This (actually rather common) phrase condenses the idea down so much, that you might want to add a word or two:

- is an infectiously energetic person (worker)
- has an infectiously energetic personality
- is full of infectious energy
- works with infectious energy
... or, just plain "is infectiously energetic"

A couple of examples:
"Great motivational speakers like Tony Robbins have infectious energy."
http://vocabulary-vocabulary.com/dictionary/infectious.php
"Business woman, hotelier, singer, entertainer, philanthropist, antiques collector, mother and grandmother! Though most people would regard such myriad titles and responsibilities as a burden, to infectiously energetic Kamala Sukosol, each of these roles..."
http://www.siamhotels.com/social-en.html