It doesnt look like we have a "Quick Report" that only shows VMs in certain power states but, to get this data, you have a couple of options:
You can run the "Virtual Machines Stats" (Quick Reports > VMware VC) report and sort by "Guest State" so that the machines that are "notRunning" are towards the top
Create a "My Report" based off of the "Virtual Machines Stats" report and add a filter to only show VMs with a Guest State of "notRunning" (AND 'Guest State' LIKE 'notRunning'). When you run that, the only results displayed should be VMs that are not running.
Hope that helps.
Works like a charm. Thanks