I suppose I might have an expert opinion in this area, since I've been driving a high speed EV as my primary vehicle for 5+ years, as well as service them.
http://www.evbones.com
Granted, these are GM factory built EV's, and the VIN is recognized in the national insurance database as an electric propulsion system vehicle.
With fifty plus of these EV's now in service, each owner has their own carrier preference, and no problems. The known insurers are: State Farm, Allstate, Progressive, AAA, and AmFam.
I have AAA. The comp policy is full coverage with a non-depreciating full loss rider (separately declared) for $25k. Premiums total for this vehicle are slightly under $500 per year.
I formerly used American Family Insurance. Same declarations totaled to approximately $900 per year with them.
Our spare high speed EV is a conversion vehicle. Aside from requiring an annual state safety inspection, it is covered with the same comp declarations at a $65k non-depreciating loss. Premiums for this spare EV are slightly under $1100 per year.
Weighting factors:
Home and auto with same insurer. No accidents, DUI's, tickets, or claims inside of fifteen years.
Hair grows from my ears, so the demographics have me as a mature driver.
Hope that answers your question about insurance.
Regards, Jeff