Download Electric Substation ( Power Grid ) FREE Unity. 

All of the models are based on reference images that were taken of a real-life substation, so the props are very authentic and close to their real-life counterparts.

Materials are all PBR configured ( albedo / metal / roughness / normal ).

This package comes with a pre-assembled substation but you can create your own using the variety of props included in the pack.
With over a dozen props, you can make a very unique looking substation.

All props come with custom made collision meshes that are accurate and optimized for gameplay.
Polygon counts are kept to a minimum and I used tricks to maintain the visual fidelity without using too many polygons ( for example, I used alpha masked texture to model the ribbed towers, saving a lot of triangles, while still maintaining authentic visual style ).