If you want renewable energy for your home and solar isn't practical, you might consider wind.
I take part in Xcel's Windsource Energy Program, which enables customers to pay a little extra every month towards renewable resources. That money is used to purchase wind energy for Xcel's overall grid. As the program grows, more wind energy is added. Thanks to Windsource customers, Xcel's renewable energy production is above government requirements and continues to grow.
Windsource offers several subscription options. For instance, the 100 kWh plan is equivalent to powering your lights for a month. I pay $11 per month and Xcel invests in wind energy that generates enough power to cover the needs of my entire home. Apply for the program here.