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Each $4 block of green power is about 12 percent of a typical household's monthly energy use (150 kilowatt-hours). 

Green power cost more because the technology used to capture these renewable resources is more expensive than traditional power generation methods. 

Wind Power
Wind turbines can generate electric power anywhere the wind blows steady and strong. Large blades are attached to the shaft of an efficient electric generator.  Eighteen turbines have been added to TVA's wind power generating site on Buffalo Mountain near Oak Ridge, TN.

Solar Power
The sun is an incredibly powerful source of energy. Photovoltaic panels harness that power and transform solar energy into usable electricity. When sun rays hit a solar panel, some of the electrons inside become charged and create an electrical current.

Methane Gas
There's treasure in your trash. Using methane gas as fuel to power an electric generator actually helps reduce air pollution. Unlike when it's released directly into the atmosphere as a potent greenhouse gas. Energy recovered from methane eliminates the consumption of more than 20,000 tons of coal per year.

Although no source of energy is impact-free, renewable resources create less waste and pollution.  In fact, a green power investment of $8 per month on your electric bill is equivalent to not driving your car for four months.