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The paper presents a new standardized, environmentally friendly, low cost HV/MV distribution substations. The new solution, adopted by ENEL Distribuzione in Italy, is based on the following principles, which are presented and discussed in the paper:-Use of new simplified single-line diagrams and layouts. The substation is supplied from the HV subtrasmission network. The "Y" single-line diagram is chosen, including one or two HV circuit breakers. The substation is usually built under an existing HV line, within the right-of-way (ROW), thereby minimizing disturbance to the environment and facilitating land acquisition.-Almost complete prefabrication. The new type of substation is formed by three components (HV switchgear; HV/MV step-down transformer; MV switchgear), which are fully factory assembled and tested, and easily transportable to site, thereby greatly reducing cost and implementation time.

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