$VIserver = "vcserver"
 Connect-VIServer $VIserver  
 
 $VMarray = Get-VM 
 
 foreach ($item in $VMarray) 
 {
   if ($Item.Powerstate -eq  "Poweredon") 
   {
     "Server " + $Item.Name +  " is powered on"
     "Shutting down" + $Item.Name 
     Get-VM $Item.Name | Shutdown-VMGuest -Confirm
 
   } 
 
 }