This is the 914th most frequent Bulgarian word.
енергийна
"Energy-related" or "energetic."
Here, "енергийна" is used as an adjective modifying "политика" (policy), referring to aspects related to energy.
Енергийната политика на страната е ключова за устойчивото развитие.
The energy policy of the country is crucial for sustainable development.
Here, "енергийна" is used as an adjective modifying "ефективност" (efficiency), indicating efficiency in the context of energy usage.
Необходима е повече енергийна ефективност в сградите.
More energy efficiency is needed in buildings.
Here, "енергийния" is the masculine singular definite form of "енергиен" (energy), functioning as an adjective describing "сектор" (sector) in context with energy.