Mobile Distribution Substations are used by electric utilities to bridge the gap during a substation outage, either during a planned outage or one caused by storm damage. This unit "steps-down" the power from the main transmission lines to a lower voltage more suitable for residential and small business use.
Quoting Tom Simon
Excellent work! First, a great looking model. Second, refreshing subject. Kudos.
I have worked for an electric company for 15 years and I didnt even know that these existed until 3 weeks ago. They did a feature video on mobile substations on one of our corporate internal websites. Why did I build it? Well, I have always wanted to build an electric substation and then when I saw this I thought for sure no one had ever created one in LEGO, so I had to go for it!