The article explores how to make products using less energy by tracking energy use accurately. To do this, a method is introduced to divide total energy into calculated energy use and losses, so you know how much energy is really being used to make things. This new method helps to determine the true energy efficiency of a process, eliminating guesswork. By separating energy flows, we can better understand and improve how much energy our products really need. The method focuses on measuring energy accurately to reduce waste and make smarter energy choices.