They will be coming. Of course, they will put an increased load on our power grid, which is already unstable.

Which brings me to the subject of DC Transmission. (Transmission is sending large amounts of power from one place to another. Distribuition is splitting large amounts into smaller amounts to send to the customers. Don't confuse the two.)

DC grids, unlike AC grids are inherently stable. AC grids must be sychronized. If there is a large change in load, the inertia of the generators tends to move them out of synch faster than they can adjust. When they are a few degress out of phase, circuit breakers fire to isolate them. This causes a further change of load, and so the entire process can result in taking the entire grid offline.

DC grids do not require synchronization. The problem is that DC can not change voltage via transformers, while AC can. Also, since all distribution systems are AC, the DC must be converted to AC at the distribution end. This requires appropriate equipment and involves losses. But AC transmission involves losses as well due to inductance and capacitance, while DC suffers no such losses.

Furthermore, DC grids are easily hooked in parallel to large battery arrays. These can provide load-levelling and protect from transients. I foresee large DC grids with battery arrays in the next generation of power transmission.