Journal of Network Communications and Emerging Technologies (JNCET) Volume 10, Issue 4, April (2020) ISSN: 2395-5317 ©EverScience Publications 1 Energy Efficiency in Green Data Centers: A Review Tejaswini T N Department of Information Science and Engineering, BMS College of Engineering, Bangalore, India. tejunagraj12@gmail.com Pooja V Raikar Department of Information Science and Engineering, BMS College of Engineering, Bangalore, India. poojavraikar@gmail.com Shruti H Hegde Department of Information Science and Engineering, BMS College of Engineering, Bangalore, India. shrutihhegde@gmail.com Nalina V Department of Information Science and Engineering, BMS College of Engineering, Bangalore, India. nalinav.ise@bmsce.ac.in Published online: 30 April 2020 Abstract – Energy consumption is increasing globally day by day. Due to this Greenhouse Gases are badly impacting our environment. Because of drastic growth and usage of the internet, energy consumption in data centers increased exponentially. There are problems related to computer systems which include the energy consumption, exhausted emissions, building resources, high maintenance costs, global warming and high-water enterprise. To avoid these problems, we have to take care of Data Centers. There are many ways through which can lower the energy wastage, electricity cost. The creation of the Green Data Center is necessary. Green data centers are sustainable. Research has been done related to energy tinctures and hike in the cost of energy. Efficiency of data centers matters the most. This paper discusses the data centers, problems faced by them, techniques to improve those problems. This paper also explains the various systems which could be used in data centers to avoid energy wastage, cost crisis. Index Terms – Power usage effectiveness, Green metrics, Optimization, VCG mechanism, Green Grids, Resource Management, Energy Efficiency 1. INTRODUCTION Human the principal reason for various pollution. When the earth’s temperature rises above the average temperature of the surface that will lead to global warming [1]. The main reason for the increase in temperature is due to the climate change. There are various reasons for climate change they are deforestation, soil erosion, volcanic eruptions, Greenhouse gases (GHG) etc. [2,3]. The main anthropogenic reason for global warming is the emission of Greenhouse gases. The various Greenhouse gases are Water Vapor, Carbon dioxide, Ozone, Nitrous Oxide, Methane, Hydrofluorocarbons and Chlorofluorocarbons. The main causes for the emission of Greenhouse gases include the agricultural practices, livestock manure, more energy is released from the industries, data centers etc. [6]. Around 2% of Greenhouse gases are released from the IT zone that’s why it is very important to minimize the energy released from the data centers [5]. Green computing is the latest trend in the market where the use and manufacture of computers and other computer related equipment are environmentally friendly [4]. To reduce the energy emitted by the data centers, the data centers are turning green by using a green computing method [8, 9]. By using the green computing, the equipment in the data centers can be designed in such a way so that they consume only minimal energy [7]. The study forecasts that in 2011 the global power consumption from the data centers is going to be 1.1%-1.5% and in 2020 it is going to be 8%. The main purpose of Green computing is to lower the emission of carbon gas which is a GHG. It’s very necessary to design equipment like cooling systems, servers, power backup systems, network equipment and storage eco-friendly [10]. 2. LITERATURE SURVEY Hazril et al. [1] presented, as the demand for data centers are increasing, the energy consumption by them is also significantly rising. In order to reduce the energy consumption one can, implement Green Data Centers which uses Green computing. Green computing involves scheming a computer that contemplates both energy efficiency and processing performance. The study proves that there is an increase of 1.1% - 1.5% yearly in the energy consumption of DC if this continues then there is a chance of an increase in energy cost also. To increase the reliability of the system the DC machinist increases the capacity of their UPS system which reduces the energy efficiency of data centers. The improvement in the underutilized equipment in the data centers contributes to