When will an Electric Vehicle (EV) win its first Formula One race?

Auto racing has long been used to demonstrate automobile technology.
The IEEE Spectrum post  Auto Racing Test Drives Its Own EV Future points out that Electric Vehicles (EVs) are making great strides in auto racing, although "At the Monaco Grand Prix circuit, where Formula E recently ran the full course for the first time, an F1 [Formula One] car ... is faster by at least 10 seconds per lap..." 
How long do you think it will be until an EV wins an F1 race?