Your Questions About Solar Energy Generators

Sharon asks…
What is the most used alternative energy source?
im doing a project on alternative energy sources and i need to know if solar energy is the most used

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David asks…
how can i convert hot water into energy?
live in a tropical. thinking about installing a method to convert solar energy into electricity indirectly, via solar water heater ==> energy.
any idea??
ps: the hot water here is only up to 90degree centigrade but almost constant.
90 degree is not enough for turbine generator right?
i tried not to add any heat on it.

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