Did you attend one of our "Amazing Library Challenge" sessions this September ? We offered some tips about searching that I'll add here.
Search engines and databases can be confusing when the results you get are not very close to the information you need for your assignment. To eliminate some of the web pages that are designed to sell you stuff you don't need try this:
"wind power" -.com
Your results will NOT include any web pages that have commercial web addresses. You will get results from universities, scientists, researchers, government, non-profit organizations, and other sources that have .ca, .gov, .edu, .net, .org and a variety of other extensions at the end of their web page addresses.