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Ok, looking at the data, Germany gets over 40% of its electricity from renewables, while the USA gets less than 20%.

The US has multiple states larger than Germany I think. Regardless, it is much bigger and requires more work.

Germany has a population of 80 million people. The largest US state is California with 40 million people.

Population and load is only one piece to the puzzle. A larger country means a much larger and more expensive transmission grid.