Use the torch on my phone.
Find the power banks
Order some grog from the nearest off license that delivers
Turn on battery operated lights
Find fleece blanket
Sit on sofa
Get mildly pissed.
Seriously though, I would wait to hear if the power cut is for hours or days and work around it accordingly. I have a wind up torch/radio, plenty of water in bottles in the shed, and tinned food +crackers that will ensure I don't starve.
I've been through a few of these already. As long as I can see my way around the house, I'll cope.