The energy sector includes companies involved in the exploration and development of oil or gas reserves, oil and gas drilling, and refining. The energy industry also includes integrated power utility companies such as renewable energy and coal.

• The energy sector includes corporations that primarily are in the business of producing or supplying energy such as fossil fuels or renewables.
• The energy sector has been an important driver of industrial growth over the past century, providing fuel to power the rest of the economy.
• Companies in the energy industry are classified based on how the energy is sourced such as non-renewables or fossil fuels and renewables such as solar.