Yes, high-tension power lines do emit electromagnetic radiation. When electric current flows through power lines, it creates a magnetic field around the lines. This magnetic field generates electromagnetic radiation in the form of radio waves, which include both electric and magnetic components.
The level of electromagnetic radiation emitted by high-tension power lines depends on several factors, including the amount of current flowing through the lines, the voltage level, and the distance from the power lines. The strength of the magnetic field decreases with distance, so the intensity of the electromagnetic radiation is typically highest closer to the power lines and decreases as you move further away.
It's important to note that the electromagnetic radiation emitted by high-tension power lines is generally considered to be low-frequency radiation, typically in the range of 50 to 60 hertz (Hz). This is significantly lower in frequency than other forms of electromagnetic radiation, such as radio waves, microwaves, and X-rays.
There has been ongoing research and debate about the potential health effects of exposure to electromagnetic fields (EMFs) emitted by power lines. However, the scientific consensus, as determined by organizations such as the World Health Organization (WHO) and the International Commission on Non-Ionizing Radiation Protection (ICNIRP), is that there is currently no conclusive evidence to establish a causal relationship between exposure to low-frequency electromagnetic fields from power lines and adverse health effects.