The TGK1 power station located in the Murmansk region reported on June 9 that two of its hydropower units were flooded with “abnormal water inflow” due to melting snow, according to the Moscow Times.

The water levels at TGK1’s Tulomskiye and Serebryanskiye hydropower plants in the Murmansk region saw water levels rise rapidly to unseasonal highs after snow at the Lovozero lake melted — something which occurs once in 1,000 years, according to the company.

TGK1, which is majority owned by Gazprom, has already ordered personnel at the plant to work under an emergency mode. The plant operates in what is supposed to be an area of permafrost.