Silk Soy Milk is running a promotion where, for every carton of their product with a green cap that you buy, they'll donate 30 kilowatt-hours of energy from wind power to the national energy grid. That's enough power to fuel a home for a day, coming from a clean, renewable resource. Furthermore, when you enter a UPC code from a green cap on the Silk Green Caps website, you get the chance to win some amazing prizes in the Green Caps for Green Energy Sweepstakes. The grand prize winner will receive a $20,000 gift card to a major home improvement store, which can be used to make his or her home more environmentally friendly. Ten first prize winners will each receive $500 gift cards to home improvement stores. Additionally, there are more than 400 instant prizes to be awarded, like $50 gift cards to spas or Home Depot.

To enter, you must be a U.S. resident aged 21 or above. Enter daily until the sweepstakes ends on July 31, 2008.

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