@clive

From the article: "computational workload, which required 0.3 microwatts of power, and 15 minutes of standby, which required 0.24 microwatts."
That's the amount of power you can get from a literal hamster wheel after the hamster is dead and it only moves when the wind blows or even the cheapest fotovoltaic cell placed in shade. I mean, c'mon.