Earlier quoted context omitted.
Perhaps, but several orders of magnitude less bad than health and ecological problems from sunlight.
How can you get more power from an orders of magnitude less powerful beam than from an orders of magnitude more powerful beam (sunlight) over an equal surface area? And if you can’t, why do it? This blows my mind.
Firstly, you have 24/365 production, always at peak power. All things equal, you need a lot less capacity for equivalent power generation.
Then, I am fairly certain that the amount of power that can be collected depends a lot on antenna size, just like standard wireless transmission: the antenna needs to be "tuned". And a few hundred meters of steel cable would likely absorb a lot more energy than an 80 L water bag.
And finally (but related), microwaves are likely a lot less dangerous than UV: it isn't ionizing, because individual photons cary a lot less energy. That also means that they penetrate more "cooking" (increasing temperature) more deeply the objects in its path. Instead of getting your skin burnt from the energy, you feel slightly warmed up (and would likely be able to dissipate the small extra heat in the atmosphere). A sizeable portion of this energy would likely end up in the ground, if no antenna is present to collect it.
This technology is interesting, as it offers a lot of new possibilities: it's easy to relocate, for instance. We might also be able to split the beam to power multiple places simultaneously, reducing grid losses (and load balancing at the satellite).