Hydroelectricity is both Eco friendly and renewable

Pollutant free

So in conclusion...

And affordable to pay for

http://responsiveuniverse.me/tag/money/

http://en.wikipedia.org/wiki/Pollution

http://www.parsons.com/markets/energy/Pages/HydroelectricEnergy.aspx

http://education.nationalgeographic.com/education/encyclopedia/hydroelectric-energy/?ar_a=1

http://education.nationalgeographic.com/education/encyclopedia/hydroelectric-energy/?ar_a=1