The Law of Conservation of Energy is undoubtedly correct when it shows that more energy cannot be taken out of any system than is put into that system. However, that does not mean that we cannot get more energy out of a system than we put into it. A crude example is a solar panel in sunlight. We get electrical power out of the panel but we do not put the sunlight into the panel - the sunlight arrives on its own. This example is simple as we can see the sunlight reaching the solar panel.

If, instead of the solar panel, we had a device which absorbs some of the energy which Quantum Mechanics observes and gives out, say, electrical power, would that be so different? Most people say "yes! - it is impossible!" but this reaction is based on the fact that we cannot see this sea of energy. Should we say that a TV set cannot possibly work because we cannot see a television transmission signal?