Ahhh!
Got it! Each VM in the list has trailing spaces galore.
I trimmed the text file and this works:
$VMFile = "C:\Users\blahblahblah\Documents\VM.txt"
$VM = Get-Content $VMFile
foreach ($singlevm in $VM){Get-VM -Name $singlevm | where-object {$_.PowerState -eq "poweredON" }}
/Peter
