Okay, that is pretty awesome. Some thoughts... greens are probably optimal for this because they are fast to go from seed to produce. And 100% of the output can be sold, with basically no wastes. Singapore is also optimal for greenhouses. The temperature there is 23C-32C year round, so you don't need HVAC (just air filters on your vent fans) and you can grow continuously.
The waterwheel thing is clever not for the energy efficiency (it'll be the same regardless) but because it greatly reduces the amount of mechanics/electronics that are exposed to the greenhouse humidity, greatly improving reliability. (Installation cost is probably the same as if you had a gearmotor on every tower, just because the funny waterwheel is probably not an OTS part.)
But even in the video they call it a "premium novelty for consumers", which basically means not yet economical. And who knows how much of it was backed by the mentioned incentives. (They show some prices at 5:12 and 5:41, maybe that can give an idea.)
The waterwheel thing is clever not for the energy efficiency (it'll be the same regardless) but because it greatly reduces the amount of mechanics/electronics that are exposed to the greenhouse humidity, greatly improving reliability. (Installation cost is probably the same as if you had a gearmotor on every tower, just because the funny waterwheel is probably not an OTS part.)
But even in the video they call it a "premium novelty for consumers", which basically means not yet economical. And who knows how much of it was backed by the mentioned incentives. (They show some prices at 5:12 and 5:41, maybe that can give an idea.)