Question: Does the law of conservation of energy apply in this case?
Answer: Absolutely. Moreover, in our world, this law almost does not work. We do not know where everything disappears, we just make assumptions that this is how it happens in nature. Actually, all energy vanishes, goes into black holes, etc.
However, in the spiritual world, nothing disappears because there is a clear connection between Malchut and Keter. Everything happens within these ten emanations. It is an absolutely enclosed system.
Answer: Do not worry, everything finds its place, address, and justification.
From the Kabbalah Lesson in Russian, 11/25/18