Germany's gas storage facilities were replenished slightly overnight despite a significant cut in supplies from Russia, the country's grid regulator said on Saturday, but confirmed that the gas supply situation remains "tight."

Saturday's gas storage rate was 56.67%, up slightly from Friday's 56.29%, German grid regulator Bundesnetzagentur said in its daily gas supply report, reiterating its call to conserve as much gas as possible.

The German government has urged businesses and households to reduce their gas consumption to a minimum in order to ensure sufficient storage levels before the start of the heating season in about 12 weeks.

Earlier this week, Russia limited supplies via the Nord Stream 1 gas pipeline to about 40% of its capacity, which Moscow blamed on delaying equipment stuck in Canada for maintenance.

Germany, which consumes most of its fuel from Russian gas, questioned this explanation and said Russia's actions were politically motivated to make it harder to fill the storage facilities.

Bundesnetzagentur President Klaus Müller said late on Friday that even if Germany's gas storage facilities were 100% full, that would only last 2.5 months if Russia completely cut off supplies.