The Canadian move comes before Nord Stream 1 is due to shut down for annual maintenance on Monday. In previous summers, the work led to a roughly 10-day shutdown, but German Vice Chancellor Robert Habeck has said he suspects that Russia may cite "some little technical detail" as a reason not to resume gas deliveries.
The reduction in gas flows comes as Germany and the rest of Europe try to reduce their dependence on Russian energy imports. Germany, which has Europe’s biggest economy, gets about 35% of its gas to power industry and generate electricity from Russia.
Last month, Habeck activated the second phase of Germany's three-stage emergency plan for natural gas supplies, warning that Europe's biggest economy faced a "crisis" and storage targets for the winter were at risk.
On Friday, energy company Uniper — Germany's biggest importer of Russian gas — asked the government for a bailout to cope with surging gas prices.