Definition

The energy industry is the totality of all of the industries involved in the production and sale of energy, including fuel extraction, manufacturing, refining and distribution. Modern society consumes large amounts of fuel, and the energy industry is a crucial part of the infrastructure and maintenance of society in almost all countries. This includes the petroleum industry, gas industry, electrical power industry, coal industry, nuclear power industry, renewable energy industry and traditional energy such as firewood - the total of the energy produced and output from these industries sums to industrial energy output (Wikipedia)