I definitely applaud your desire to go green. These things have been on my mind over the last few years as well. Mostly for cost savings but including to reduce my footprint in the world. I know it is tempting to implement a system that allows for renewable power, but the reality is that the return on investment (ROI) of these are not as high as energy conservation measures. Dollar for Dollar the money you put in to make your home more efficient will earn your money back faster than most renewable systems. I'm not saying that you should not look to setup a renewable system in the future, but get the heavy hitters that are wasting energy now. Personally I seriously want to go solar one of these days and I live in Ohio.
The big one I would look at in terms of energy savings is your home air sealing and insulation. If you have drafts or areas that allow heat to escape easily then those are huge energy suckers and negate any renewable system even if you did put one in. The following is a good site that discusses the topics:
http://energy.gov/energysaver/articles/air-sealing-your-home
http://energy.gov/energysaver/articles/insulation
Also this one discusses the ROI of the various energy saving measures and shows the time and payback in an easy to read table:
http://www.greenandsave.com/master_roi_table.html
All this being said, depending on your financial standing I would first look at programs for energy assistance as well to see if the criteria is met:
http://www.oregon.gov/OHCS/Pages/SOS_Low_I...nce_Oregon.aspx
http://www.oregonheat.org/energy-assistance
I hope this helps...