Beg to differ.
In land area, Germany is slightly smaller than Montana. 137,847 square miles compared to 147,046 square miles. Population Germany = 81.1 million. US population = 311 million.
Land area entire EU = 1,707,787 sq miles. US = 3,618,780 sq miles.
Many of the prime areas for wind and solar power generation in the US are farther away from the population centers than any situation Germany or the entire EU would ever encounter.
The level of difficulty with renewable power grid logistics encountered in Germany or the entire EU has little to compare with the US.