Energy efficiency refers to the practice of using less energy to perform the same task or provide the same service, thereby reducing energy waste. It involves optimizing technology, systems, and practices to achieve more with less.

For example, energy-efficient appliances and lighting consume less power while delivering the same performance as their less efficient counterparts. Improving energy efficiency can significantly lower energy bills, reduce environmental impact, and decrease dependence on fossil fuels.

It is a key strategy in addressing climate change, as it helps to cut greenhouse gas emissions by minimizing energy consumption. Energy efficiency measures can be implemented in various sectors, including residential, commercial, and industrial, and often involve upgrades such as better insulation, more efficient heating and cooling systems, and advanced manufacturing processes.

Investing in energy efficiency not only supports sustainability but also enhances economic resilience by reducing energy costs and promoting technological innovation.