Waste product is water. Hydrogen can be produced from any hydrocarbon or from solar energy. Fuel cells remove electrons from hydrogen to make electric current. Windmill is 10 stories tall with 80 foot blades. Wind driven blade movement generates electricity.
Wind power is cheap and effective in rural areas such as the great plains.
Usually needs a dam and reservoir to store enough water for constant power generation. But dams can damage the environment. Turbine wheel generates electricity. Have to be built at a location with constant wave action. Have to be protected from storms.