Good luck to 'em
I use to race 100cc karts, and about 10 years ago the first electric models started to appear at circuits - pretty much solely as demonstrations.
They never caught on, mainly because the additional weight of the batteries made cornering horrible. That said, batteries on cars are likely to make up proportionally less of the mass of the vehicle. Now that electric / hybrids are common on the roads it makes sense to go racing them.
Don't hold your breath for a Formula 1 e-car though. You'll get Jeremy Clarkson standing as a Communist MP before you convert petrolheads to lithium-ion. For a start, they just don't make a very exciting noise...