Gazprom said stopping another turbine at the Nord Stream one pipeline would cut daily gas production to twenty percent halving the current level of supply.
The German government said there was no technical reason to limit gas supply.
It is likely to make it more difficult for EU countries to replenish their stores of gas before winter.
The Nord Stream one pipeline, which pumps gas from Russia to Germany, has been running well below capacity for weeks, and was completely shut down for a ten-day maintenance break earlier this month.
Russia supplied the EU with forty percent of its gas last year, and the EU has accused Russia of using energy as a weapon.
