To wean itself off Russian natural gas, Europe has found new sources of energy, including imports from the United States. But high costs are straining the economy.

At a newly built dock along Germany’s Elbe River, tankers from the United States unload liquefied natural gas to fuel factories and homes. In central Spain, a forest of wind turbines planted atop mountains helps power the energy grid. In French government buildings, thermostats have been lowered in winter to save electricity.

In the three years since Russia’s invasion of Ukraine ignited an energy crisis across Europe, the continent has transformed how it generates and stores power. Russian natural gas, long Europe’s energy lifeline, has been replaced with other sources, notably liquefied natural gas from the United States. Wind and solar power generation has leaped around 50 percent since 2021. New nuclear power plants are being planned across the continent.

But Europe’s energy security remains fragile.

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