system elements includes currently planned propulsion stages and advanced concepts optimized for an operational SSPS system. Minimum-cost transportation combinations will have to be identified which can fulfill the requirements for SSPS delivery, assembly, and maintenance for an operational system. The challenge of an SSPS capable of generating 5,000 MW of power on Earth is to place into orbit a payload of about 25 million pounds and propellant supplies for station-keeping purposes of about 30,000 pounds per year. FIGURE 6. ~ POTENTIAL SSPS POWER LEVELS
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