Does incurvation of space requires energy?

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Forgive me for any misconception I may have, but as a first year university student, I know that any force alters energy to different forms. Mass curves space and the curved space causes gravity...but any change in spacetime requires energy...So where does the energy "used" to incurvate space comes from??
 
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Energy is a tricky concept in GR:
http://www.phys.ncku.edu.tw/mirrors/physicsfaq/Relativity/GR/energy_gr.html
 
Although it was a little enlightening,I searched more and from the little I understood due to my yet limited knowledge no main theory exists to justify this energy exception in space time, it can only be approached peripherally, not directly. However thank you for your immediate answer, you gave me the direction to continue my research.
 

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