My 3 preferd sources of energy are:

Hydropower
Nuclear Power
Wind Power

I'll start with the advantages of Hydropwer.
Hydroper is a renewable recource which means it can be re-used. It already suplies 19% of the worlds electricity. Another good thing about Hydropwer Dams are that they can also supply drinking water, which is a great. Hydropower is cost-effective, after the initial cost of building the dam is overcome. Hydroper causes no polution therefore it is good for the enviroment, it is both good and bad for the enviroment.

Nuclear Energy
Despite that Nuclear Energy is Non-Renwable recource it causes little poultion compared to the burning of coal. Nuclear Energy can be a safe source of energy depending of how you use it. It's effect on the enviroment has been quite large on some occasions.

Wind Energy
Wind energy is a renewable recource. It causes no polution and is one of the cheapest forms of energy. The turbines in past have killed many birds.The turbines are known to break down and break easilly but other than that they are very eay to work with.