Forum Discussion
Power BI premium
I would first find out what the security concerns of the organizations are. Power BI is a very secure environment and I have personally worked with several government organizations that have hosted their data in Power BI. Take a look at Power BI Added to Microsoft Trust Center. Also, check out this white paper - Managing compliance in the cloud
I am not sure what you mean by Power BI Enterprise, but if you are referring to Power BI Report Server, yes it requires either Power BI Premium or SQL Server Enterprise Edition with Software Assurance - both can be expensive depending on how you look at it. See if your client has a SQL Server Enterprise Edition license with Software Assurance, this would allow them to have Power BI Report Server on-prem without much additional cost.
I still think your best bet is to understand the security concerns and try to address them.