This model is in 1/700 scale. It does not require cutting or finishing. It is part of the North Korean Set available from this shop. It can be used to add realism to any diorama.
According to Wikipedia: "A substation is a part of an electrical generation, transmission, and distribution system. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions. Between the generating station and consumer, electric power may flow through several substations at different voltage levels."