Energy efficiency is the practice of using less energy to perform the same function or achieve the same outcome. It involves reducing the amount of energy required to produce goods and services while maintaining the same level of output. Energy efficiency is an essential component of sustainable development and is critical for reducing greenhouse gas emissions, enhancing energy security, and promoting economic growth.

Energy efficiency is also vital in achieving carbon dioxide net-zero emissions through decarbonization. Energy efficiency is a crucial objective in the Clean Energy Package adopted in 2018-2019 in the scope of EU strategy on energy system integration. By itself, the EU strategy on energy system integration is one of the critical tasks in delivering the European Green Deal, which aims to make Europe the first climate-neutral continent in the world. The EU has set binding targets of increasing energy efficiency over current levels by at least 32.5% by 2030.