Guys I really appreciate the responses to what I hope never happens to any of us.  I have spent almost all of my "bitcoin life" for the past ten years on a laptop.  In the past year I upgraded to a high end desktop but it doesn't have a battery like my laptops did.  I was picturing clicking SEND on a Trezor, after reviewing the transaction, addresses, etc.... are all good to go  ---- BUT then at that instant the power goes dark!

I only use HD wallets or T Suite for BTC movements.  Mainly Electrum with my Trezors.  As I suspected it appears even in that instance that I would eventually be whole, if not instantly upon power return.  I don't know what makes me think of such things, but in reality it could happen!!  Thanks for the consideration of my question!!