Nova Scotia's transmission lines operate at 69 kV, 138 kV, 230 kV or 345 kV.
They range from a few kilometres long in urban situations to hundreds of kilometres in length for lines carrying power from distant generating plants. All of North America is interconnected. Read more
Every transmission (and distribution) system suffers line losses of between 6% and 8%. Whenever electricity passes along wires or through substations, it encounters resistance and loses some of its energy to heat.