From what I've seen, the electric cost is actually only a small component, the building, specialized hardware, maintenance and labour make up the majority of the bill for most vertical farming operations.

Further, it's a matter of how much energy density you need within a given volume compared to the available roof surface. Most plants don't need full sun, but you might only be able to supply 2-4 times the roof area as internal grow area (when accounting for efficiency losses and the needs of the plants). You would need to provide the majority of the grow area with LED lights anyway. So it might not be worth the resources/labour costs. Though it might be a good supplemental supply of photons.

~~The only real use case I can see for vertical farming is providing fresh produce nearer to urban centres, or if there is an acute shortage of land, otherwise passive greenhouses (with supplemental lighting and heating if needed) are generally a better use of resources. Specialized produce is another use case, but it seems that we need a lot more research to make it a viable option at scale.~~

A question of where the energy comes from is also important, solar panels in a desert/on roof tops is good, but if they replace a farm field it's pointless. Wind, nuclear, hydro are good options.

I'm definitely curious to see how the field grows within the context of China and socialism more broadly. Many of the constraints in current implementations are only important when the only consideration is profit.

Edit: read the article, they have some really interesting use cases in their facility beyond what I could imagine.