Abstract-Energy buffering, using energy storage devices (ESD), can help to smooth renewable and cut the electricity bill in Internet data centers. Recent works demonstrate the efficiency of this scheme which comes from matching the power demand of servers with low-cost and green power supply by leveraging the long-term variation of workload and renewable. However, given the variation in efficiencies of the ESDs, short term and long term variation in renewable energy, workload and energy pricing a multi-tier management is required to closely match the green and low-cost power availability with the demand. This paper proposes a multi-tier workload and energy buffering management technique that frames each tier as an optimization problem and solves them in an online and proactive way using Receding Horizon Control(RHC). The paper also conducts an analytical study to illustrate the benefits of multi-tier energy buffering management versus one tier energy buffering management in terms of increasing the renewable utilization. Analytical and simulation studies show that multitier energy buffering management can increase the utilization of the renewables as much as two times compared to one-tier management depending on the available renewable energy and power demand magnitude and variation.
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