A: 'GUST' is an acronym that stands for a series of four recent tax laws that also made changes to how retirement plans are operated. âEGTRRAâ is the acronym for the tax law enacted in 2001.
Of the renewable energy sources used to generate electricity in the United States, hydropower makes the biggest contribution. Water used to spin a turbine is a cheap, non-polluting domestic source of energy. But hydropower brings with it other environmental impacts to consider. More about hydroelectric.
In 2014, the United States generated about 4,093 billion kilowatthours of electricity. 1 About 67% of the electricity generated was from fossil fuels (coal, natural gas, and petroleum). Major energy sources and percent share of total U.S. electricity generation in 2014: 1  Coal = 39%.2  Natural gas = 27%.3  Nuclear = 19%.4  Hydropower = 6%. 5  Other renewables = 7%. 6  Biomass = 1.7%. 7  Geothermal = 0.4%. 8  Solar = 0.4%. About 67% of the electricity generated was from fossil fuels (coal, natural gas, and petroleum). Major energy sources and percent share of total U.S. electricity generation in 2014: 1  Coal = 39%. 2  Natural gas = 27%. 3  Nuclear = 19%. 4  Hydropower = 6%. 5  Other renewables = 7%. 6  Biomass = 1.7%. 7  Geothermal = 0.4%. 8  Solar = 0.4%.