Power Bi price

Hi All,

I don't understand the prices of power bi service.
The page https://powerbi.microsoft.com/en-us/pricing/ says:

Global limit for tenant = 10 GB x # of Power BI Pro seats purchased
Limit for a single personal workspace = 10 GB
Limit for a single group = 10 GB

I have a datawarehouse of 500GB and I would like to use a on-premises configuration. How much is it ? I should buy 50 licenses?

Thanks in advance,