3. Hydrothermal Energy
I find hydrothermal energy to be number 3 in being used in Italy for one big reason. Geothermal is already being used in Italy, and since that and hydrothermal are almost exactly identical, it made it absolutely redundant to have both geothermal and hydrothermal when they both do almost exactly the same things. An example of that is they are both hard to move, both are very green in terms of the environment, and both get the energy from almost the same source.
2. Wind Energy
I find that wind energy would be put as number 2 in being used in Italy as a good source in coastline and northern environments. Wind power is being used in Italy in some parts, growing over the past few years. The reason I believe that wind energy is better in the coastal regions is the fact of wind being more prominent in those regions, which also explains lower temperatures. The same thing can be applied to Northern Italy as well. A minor difficulty with wind power might finding room to build the expensive turbines, since Italy isn't that big of a country.
1. Solar Energy
I find that solar energy would the top option for Italy to implant because of the location of where the country is located. Italy is located in an region where precipitation is moderate not over the top, and sunlight can reach over 11 hours a day in the summer months. All of these help out the usability of solar panels, which unlike the other two, is less expensive. Like wind power, solar power in Italy has grown in the past few years, upwards of around 300%. The only issue with solar power is its lack of effectiveness in the winter months, due to lower amounts of sunlight in the day and higher counts of precipitation.