An exemplary power plant construction is configured to accommodate an internal combustion engine and a generator driven by the internal combustion engine, and includes a front wall, a rear wall and side walls, at least the side walls being modular walls having at least two wall modules arranged one upon the other, the wall modules being self-supporting modules having a shape of a rectangular prism, wherein the wall modules arranged one upon the other form a self-supporting wall, and wherein the uppermost wall module of each side wall includes a beam that is parallel to the longitudinal direction of the side walls and configured to function as a runway beam of an overhead crane.