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Underground energy lines are beneficial to a city for many reasons, firstly, because they have less of a visual and environmental impact, which typically generates large opposition from local communities. Another benefit is that they have lower transmission losses and can absorb emergency power loads. They also have lower maintenance costs, emit no electric field and can be engineered to emit a lower magnetic field than an overhead line. They take up a narrower amount of land to install and are less susceptible to the impacts of severe weather. The disadvantages are that the initial costs are high, and if there is a malfunction, it can be more difficult to repair.
This FACT indicates the percentage of underground energy transmission networks in each state. The state with the highest percentage of underground is the Northern Territory, at 30.87 percent. The state with the lowest is Tasmania, at 7.80 percent. The data is from the years 2009 to 2010.