“Free energy” is a term used to describe an unlimited energy source that could replace the use of established (fossil-fuel and renewable) energies. The idea is that “free energy systems” would generate excess energy. However, systems with excess energy contradict the law of conservation of energy, which states that the total energy of an isolated system cannot change over time. This means that energy may take on various forms, but can neither be created nor destroyed.
Saskia Blank of the Ideas 2020 team answered this question.