2 Electrical signals with same amplitude superimpose on each other with varying phase angles and create a much higher resultant power than the total power of 2 dividual signals.

Depends on the phase angle :

Superimpose 2 signals of equal power can result in 4 times the individual power

Superimpose 3 signals of equal power can result in 9 times the individual power

And so on, N signals of equal power can result in N x N times the individual power

It fits into the picture of how Probability Amplitudes behave.