Deutsch: Energieeffizienz / Español: eficiencia energética / Português: eficiência energética / Français: efficacité énergétique / Italiano: efficienza energetica

Energy efficiency are technologies and measures that reduce the amount of electricity and/or Fuel required to do the same work, such as powering homes, offices and industries.

An Energy-efficiency is also the ratio of the energy use by such an article to the useful output of services from an article of industrial equipment; for example, liter per 100 km of the moved vehicle (or in the USA: vehicle miles traveled per gallon of fuel (mpg)).

Energy-efficiency in the environmental context refers to the practice of reducing the amount of energy required to provide products and services. This encompasses a wide range of activities and technologies designed to minimize energy consumption and lessen the environmental impact of energy use.


Energy efficiency is crucial in combating climate change, reducing carbon footprints, and conserving natural resources. It involves improvements in technology, processes, and practices that lead to more efficient energy use, thus decreasing energy demand without compromising service quality. Enhanced energy efficiency helps in significantly reducing greenhouse gas emissions by lowering the dependence on fossil fuels and promoting the use of renewable sources.

Industries and households that adopt energy-efficient technologies can achieve considerable cost savings while also contributing to environmental sustainability. Techniques include upgrading to more efficient heating and cooling systems, using LED lighting, and implementing advanced building insulation. In industrial settings, optimizing machinery and processes can greatly enhance energy efficiency.

Application Areas

Energy efficiency finds application across various sectors, including:

  • Buildings and construction: Implementing energy-efficient designs and materials in new buildings and retrofitting existing structures with energy-saving technologies.
  • Transportation: Developing and using more efficient vehicles, including electric and hybrid cars, and improving driving practices.
  • Manufacturing: Upgrading equipment and optimizing processes to reduce energy consumption in factories.
  • Utility and power generation: Increasing the efficiency of power plants and grid operations to reduce energy losses.

Well-Known Examples

Notable examples of energy efficiency in action include the use of smart thermostats in homes, which adjust heating and cooling based on behavior and weather patterns. Another example is the widespread adoption of LED lighting, which uses significantly less energy than traditional incandescent bulbs.

Treatment and Risks

While the benefits of energy efficiency are substantial, there are challenges and risks involved. Initial costs for upgrading to energy-efficient technologies can be high, though these are typically offset by long-term savings. There is also the risk of the "rebound effect," where the savings from energy efficiency lead to increased energy use elsewhere, potentially negating some of the environmental benefits.

Similar Terms

Related terms include sustainability and renewable energy. Sustainability refers to the broader practice of maintaining resource use at levels that do not harm the environment, while renewable energy focuses on generating power from natural sources that are constantly replenished.



Energy efficiency is a key strategy in reducing environmental impact and promoting sustainable development. It involves adopting technologies and practices that improve the way energy is used, leading to significant environmental and economic benefits.


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