-Objective: Is NPG a nice idea to use as alternative energy?
it should be your thesis, and you should clearly say YES or NO.
Answer: Is NPG a good idea? -> Discuss about NPG (in conclusion)
no, the purpose of your intro is your thesis sentence that clearly explain the rest of your essay, and you can't wait till the end to say yes or no. It would be a very immature writing or narrative. Since you are doing neither, put your answer in the beginning.
Thesis
support
support
support
...
Repeat thesis in a different way.
If your body paragraphs follow that pattern, then it's right. Remember, always support and come back to your main thesis in the intro.
Oh, and a research paper is different from all others because you need to QUOTE!!! so find articles and CITE a bunch of stuff and you'll be good to go. Don't forget the bibliography and MLA format.