Energy efficiency simply means reducing energy consumption by using less energy to perform the same task. For example, by installing solar panels you are using less energy since you depend less on fossil fuels and instead are using renewable energy like solar energy to perform the same task.
The benefits of energy efficiency include reducing greenhouse gas emissions, energy costs, and the demand for energy imports, but also improving competitiveness in our businesses. By using more energy-efficient technologies and processes, the world can cut its energy consumption by one-third by 2050. Energy efficiency can be achieved through making energy-efficient homes and buildings, vehicles, appliances, and through human behavior (how people properly use these energy-efficient technologies and designs).