If we assume that the electricity comes from solar panels, then it truly is comparable to plants. The difference is that here, energy collection (panels) and protein production (microbes) are decoupled from each other. Both of these function more efficiently than the corresponding functions in plants (panels collect light more efficiently than plants, and microbes grow faster than plants). Additionally, both the panels and the production facilities can be located more freely than crop cultivation; for example, drought or temperature are not as critical as they are in farming. This saves on arable land, which can then be used, for instance (in an optimal scenario), to increase biodiversity.
That being said, I am very skeptical about whether there will be sufficient demand for that product and whether production costs can be lowered enough. I just wanted to explain that potential benefit.