The Swedes were seen by Jasmiin Ypraus who dominated the premiere competition.
The Estonian got off to a dream start with three straight heat victories.
In the final heat, Örtendahl chased Ypraus when the accident occurred.
- I got a battery problem and the machine stopped at full throttle.
I fell and ended up on the wrong side of a boundary buoy and thus I was washed, says Emma-Nellie who reached a third place as the best and is sixth in the summary.
Jonna Borgström started weak but showed with second place in the final heat that the top results are there.
The 24-year-old from Bohuslän is fourth in the table, 23 points behind Ypraus.
This weekend's Swede was Samuel Johansson who is third in the sitting class - Runabout GP1.
Samuel took second place in the first heat and is ten points behind leader Marcus Jörgensen, Hungary.