Where does the US buy electricity from?

Can you tell me where the United States primarily sources its electricity from? I'm curious about the diversity of energy sources they rely on, whether it's mainly from fossil fuels like coal and natural gas, or if they're increasingly turning to renewable sources like solar, wind, and hydroelectric power. Additionally, are there any notable trends or shifts in their energy mix that you're aware of? It would be great if you could provide a concise yet comprehensive overview of the country's electricity generation landscape.