Can Power BI be used on the Customer Portal to give the Customer a look at certain data? Example - they are billed on usage of a certain product (think: Electricity), and they want to track their usage. Can we use Power BI to compile this data onto their Customer Login Portal?

Interesting use case .. hit up @Josh_SatoriReporting. He's a Netsuite -> PowerBI guru

I have someone that does the PowerBI, I just need to know if it's possible or not so I can recommend it to a Client looking for advanced reporting to customers

Yes - 100% possible and many of our customers do exactly that.

thank you for confirming Josh!