41 External Energy Subsidies for Selected Alternative Power Plants.......................................... 136 42 Summary - Comparison of Energy Subsidies for Electric Systems...................................... 137 43 Energy "Payback" Periods After Operating Energy Subsidies for Alternative Generation Systems (Per 1,000 BTU Output).................................... 140 44 Energy Budgets for SSPS.............................. 142 45 Capital Energies for SSPS by Major Component......... 145 46 Operating Energies for SSPS by Major Component. . . . 147 47 Energy Cost of Goods and Services (Btu/$ Final Output................................................ 150 48 SSPS Materials Required Versus Potential Demand and Available Resources .................................. 152 49 Environmental Impact Areas........................... 156 50 Distribution of Microwave Power Density from the Beam Center.......................................... 163 51 Microwave Radiation Exposure Limits and SPS Beam Values at Various Locations ......................... 164 52 Worker Radiation Dose................................ 167 53 Solar Photovoltaic Array Cost Projection.............. I80 54 Operating Costs...................................... 195 55 Capital Costs........................................ 195 56 Environmental Impact Areas............................ 202 57 Microwave Power Density Limitations (Typical Ground Power Density Pattern............................... 206 58 Program Cost Estimates................................ 218 59 Comparison of O'Neill Concept with Alternative Power Systems.............................................. 223
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