This is the 18424th most frequent Russian word.
энергетические
"Энергетические" means "energetic" or "related to energy."
Here, 'энергетические' describes resources (ресурсы) related to energy.
Энергетические ресурсы играют ключевую роль в экономике страны.
Energy resources play a key role in the country's economy.
In this case, 'энергетической' is the genitive singular form to agree with the feminine noun отрасли (sector) emphasized by its connection to energy.
Технологии в энергетической отрасли быстро развиваются.
Technologies in the energy sector are rapidly evolving.
Here, 'энергетические' modifies напитки (drinks), indicating a type of drinks formulated to provide energy.