<P> The following provides yearly summaries of electrical energy generation by fuel source . </P> <Table> Yearly Electric Energy (B kWh (or Twh) per year) by Fuel Source: . <Tr> <Th> Year </Th> <Th_colspan="4"> Fossil Fuel </Th> <Th> Nuclear </Th> <Th_colspan="7"> Renewable </Th> <Th> Misc </Th> <Th> Total </Th> </Tr> <Tr> <Th> Coal </Th> <Th> Oil </Th> <Th> Gas </Th> <Th> sub total </Th> <Th> Hydro </Th> <Th> Geo Thermal </Th> <Th> Solar </Th> <Th> Wind </Th> <Th> Wood </Th> <Th> Bio other </Th> <Th> sub total </Th> </Tr> <Tr> <Td> 2016 </Td> <Td> 1,240.11 </Td> <Td> 23.90 </Td> <Td> 1,393.30 </Td> <Td> 2,657.31 </Td> <Td> 805.33 </Td> <Td> 265.83 </Td> <Td> 17.42 </Td> <Td> 36.75 </Td> <Td> 226.87 </Td> <Td> 40.50 </Td> <Td> 22.07 </Td> <Td> 609.44 </Td> <Td> 7.00 + </Td> <Td> 4,079.08 + </Td> </Tr> <Tr> <Td> Proportion 2016 </Td> <Td> 30.40% </Td> <Td> 0.58% </Td> <Td> 34.16% </Td> <Td> 65.14% </Td> <Td> 19.74% </Td> <Td> 6.52% </Td> <Td> 0.43% </Td> <Td> 0.90% </Td> <Td> 5.56% </Td> <Td> 00.99% </Td> <Td> 0.54% </Td> <Td> 14.94% </Td> <Td> 0.17% </Td> <Td> 100.0% </Td> </Tr> <Tr> <Td> 2015 </Td> <Td> 1,352.40 </Td> <Td> 28.25 </Td> <Td> 1,346.60 </Td> <Td> 2,727.25 </Td> <Td> 797.18 </Td> <Td> 249.08 </Td> <Td> 15.92 </Td> <Td> 24.89 </Td> <Td> 190.72 </Td> <Td> 41.93 </Td> <Td> 21.70 </Td> <Td> 544.24 </Td> <Td> 75.61 </Td> <Td> 4,144.27 </Td> </Tr> <Tr> <Td> Proportion 2015 </Td> <Td> 32.63% </Td> <Td> 0.68% </Td> <Td> 32.49% </Td> <Td> 65.81% </Td> <Td> 19.24% </Td> <Td> 6.01% </Td> <Td> 0.38% </Td> <Td> 0.60% </Td> <Td> 4.6% </Td> <Td> 01.01% </Td> <Td> 0.52% </Td> <Td> 13.13% </Td> <Td> 1.82% </Td> <Td> 100.0% </Td> </Tr> <Tr> <Td> 2014 </Td> <Td> 1,581.71 </Td> <Td> 30.23 </Td> <Td> 1,138.63 </Td> <Td> 2,750.57 </Td> <Td> 797.17 </Td> <Td> 259.37 </Td> <Td> 15.88 </Td> <Td> 17.69 </Td> <Td> 181.655 </Td> <Td> 42.34 </Td> <Td> 21.65 </Td> <Td> 538.58 </Td> <Td> 60.50 </Td> <Td> 4,146.2 </Td> </Tr> <Tr> <Td> 2013 </Td> <Td> 1,581.12 </Td> <Td> 27.16 </Td> <Td> 1,137.69 </Td> <Td> 2,745.97 </Td> <Td> 789.02 </Td> <Td> 268.57 </Td> <Td> 15.78 </Td> <Td> 9.04 </Td> <Td> 167.84 </Td> <Td> 40 </Td> <Td> 20.83 </Td> <Td> 522.07 </Td> <Td> 55.64 </Td> <Td> 4,112.7 </Td> </Tr> <Tr> <Td> 2012 </Td> <Td> 1,514.04 </Td> <Td> 23.19 </Td> <Td> 1,237.79 </Td> <Td> 2,775.02 </Td> <Td> 769.33 </Td> <Td> 276.24 </Td> <Td> 15.56 </Td> <Td> 4.33 </Td> <Td> 140.82 </Td> <Td> 37.8 </Td> <Td> 19.82 </Td> <Td> 494.57 </Td> <Td> 56.1 </Td> <Td> 4095 </Td> </Tr> <Tr> <Td> 2011 </Td> <Td> 1,733.4 </Td> <Td> 30.2 </Td> <Td> 1,025.3 </Td> <Td> 2,788.9 </Td> <Td> 790.2 </Td> <Td> 319.4 </Td> <Td> 15.3 </Td> <Td> 1.82 </Td> <Td> 120.2 </Td> <Td> 37.4 </Td> <Td> 19.2 </Td> <Td> 513.32 </Td> <Td> 46 </Td> <Td> 4138.4 </Td> </Tr> <Tr> <Td> </Td> <Td> 1,847.3 </Td> <Td> 37.1 </Td> <Td> 999.0 </Td> <Td> 2,883.4 </Td> <Td> 807.0 </Td> <Td> 260.2 </Td> <Td> 15.2 </Td> <Td> 1.21 </Td> <Td> 94.7 </Td> <Td> 37.2 </Td> <Td> 18.9 </Td> <Td> 427.4 </Td> <Td> 33.3 </Td> <Td> 4,151.0 </Td> </Tr> <Tr> <Td> Proportion 2010 </Td> <Td> 44.5% </Td> <Td> 0.9% </Td> <Td> 24.1% </Td> <Td> 69.5% </Td> <Td> 19.4% </Td> <Td> 6.3% </Td> <Td> 0.37% </Td> <Td> 0.029% </Td> <Td> 2.3% </Td> <Td> 0.9% </Td> <Td> 0.5% </Td> <Td> 10.3% </Td> <Td> 0.8% </Td> <Td> 100.0% </Td> </Tr> <Tr> <Td> 2009 </Td> <Td> 1,755.9 </Td> <Td> 38.9 </Td> <Td> 931.6 </Td> <Td> 2,726.5 </Td> <Td> 798.9 </Td> <Td> 273.4 </Td> <Td> 15.0 </Td> <Td> 0.89 </Td> <Td> 73.9 </Td> <Td> 36.1 </Td> <Td> 18.4 </Td> <Td> 417.7 </Td> <Td> 41.4 </Td> <Td> 3,984.4 </Td> </Tr> <Tr> <Td> 2008 </Td> <Td> 1,985.8 </Td> <Td> 46.2 </Td> <Td> 894.7 </Td> <Td> 2,926.7 </Td> <Td> 806.2 </Td> <Td> 254.8 </Td> <Td> 14.8 </Td> <Td> 0.86 </Td> <Td> 55.4 </Td> <Td> 37.3 </Td> <Td> 17.7 </Td> <Td> 380.9 </Td> <Td> 38.3 </Td> <Td> 4,152.2 </Td> </Tr> <Tr> <Td> 2007 </Td> <Td> 2,016.5 </Td> <Td> 65.7 </Td> <Td> 910.0 </Td> <Td> 2,992.2 </Td> <Td> 806.4 </Td> <Td> 247.5 </Td> <Td> 14.6 </Td> <Td> 0.61 </Td> <Td> 34.5 </Td> <Td> 39.0 </Td> <Td> 16.5 </Td> <Td> 352.7 </Td> <Td> 36.6 </Td> <Td> 4,188.0 </Td> </Tr> <Tr> <Td> 2000 </Td> <Td> 1,966 </Td> <Td> 111 </Td> <Td> 615 </Td> <Td> 2,692 </Td> <Td> 754 </Td> <Td> 260 </Td> <Td> 14 </Td> <Td> 0.49 </Td> <Td> 5.6 </Td> <Td> 37.6 </Td> <Td> 23 </Td> <Td> 318.7 </Td> <Td> 38.6 </Td> <Td> 3,836 </Td> </Tr> <Tr> <Td> Proportion 2000 </Td> <Td> 51.3% </Td> <Td> 2.9% </Td> <Td> 16.0% </Td> <Td> 70.2% </Td> <Td> 19.7% </Td> <Td> 7.2% </Td> <Td> 0.37% </Td> <Td> 0.013% </Td> <Td> 0.15% </Td> <Td> 1.0% </Td> <Td> 0.6% </Td> <Td> 9.3% </Td> <Td> 0.9% </Td> <Td> 100.0% </Td> </Tr> <Tr> <Td> 1999 </Td> <Td> 1,881 </Td> <Td> 118 </Td> <Td> 57l </Td> <Td> 2,570 </Td> <Td> 728 </Td> <Td> 319.5 </Td> <Td> 14.8 </Td> <Td> 0.50 </Td> <Td> 4.5 </Td> <Td> 37 </Td> <Td> 22.6 </Td> <Td> 392.8 </Td> <Td> 55 </Td> <Td> 3,723.8 </Td> </Tr> </Table> <Tr> <Th> Year </Th> <Th_colspan="4"> Fossil Fuel </Th> <Th> Nuclear </Th> <Th_colspan="7"> Renewable </Th> <Th> Misc </Th> <Th> Total </Th> </Tr> <Tr> <Th> Coal </Th> <Th> Oil </Th> <Th> Gas </Th> <Th> sub total </Th> <Th> Hydro </Th> <Th> Geo Thermal </Th> <Th> Solar </Th> <Th> Wind </Th> <Th> Wood </Th> <Th> Bio other </Th> <Th> sub total </Th> </Tr>

Largest to smallest contributor to the u.s. energy portfolio