IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-ISSN: 2278-2834,p- ISSN: 2278-8735.Volume 15, Issue 3, Ser. II (May - June 2020), PP 01-12 www.iosrjournals.org DOI: 10.9790/2834-1503020112 www.iosrjournals.org 1 | Page Energy Storage in Communications & Data Center Infrastructures M. Dubarry, G. Baure, C. Pastor-Fernandez, T. Fai Yu, W. DhammikaWidanage, J. Marco, S. Koohi-Fayegh, S. Abdel Aleem, S. Ali, Z. Ali, A. Abedelaziz, M. Hassan L-F Pau, CBS / Erasmus University / UpgötvaAB Abstract: As communications technology is ubiquitous, and energy savings are ever more crucial in communications and data storage infrastructures, it is timely to revisit the technologies used for energy storage. Thismultidisciplinary paper especially focusses on the specific requirements onto energy storage for communications and data storage,derived from traffic, climate, high availability, and resilience, irrespective from energy sources used. It also addresses techno-economic, environmental &emissions tradeoffs offered by a model, and concludes with discussing future energy storage technologies. Keywords: Energy storage, Communications networks, Data centers, Batteries, Battery power loss, AD-DC power conversion, Life-cycle costs, Environmental life-cycle cost, Emissions life-cycle cost --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 01-06-2020 Date of Acceptance: 16-06-2020 --------------------------------------------------------------------------------------------------------------------------------------- PLAN 1. Introduction: specific requirements 2. Redundancies in telecommunications flows affecting power requirements and consumption 3. Energy storage techno-economic trade-offs 4. Energy storage environmental and emissions tradeoffs 5. Communications networks infrastructure as a distributed energy storage grid 6. Characteristics of energy storage technologies for communications nodes 7. Efficiency in AC-DC power conversion 8. Monitoring of battery power loss 9. Energy storage in computing clouds 10. Future energy storage technologies for communications networks and data centers References I. Introduction: Specific Requirements Energy storage for communications networks and data centers have highly unpredictable demands(due to the nature of the traffic requests and services rendered), much higher than electricity grids [17]. But the energy storage does not serve, as in the electrical grid or with renewable energy sources, to level the load except in case of power failure... The second distinguishing characteristic is thatfor the end user in modern societies, availabilityand resilience of communications networks and data centers must be extremely high, higher than the availability of electricity grids which serve as their main energy source. The third characteristic is that energy storage for communications and data infrastructure is normally placed on the same premises as communications nodes, to reduce the risks due to electrical power transmission failures. Energy storage also often needs to be autonomous for some rather long durations, as these premises may be on inaccessible sites where they cannot be resupplied easily. Therefore, energy storage for communications networks and data centres carries out ancillary services: -provides operating reserve power; -ensures power quality for devices such as voltage regulators, rectifiers and uninterrupted power systems (UPS); -providesback-up or black start energy services to compensate for partial or full electrical grid blackouts, as well as to keep on “hot stand-by” some equipmentused as active spares. As a result, the power injection request from communications nodes can be instantaneous, while the typical discharge time for energy storage for communications and data centers, is in hours or a few days at most,