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The general public has NO idea how the electric grid actually works. You may buy "green power" from a wind farm that is 200 or even 1000 miles away, but the actual power delivered to your place may be coming from hydro, coal, gas, or a nuclear plant. It just means the request is transfered from company to company to a local power company who actually delivers the power to you lines by one selling power to the next one who wheel it across the nation. Each power company just charges the other the cost to move it along their lines. Your "green power" that you bought usually will stay locally to where it was produced and load is transferred region to region to deliver you extra cost power. A simplistic explaination, but close.
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