Not very easy to discern which Excel version includes the product, and how we'd acquire it if our version did not.
There's this, but we use Office 2013 and it appears I need to acquire a license to use.
Digging here shows we may have to upgrade Office versions. Not going to happen.
I was excited when I read this story but the cold water is pouring in.
PowerPivot for Excel is available for free for Excel 2010 and later, that is the same analytical engine as in PowerBI.
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You can use PoverBI Desktop and Excel as a data source if nothing else works for you.