Electric power transmission is one process in the transmitting of electricity to consumers. The term refers to the bulk transfer of electrical power from place to place. Typically, power transmission is between the power plant and a substation near a populated area. Due to the large amount of power involved, transmission normally takes place at high voltage (110 kilovolts or above). Electricity is usually transmitted over long distance through overhead power transmission lines.
It is argued by some that living near high voltage power lines presents a danger to animals and humans. Some have claimed that electromagnetic fields from power lines elevate the risk of certain types of cancer. Some studies support this theory, and others do not. Most studies of large populations fail to show a clear correlation between cancer and the proximity of power lines. However, a study done by Oxford University in 2005 demonstrated a statistical association between childhood leukemia and being born near high-voltage power lines. It is not known whether the link is causal or not - the relation may be due to chance or to other factors associated with the presence of power lines. The current mainstream scientific view is that power lines are unlikely to pose an increased risk of cancer or other somatic diseases.
For more information:
Power Lines and Cancer Frequently Asked Questions (FAQ) discussion at http://www.mcw.edu/gcrc/cop/powerlines-cancer-FAQ/toc.html.
The issue is also discussed at some length in the background paper on “Power Line Fields and Public Health” which can be found at http://www.calpoly.edu/~dhafemei/ba
