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Cognitive Radio Networks is considered as the solution to the problem of limited bandwidth which arises in the wireless networks. Spectrum sensing is an important issue of CRNs. Spectrum sensing involves the sensing of the licensed user signal, then allowing the unlicensed user to use the free spectrum band in the network. The energy based spectrum sensing techniques in CRNs become important in battery oriented applications. This paper focuses on some existing researches on energy based spectrum sensing. Many factors which play an important role in the sensing process have also been explained.