That is my take, this is potentially the ultimate technology barring something that manipulates physical law, though I wouldn't say biology but advanced synthetic biology to be more precise.
People tend to underestimate the power of what can actually be created when you transcend evolutionary limitations with cells.
Biology uses cells as main workhorses in many cases, but synthetic biology can allow cells to construct precise nano-structures organic and inorganic of arbitrary function. Structures that can be scaled to macroscopic dimensions if need be. Cells are able to drastically alter metabolic rate in nature, reducing it as needed, basically halting metabolism and allowing them to consume practically no energy for decades or little energy for even longer.
People tend to think in terms of just animals or plants in terms of the limits of synthetic biology in fiction. But potentially anything could be built by synthetic biology, a TV, a car, a computer, a plane.
Not only are cells able to produce electricity, but they are also able to consume electricity, not just light or chemical fuels. There have been closed systems with biological organisms only in-taking external energy able to recycle all components and continue functioning for decades or more. Self contained devices using cells can be made to recycle all wastes and not need exchange of atoms with the environment only the exchange of energy. Though such restriction can be lifted if it is more convenient as needed.
The thing is cells replicate, and could potentially be used to mass produce. Right now the efficiency of conversion from solar to chemical is quite low, and most plants have low resilience to hostile conditions, they are also not designed to be coupled with a computer for the production of arbitrary products. But cells could be coupled with the energy produced from fission or in the future from fusion, allowing unlimited replicative ability, the excess energy could be used to purify or scavenge any resources that were needed.
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