Look at some numbers from Fortune magazine on Formula One for the prospects from Formula E
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As Forbes reported last year, an economic impact report on the 2015 Canadian Grand Prix revealed that 68% of the 244,374 admissions to the track were from outside Montreal and generated a total of $90 million in spending. The report added that around 640 jobs are created or maintained by the Grand Prix, generating $8.1 million in tax revenue for various levels of government.

It goes some way to offsetting the state’s annual investment in the race which comprises $4.6 million from federal government, $3.7 million from the province of Quebec, $4.6 million from Tourism Montreal and $0.9 million from the city itself. Montreal is also contributing $23.7 million to upgrading the pit and paddock facilities which have been in place since 1988.
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Seems like if it wasn't GREEN to be attacked someone would look at the entire bottom line and see this is good for Montreal.