This is the 13489th most frequent Russian word.
нарастает
"Нарастает" means "is increasing" or "is growing."
The word 'нарастает' here is used to describe the gradual increase of anxiety over time.
Тревога нарастает с каждой минутой.
Anxiety is growing with each passing minute.
In this context, 'нарастает' refers to the seasonal increment or rise in demand.
В зимний сезон спрос на электроэнергию нарастает.
During the winter season, the demand for electricity increases.
This usage of 'нарастает' indicates the buildup of emotional or environmental tension.