The VTOL propellers are natural power generation for onboard power. The produced energy is through tether and yoyo like always, there is no plan for changing any of this (at Kitemill).
Though there are several voices of concern about this strategy, and I can sympathize with them to some extent, yoyo is still a viable and maybe a very strong contender in the architecture battle in AWE.
We must also remember what the current state of the art is: as much as I would like to have made a rig with many kites, flying a single wing seems like a logical step in order to progress. And once we get there, perhaps we’ll find that a single wing is enough?
Please also note that I put “Kitemill” in my profile as a disclaimer. I am not representing Kitemill on this forum, rather myself. To avoid mixing the two I need to be very careful commenting on issues closely related to Kitemill’s research and development. Any straightforward info I can give (like above), but more difficult questions I will have to route through proper channels…
This also means that if I say that such and such is a good idea, that does not necessarily mean that Kitemill as a company is of the same opinion.