The United States generates the majority of its electricity from natural gas, which stands as the single largest fuel source powering the nation's electrical grid, accounting for roughly forty percent of total generation. Coal follows as another significant contributor, though its share has steadily declined over recent years. Nuclear energy provides a massive, reliable baseload of about twenty percent, while renewable energy sources—including wind, utility-scale solar, hydroelectric power, and biomass—make up an increasingly large and rapidly expanding share of the overall generation mix.