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Cloud computing gaining popularity at enormous rate since from its emergence. CC changed the way that computing services are provided. On demand platform (PaaS), infrastructure as a service (Iaas) and software (SaaS) as a service through internet. Consumer use third party services instead of building his own infrastructure which need up-front investment and expertise. Cloud computing becoming popular for unlimited computing ower, availability, nice pricing, on demand services and quality of service. For availability and computing power the service provider expands their resource capacity to handle user requirements. This expansion in resources capacity lead to high energy demand. Two big issues for cloud computing is energy demand and security/privacy requirements. In this survey we will give a review on the latest techniques for energy efficiency in cloud computing. The main focus is on software base energy efficiency techniques in which we will explain the workload consolidation and resource management in detail.