Cloud computing is emerging technology as a critical information communication technology to heavily impact our day-to-day life in the future. As computing becomes increasingly pervasive, the energy consumption attributable to computing is climbing that marked the foundation of Green Cloud Computing. Green Cloud Computing', the word green with cloud computing denotes that this is environment-friendly. The concept is to reduce energy consumption and reduce the waste disposed to the environment. To reduce energy consumption, cloud computing is exploring energy-efficient ways of working. A Green Cloud System responds to peak utilization periods and adjusts the availability of resources based on expanding or shrinking the cloud as needed.