1.
If you say that someone or something has ~, you are expressing approval of the fact that they are full of energy or full of new and exciting ideas.
...a situation that calls for ~ and new thinking.
= energy
N-UNCOUNT approval
2.
If you refer to the ~ of a situation or system, you are referring to the fact that it is changing in an exciting and dramatic way.
Such changes are indicators of economic ~.
N-UNCOUNT approval