The correct answer to this open question is the following.
Unfortunately, you did not include the link to the movie, the name of the movie, or any reference to it. Without that information, we do not know what you are talking about.
However, trying to help you, we can answer in the following general terms.
The advantage and disadvantages of alternative energies are the following.
Wind energy. The main advantage is that wind is part of the earth and is a free supply. The disadvantage is that it needs strong wind to move the mills so electricity can be produced.
Hydropower. The advantage is that it can be stored in dams. The water in the dams can be used by people to ride small boats. The disadvantage is that there should be a close water supply and the cost is elevated too.
Solar Energy. The advantage is that is natural and we can have sunlight every day. It is unlimited and it does not pollute the environment. The disadvantage is that is costly and it all depends on the availability of sunlight.
