The Law of conservation of energy in Hinduism

The ‘Shivpurana’ is a set of texts devoted to the history and description of Shiva - a Hindu God. One of the lines says-
“He is Shakthi(meaning energy or power)…. He was never created, he is never destroyed. He exists, and is seen in many forms by us.”
In this quote, if one substitutes ‘energy’ instead of ‘he’, it suggests the Law of conservation of energy. It is said in the beginning that ‘he is shakthi’ there could clearly be no other meaning implied. This is amazing, to know that such a law that was discovered in a comparatively later age (latter half of second millennium) was known even in the ancient ages in India.
source:-http://www.answers.com/topic/scientific-parallels-in-hindu-mythology