In order for the electrical outlets in our homes to function, they must receive electricity from a power plant. A power plant produces a certain amount of electricity that is then transported by high-tension power lines to substations near residential areas. In order for the electricity to reach the substation economically, it is put through a transformer that increases the voltage to between 66 kilovolts and 765 kilovolts. These voltages make it more efficient to transport electricity over long distances without loss of energy. There are problems associated with such large voltages being channeled through power lines.
Fires can start if trees are too close to such lines.
There are mandated guidelines for the distances that must exist between trees and high-tension power lines. Another serious problem is the occurrence of electromagnetic fields within 20 meters of high-tension power lines. They have been suspected to cause cancer in people living in the immediate vicinity of power lines. Steps have been taken to prevent this, but an alternate method of transmitting electricity over long distances has not been found. In addition, the obvious and perceptible danger of electrocution exists when people or animals get near the power lines.