: Focuses on energy systems, conservation methods, and end-use efficiency. Features & Structure

: Articles are arranged A–Z and typically include a glossary of terms, a "Defining Statement," and suggestions for further reading.

: Includes an extensive chronology of energy developments, international organization listings, and tables for physical property data and production figures.

: Designed for academics, researchers, and students, as well as policy makers and business professionals.

The work draws from natural, social, and engineering sciences to cover the following themes: