SQL Job to run powershell modifying excel

Hello Forum Readers,

I am in a bit of unchartered waters when it comes to what I am looking to accomplish. I have an excel chart that needs to be updated through powershell. The script runs fine when launched personally, now I want to create a SQL job to execute it on a schedule. The catch is Office is not installed on the server. Any one know of a work around? here is what I am doing:

$objectExcel = new-object -comobject excel.application
$objectExcel.displayAlerts = $false 
$Classes = $objectExcel.workbooks.open("T:\Shared Information\WorkingLinkedFiles\ExeChart_Linked_Sb1.xlsm", $null, $true)
$objectExcel.run("UpdateChart")
$Classes.close($false)
$objectExcel.quit()
spps -n excel
any suggestions are appreciated.
RP