Zero states 50+ Hp (which is good to go for any mere mortals like us) and 70 fl-lbs of torque , OMG!
It clearly has enough beans to clear triples.
But it weighs too much, costs too much (re purchase), and only has 9" of travel. Not a real MX bike yet -- despite the model being named "MX".
I could be wrong...but according to the "special" showing Jay Leno's Zero, the you tube infomercial from Australia comparing it to 125's, and my own checking it out for possible "someday" purchase...it is lighter than a 125. It is about $10k (all prices here are US) but also had Bush's $4k tax break - that because (like all Bush plans) was not thought out well and allowed all the dealers to cash in on all the bikes delivered and then sell the Zero at less than $6k.
Here is the problem (currently) though...Although a new battery would last a moto, it takes 6 hours to charge to you'd need minimum 2 batteries (which does not include practice or other qualifying sessions). Each additional battery is/was when I checked $2.5k...and like all these battery powered toys, the batteries lose efficiency over time so you'll be replacing them often.
Having gone down the competitive remote control car road, I can compare what it takes to run these things. I was in a competitive group, but by no means national caliber. We would use 1 new motor for every main event. It would then be relegated to a qualifying motor. We would then use it for 3 events qualifying and relegate it to a practice motor. If I remember right, a motor was about $50. Batteries were pretty much on the same schedule except that they were only used for a single qualifying event. we assembled our own batteries from cells but I think you could buy completed for $50.
Without advancement in battery technology or a drastic fall in prices, and correlating it to my RC car experience - my estimate for a season was $6 for the bike and an additional $15k for the batteries. And that is conservative hoping the motors are repairable/replaceable under warranty. Think about your equivalent fuel costs and see if it compares.