Wouldn't it be cheaper and perhaps more sensible to take say a Dash-7 and create a hybrid job out of it with electric engines for number 1 and 4.
But if you did go fully electric, could you redefine fast charging by flying near a Cb looking for a lightning strike. Don't laugh, current fast charging for cars is looking at pumping 600kW into their batteries in just a few minutes which is quite a bomb of energy.
Ho-hum, yet another glossy CGI rendering of the future, yawn.
To paraphrase Yogi Berra, "The future ain't what it used to be."