I think you have it backwards. The price of the asset being mined determines the costs of the energy put in to mine it.
By equitable distribution, I mean that mining is on average only marginally profitable; the bulk of mined coin needs to be sold on the open market, which means there is always liquidity and availability to those seeking to enter or exit.
Hashing power centralization and coin distribution are different topics. Decentralization of hashing power will continue to increase as the renewable energy costs continue to lower, because they will eventually match and then lower beneath the subsidized rates currently available only in specific jurisdictions. Costs will shift to initial capital investment rather than energy supply.