If POS technology has not yet been implemented in Energi, then there are good reasons for not doing this. So the coin must go through a certain stage of its development in order to later introduce POS
The value of one Energi masternode is too expensive.
and this one does not have PoS, so small investors and non-miners don't have chance to join the project.
I propose the Energi team to implement PoS in the future on Energi network.