For several years in the Italian energy market was liberalized. Since that time there have been numerous holders of households that have decided to go to the free market. Others have preferred to stay in the cd. protection service, and pay electricity consumption based on prices set every three months by the Authority.
It is precisely this difference: in the free market are the sellers decide the price of energy, in the protected market is instead the Authority to fix costs.
However, do not always have a clear idea when choosing whether to switch to the free market. For this reason, before taking any decision, you should read up pray so that an informed choice.