What is net energy?

Net energy is the amount of usable energy that is available after the energy used to extract, process, and distribute energy sources is accounted for. It is a measure of the efficiency of energy production and consumption. For example, when calculating the net energy of a gasoline-powered car, the energy needed to extract and refine the oil, transport it to gas stations, and power the vehicle is subtracted from the total energy contained in the gasoline.

Net energy is an important concept in assessing the sustainability and environmental impact of different energy sources. Energy sources with a high net energy yield, such as wind and solar power, are considered more sustainable and environmentally friendly compared to energy sources with a low net energy yield, such as fossil fuels. This is because high net energy sources require less energy input to produce the same amount of energy output, resulting in lower overall environmental impact.

In conclusion, understanding net energy is crucial in evaluating the efficiency and sustainability of different energy sources and guiding decision-making towards more sustainable energy practices.