"All energy sites are under heightened security, especially the energy bridge," Sheremet said on Wednesday.
According to the first deputy prime minister, Crimea does not expect to receive power from Ukraine as the situation there is unstable and there can be no guarantees of electricity supplies.
"We do not expect that supplies will come from Ukraine, we are relying only on our own strength, on mainland Russia that has been supporting us all this time. I am sure that we absolutely do not need Ukraine’s power system," Sheremet said.
According to the Russian authorities, the first leg of the "energy bridge" to Crimea will significantly decrease electricity deficit in the republic, while the construction of the second leg by May 2016 is expected to completely eliminate Crimea's dependency on electricity from Ukraine.
Kiev claims that "activists" have been obstructing repair works of the damaged electricity lines. Ukraine’s radical Right Sector organization pledged on Monday to continue its energy blockade of Crimea.