The combination of energy technologies with their respective installed capacities is called the energy mix. The capacity or size of the energy technology is defined in terms of kW or MW  for generation technologies and kWh or MWh for storage technologies. The energy mix is illustrated below shows that electricity can be coming from multiple sources. In this example, the electricity demand is fulfilled by solar, wind and electricity from the grid. The energy mix can affect the sustainability of the project.  For example, the sizes of the energy technologies cannot be too high that will make the project expensive and the electricity cost unaffordable for the consumers. It cannot also be too low as the energy demand and expectations of the community will not be satisfied. Thus, there is an optimal energy mix and there are available methodologies and software tools to solve and determine this.<\/p>\n\n\n\n