It will be interesting to see how this race goes...
http://thekneeslider.com/
(http://thekneeslider.com/images/2009/04/missionone.jpg)
(http://thekneeslider.com/images/2009/04/kingston-ttxgp.jpg)
I'm guessing they have an 8-hour break each 37 mile (or whatever) lap for recharging.
It works like a relay race, you've got pit members every 100' with an extension cord in hand ...