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The principle of conservation of energy says that all energy in a system will remain the same. It can just be transformed.

The universe contains a huge amount of energy, but where did it come from? I know there isn't that ONE answer, but I'm curious as to what the thoughts and theories about this question are.

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    $\begingroup$ there are many duplicates. ie Is it possible all matter in the universe emerges from nothing? . Look at Related column on the right page $\endgroup$ – user46925 Jan 24 '16 at 21:53
  • $\begingroup$ One theory is that the universe cycles between expansion and collapsing. The energy from the Big Bang could have been a bounce from a Big Crunch. $\endgroup$ – Bill Alsept Jan 25 '16 at 5:52