When potential energy is released, it always converts to kinetic energy, and kinetic energy is required for an item to store energy as potential in some form. 

A rock on the edge of a cliff, for example, does not require kinetic energy to store the potential energy that will propel it down the cliff face. 

However, kinetic energy is required to get the rock to the edge. 

As a result, the rock requires it in order to maintain its potential energy.