Zeppelins floating above the clouds with its exterior covered with solar voltaic cells collecting electricity. This energy could be translated into microwaves to be picked up by giant antennas that convert it back into electricity to feed the Grid.
These flying electrical stations could also be tethered to the receiving stations by wire. The cable connections could have break away features should the weather change suddenly. The beauty of these aerial machines are under appreciated because of the Hindenburg disaster. That could all change with a little PR work with advertizing.
The sunshade idea was mine originally. It is back in the news. The cost is prohibitive though. Just pack the thing into the space shuttle then let another rocket take it to its forever home. The deployment would be spectacular. After a final orientation, it could be adjusted so it blocks sunlight falling on certain cities. It would pay for itself through taxes on cities it shades.
Another concept is a space based folding mirror that can light up a city creating a 24 hour day thus icreasing productivity and safety for the general public. This too, could be funded through taxes on cities where sunlight is needed at night.
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