Abstract: A method of gas generation resides in transformation of a cryogenic agent, capable of passing to the supercritical state, from the liquid state to the gaseous state thereof by way of thermoinversion in an isochoric process with enhancement of the potential energy of pressure of the gaseous medium thus obtained, and reducing the shaped gas stream, this being followed by gasdynamic ejection of the ambient medium. A plant for effecting the method comprises a source of a working medium (a cryogenic agent), at least one chamber (1,2), a gas reducer (29) and a gas ejector (24), arranged in succession downstream and communicating with each other.