Consider the electricity generation system in the USA as shown in the Sankey diagram of Figure 12.7. Assuming that 70 percent of the total feedstock entering this system is converted into electricity, calculate the energy return on investment of the system.

Figure 12.7: 

Transcribed Image Text:

Solar 0.775 Nuclear 8.42 Hydro 2.77 Wind 2.35 Geothermal 0.211 Natural Gas 28.0 Coal 14.0 Biomass 4.91 Petroleum 36.2 8.42 2.75 2.35 9.54 12.7 0.52 0.21 0.04 0.15 0.48 Estimated U.S. Energy Consumption in 2017: 97.7 Quads Net Electricity 0.06 Imports Electricity 12.5 Generation 37.2 9.84 0.19 3.29 0.76 4.58 0.02 0.01 0.08 /0.02 1.24 1.43 2.48 0.33 0.16 0.02 0.83 8.38 0.88 4.7 4.6 3.231 0.03 25.9 24.7 Residential 10.7 Commercial 8.99 Industrial 25.2 Transportation 28.1 3.75 6.97 3.15 5.84 12.9 12.4 22.2 5.91 Lawrence Livermore National Laboratory Rejected Energy 66.7 Energy Services 31.1