Free Electricity : Possible? May be "yes" - The Power of Pure Water.
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The basic idea of this activity is to use this alternate source to brighten homes of poor at least during day time.
How it will work:
Take a water bottle, with water along with some bleach. Now the holes are cut over the ceiling and the bottle is placed so that its lower half emerges from that hole of the ceiling. Now when Sunlight falls - the clear water disperses the light in all directions through refraction, which can provide a luminosity that is equal to 55 watt electric bulb with an efficiency of 5 years.