Global electricity demand is increasing every year. New services appear on the market in order to make our daily life easier. Decarbonization in transport sector makes electric vehicles more popular. Those electric vehicles are considered new demand in electricity sector. New power plants are to be built in order to serve those increasing demand. Due to climate change and global warming, many countries tend to increase the share of renewable energy. Those renewable power plants such as wind and photovoltaic tend to be, not only unpredictable, but also, distributed generation. They tend to be a number of small-scale power plants which are installed close to the loads in order to reduce the transmission losses. This high number of small-scale power plants makes it more challenging to manage. With all these challenges, the electrical grid must be smarter in order to cope with the increasing demand and also be able to balance between power demand side and power supply side. It should be monitored and be able make real-time adjustment in order to deliver electricity efficiently with standard power security and power quality to consumers.There are various types of smart grid technologies that can contribute directly to the reduction of electricity production cost. The reduction of peak demand is the key. Smart grid technologies such as Home energy management system, utility-scale battery storage system, and vehicle-to-grid are investigated in this master thesis in order to reduce the peak demand.