Yes, According to law of conservation of energy the total energy of any system remains conserved (same).
Example.
If a body is placed at some height it possesses some potential energy.
As P.E =mgh
When this body is starting moving downwards its height becomes decreases so P.E decreases but at the same time it is moving I.e having some velocity. K.E =1/2(m)(v^2).
Hence here P.E decreases but K.E increases at the same time. So total energy is conserved.
