Efficient energy use, often known as energy efficiency, is the goal of reducing the quantity of energy necessary to provide goods and services while also reducing the consequences of pollution on the environment. There are numerous reasons to increase energy efficiency. Reduced energy consumption lowers energy expenses and may result in a financial savings for consumers if the energy savings offset any additional costs associated with deploying energy-efficient technologies. Reducing energy use is also seen as a means of reducing greenhouse gas emissions. From the discovery and development of primary energy resources to power generation and oil refineries, to electricity grids, to final application in industry, buildings, and transportation, energy efficient technology may be found throughout the energy conversion chain.