I scanned this thread pretty closely for someone else to ask you where you got this information from. I did not see it, so... where did you get this information from?
If it is complete guesswork based on residential per-kWh costs... sigh.
The number is from township briefing that discussed SC installation and stall vs parking allocation. At the moment I don't remember which town
EDIT: I cannot find the document... Anyway, at 20c per kwh, 80kwh per stall, 8 stalls utilized 5% of the time would cost $56,064 in electricity per year.