for decreasing the burden of SG, and it also can extract the deposited energy with additional amount of energy as incentive. An EB-and-ED structure is also proposed to promote a more energy-efficient wireless system. This paper focuses on the ED process, a joint optimization of both ED policy and power scheduling for maximizing the system throughput has been formulated. The simulation results using real solar irradiance data confirm the effectiveness of the proposed ED strategy.