The FIA has banned the use of twin motors in the ABB FIA Formula E championship starting from the 2019/20 season.
Manufacturers have had freedom of choice over how many motors they use since powertrain development was opened up for the series' second season in 2015/16.
Twin motors have been used by FE manufacturers in the past – notably by NIO, as NEXTEV, and DS – without much success and the field largely converged on a single-motor approach for the start of the Gen2 era.
The move is expected to impact on the Nissan e.dams squad, which is widely understood to be the only FE team that is running a twin motor set-up in the current 2018/19 championship, although Nissan has never publicly disclosed the make-up of its powertrain.
The team is yet to win a race in the 2018/19 FE season, but has scored five pole positions – the most of any squad – and these qualifying performances have attracted particular attention from rival squads.
When asked to explain his team’s prowess in qualifying after the most recent race in Berlin, Nissan driver Sebastian Buemi said his squad had “made some choices and some of them pay off and some don’t.
“Clearly our car is quick in quali where we don’t have to save energy and is not efficient in the race,” he continued to Motorsport.com. “Simple as that. That’s the trend and it’s like that.
“You go away, you get the positive of something and you’re happy and you get the negative and that’s it.
“[To rivals] just don’t try to lobby or cry when you are behind to say ‘it’s not fair’ and then when you’re in front it’s all good. I just want to have things fair at the end.”
An FIA statement announcing the WMSC decision read: “A modification to the technical regulations was also approved, reducing the maximum number of MGUs (rotating electromechanical power converters) from two to one.”
Motorsport.com has approached Nissan for comment regarding the decision.
Formula E unveils 2019/20 calendar with earlier start date
FIA working on solution to FE/WEC calendar clashes