I'm curious about Handmeier's opinion on location of data centers.

Should they be close to the solar arrays (that is, in the desert, with data networks connecting them to were the tokens are used)

Or close to their customers (which mean far from the solar arrays, with electricity networks)

He's talking a lot about removing movable parts, but aren't the wires going to be an limiting factor ?

Fiber is much much less of a cost and technical challenge compared to transfering GWs of power. Unless the customer cannot handle up to 100ms latency, it's totally logical to place the data centers close to the power source, or vice versa (power source close to the data center).