[Jensson]

Much fewer electrons have to move for a detectable chemical reaction than a detectable electric current. Solid state systems are just much less efficient at computations, but they are much easier to organize.

Compare a copy operation on a DNA sequence in a cell with a copy in a memory, the cell does it extremely cheaply since it is a simple chemical reaction while the memory has to flow electrons in a giant network of nodes. You can easily copy exabytes of data using chemistry (DNA) with almost no energy.