It costs $5-$10 for the electricity to charge a car using level 2 charging. It is a trivial "perk" for an employee that costs an order of magnitude more per hour of work.
Not trivial if they a bunch of chargers. I work for the state in California and we have chargers at work but are charged for them around $.29/kWh which is cheaper than Tesla I think.
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Never mind that, the cost of an urban parking space is considerable.
Here's a £50k London parking space: https://www.rightmove.co.uk/properties/136662200#/?channel=R...
While that's an extreme, I would expect the cost of any urban parking space with a low speed charger to be dominated by the land, then the charger one-off install price, and thereafter electricity use is a pretty trivial cost.
Sydney will also charge you 3,000 $AUS annually for central parking spaces: https://www.revenue.nsw.gov.au/taxes-duties-levies-royalties...