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In a CE transistor amplifier there is a ...

In a CE transistor amplifier there is a current and voltage gain associated with the circuit. In other words there is a power gain. Considering power a measure of energy, does the circuit violate conservation of energy?

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No, law of conservation of energy is not violated because here increase in the energy of input AC signal is at the cost of energy stored in DC supply. (That is why after using the amplifier for some time, we have to replace that battery if it is not feedback amplifier). Thus, here energy of output signal = energy of input AC signal + energy of DC supply.
Hence, law of conservation of energy is not violated.
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