This is the 1128th most frequent Russian word.
энергии
The Russian word "энергии" means "energy" (genitive singular or nominative plural form).
Here, 'энергии' is used to denote physical vitality and strength available to the speaker.
Я чувствую прилив энергии после утренней тренировки.
I feel a surge of energy after my morning workout.
In this sentence, 'энергии' refers to electrical power derived from a physical source.
Солнечные панели преобразуют свет в электрическую энергию.
Solar panels convert light into electrical energy.
Here, 'энергии' signifies cognitive effort and focus required for a task.