Security attacks on smart grid have increased over the last few years. These attacks have led to great economic losses and increase in environmental concerns. The current security posture of the smart grid is inadequate to address all its existing and emerging security attacks. The concept and adoption of Energy Internet (EI) will significantly improve the security of the smart grid. EI is proposed as an integrated platform with multidirectional communication and power flow mechanisms designed for improvement of the smart grid. The IoT technologies are used to collect and analyse real-time data for intelligent energy management. EI ensures that the energy domains such as generation, transmission, distribution, operations, service provider, markets, end-users and regulators are seamlessly integrated. It enables the gradual transition from non-renewable to renewable energy sources [1] [2] [3] which supports energy management initiatives like environmental and economic efficiencies. The concept of EI can also be referred to as a software platform for controlling, monitoring and managing the entire smart grid, with interconnectivity orientation amongst all power systems [4]. It provides new energy efficiencies not limited to intelligent energy management, automatic redirection and adjustment of energy usage, energy security, asset degradation control and availability of smart energy choices to customers. EI is envisaged as the technology to transform the smart grid into a smarter grid via improved technological advancement with the support of IoT for the entire future smart grid system. The IoT is a key enabler for the energy domains [5] in which sensing and actuating are major features of many assets in order to increase operational and communication efficiencies. The capabilities of IoT in EI for adequate energy management supports the efficient detection of security vulnerabilities and attacks. However, due to the complexity nature of the IoT, it is very challenging to design a fully secure and efficient framework to detects and prevents security vulnerabilities and attacks in EI. One of the main features of EI is the ability to use IoT to control and monitor all the activities and functionalities of the smart grid [6]. While the research about EI security has just begun, the importance of security software framework in the energy sector is becoming more prominent. The security attacks on assets, data, network, users and applications are huge challenges for the EI. These security attacks and other challenges such as risk management and network assurance are major security problems that we need to study and solve.