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energy in space, and environmental issues including high

voltage in low earth orbit, plasma issues and ionospheric

considerations.

These are all precursors in development work which can capitalize upon the Shuttle and pave the way toward the development of the Power Technology Module operations.

A further organizational consideration is to what extent, if any, international participation should be encouraged. The Power Technology Module offers an additional avenue for

cooperation in that the pressurized container for the PTM

equipment could be a Spacelab module. Internal equipment could also be provided by the European community as appropriate.

CONDITIONS FOR STARTING MAJOR SPS DEVELOPMENT IN 1985

The results of long range programs do not provide the early

gratification which shorter range projects frequently do. On the other hand, if events continue along their present path,

by 1985 we will face a strong public concern for the rapid

depletion of our oil and gas resources, a concern for the

expanding environmental pollution caused by our increasing reliance on coal and a distaste for our forced dependence on foreign sources to meet our basic energy needs. It is probable, moreover, that there will not be a revolutionary breakthrough

in the development of other "inexhaustible" electrical energy

sources.

They also will continue to show their current promise

as a year 2000+ solution.

Given these conditions, however, it would still not be

prudent to start a broad commitment in 1985 to Solar Power

Satellite development unless believable experimental answers

have been provided to the key Solar Power Satellite viability

issues by that time period. These key issues which should be

resolved are:

Demonstration of a high production rate solar power
conversion system

Development of large space structure fabrication,
assembly and control technology

Microwave power transmission demonstration

Environmental impact appraisal

These issues are addressed as shown in Figure 5 in the

integrated Ground, Shuttle Sortie Flight and Power Technology

Module program which have been outlined.

It is only by

providing this experimental data that a convinced government

could then direct that the next major step in solar power

technology be taken.

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would cost about $224M including its launch cost.

Plan and implement a series of Shuttle sortie missions

to prepare for the Power Technology Module era.

This

is estimated to be about 5 flights in the 1980 to

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the next step in our country's space program and certainly is

not intended to be totally comprehensive of all that should be

done in space.

Solar Power Satellite Technology Development

is a program which I believe will provide fresh impetus and

enthusiasm within the space community.

We will be using the

Shuttle and space technology to perform a mission of great

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