The E.C.O. stores the reactive power to create the electromagnetic field (EMF) around the inductive windings of a motor by storing in its capacitors. As motors operate, reactive power is "pulled" and"pushed" to and from the E.C.O. by the motor at 60 cycles/second.
The E.C.O. stores and releases what the motors need to function more efficiently. This unique approach reduces the heat generated on the lines and therefore reduces the strain placed on all the electrical components so they actually will increase their life expectancy. Electricity that is normally pushed back through the power distribution lines is now reclaimed and recycled by the E.C.O..
The E.C.O. reclaims, stores, recycles and supplies power to all inductive loads (motors). As you have already paid for this electricity, why waste a percentage of your investment. With the E.C.O.  energy can be stored and used when needed. This whole process is called energy optimization.