2. The inventor of WPT is “Nikola Tesla” he
manage to light 200 lamps at a time from
40 kms at Wardenclyffe in 1890’s.
• World war 2 developed ability convert energy to
microwaves using magnetrons & 1964 William
C.Brown Demonstrated a rectna which could
convert microwaves power to electricity.
In 1968 idea of SPS proposed by “Peter
Glaser”.
• Idea gained momentum during the oil crises of
1970’s but after prices stablizied idea was dropped.

3.  A major problem facing planet Earth is provision of an adequate supply of
clean energy.It has been that we face three simultaneous challenges.
1)Environmental degradation
2)population growth
3)Resource consumption
 Hense, a major task for the new century will be to develop sustainable &
environmentally friendly source of energy.
 Solar power provides a source that is virtually carbon free & sustainable.

4. What is SPS???
Solar Power Satellites would be located in the geosynchronous orbit.
The solar energy collected by an SPS would be converted into electricity,
then into microwaves. where they would be received and converted back into
electricity by a large array of devices known as rectifying antenna or rectenna.
(Rectification is the process by which alternating electrical current ,such as that
induced by a microwave beam , is converted to direct current).
This direct current can then be converted to 50 or 60 Hz alternating current .

5. Why to use SPS ???
There is no air in space so, the satellite would
receive somewhat more intense sunlight
unaffected by weather.
The SPS concept is simpler than most power
system here on the earth
Solar radiation can be more efficiently
collected in space where it is roughly three
times stronger than on the earth & it can be
collected 24 hours per day.
Since there are no clouds or night in high
earth orbit.
SPS does not use up valuable surface area on
the earth.

6. Construction of SPS
Each SPS would have been massive;
measuring 10.5 km long and
5.3 km wide or with an average area of
56 sq.km.
The surface of each satellite would
have been covered with 400 million solar
cells.
The transmitting antenna on the
satellite would have been about 1 km in
diameter
and the receiving antenna on the Earth’s
surface would have been about 10 km in
diameter
The SPS would weight more than
50,000 tons.

7. Rectenna
5,000 MW Receiving Station (Rectenna)
•Microwaves are received with about 85% efficiency
•Around 5km across (3.1 miles)
•95% of the beam will fall on the rectenna

8. Practical Example of SPS
Japan is definitely getting in on the action with its latest spacey plan
– a $21 billion solar-powered generator in the heavens to produce one gigawatt
of energy, or enough to power 294,000 homes.

9. Advantages
Unlimited energy resource
Energy delivered anywhere in the world
Zero fuel cost
Zero Co2 emission
Solar radiation can be more efficiently collected in space
Waste heat is radiated back in to space
No air or water pollution created during the power generation
Concept is simpler than any other most power systems on the Earth.
Space gets full power 24 hours a day
No effect of storms,no cloudy season,no long winter nights

10. Disadvantages
Launch cost
Would require a network of hundreds of satellite
Interfacing with communication satellite
The size of antennas & rectenna
Complexity -long year to complete
Size -6.5 miles long by 3.3 miles wide

11. Conclusion
SPS is still more expensive than ground based solar power & other energy
sources.yet even now,a small SPS system could be economically justified to
provide unavailable emergency power for natural disaster situations.urban
blackout & satellite power failures
For WPT via SPS to become reality require



Government support
Cheaper Launch prices
Involvement of private sector