1. Electrical power energy conservation system comprising: single or multiple alternating current electrical motors serving pumps, fans, and various equipment and processes, that can be controlled by a variable frequency and speed drive mode or a constant frequency and speed drive mode; a motor drive is provided with a power demand control means for adjusting the frequency and the speed of the motor drive to follow the load variation so that power used by the motor is minimized; means to monitor and control the motor power demand and electrical usage at variable and constant frequency and speed modes; means to monitor and control the motor load at variable and constant frequency and speed modes; means to bypass variable and constant frequency and speed modes; means to monitor and control the periodicity and timing of switching the motor frequency and speed modes; means to determine the power demand operating point of equilibrium for the electrical motor mode switching control.