I’ve had the question if its possible to show a PowerPivot workbook using a Excel web access webpart. The answer: Of course it is, the workbook is a regular excel workbook, so you can just point from the Excel web access webpart to a PowerPivot workbook from the powerpivot gallery. Users can interact with the PowerPivot workbook instantly as they would in a report:
The excel web part isn’t available at the PowerPivot site collection. I have created a BI site collection and added a PowerPivot Library to it. In the BI site collection we can use the excel web access webpart.