As a career electrical engineer I am getting increasingly disturbed at the incorrect usage of the term kW for energy storage where the correct term is kWh. 

A kW (kilo Watt) is a unit of power, while kWh (kilo Watt hour) is a unit of energy. They are NOT compatible units.
 

The use of KW or MW is quite deceptive when discussing energy storage.  For example, California's mandate of 1,325 MW in operation by 2024.  What does that really mean? Is a 1 MW flywheel that provides energy for a few seconds the same as a 1 MW battery that provides power for an hour.  

The language is very imprecise.  It may better if energy storage were expressed in how long a technology provided a minimum amount of energy.  For example,  if the standard were 1 KW.  The storage level would be expressed as, this technoloy provides a mimimum of 1 KWhr for 3 hours.