A power plant shell is a crucial component of any power generation facility. It acts as the outer layer or casing that protects the internal machinery, equipment and systems from the external environment. There are several synonyms or alternative terms that are commonly used to refer to a power plant shell, including power station enclosure, plant housing, generating unit casing, power plant cover, generator enclosure, power unit casing, and power plant housing. These terms are used interchangeably and all refer to the same thing; the outer enclosure of a power plant facility that keeps the internal systems safe and secure.