Power cut - apps not working

I had a power cut before Christmas. it was short lived and everything was Ok within the day. What I neglected to do was look at my apps: Onecta and GivEnergy; both are unconnected (my heat pump and solar are both working fine and the central heating and hot water) I've tried to reconnect to GivEnergy but it refuses to recognise my login details. I've emailed them but had no reply. Also, I've noticed that my home wifi used to have a separate name which I would be connected to for my appliances, this seems to have disappeared.
Any help, would be...very much appreciated.

Is your router alive, or dead?
Was it fried in some sort of power surge?
Can you connect to your router and see it is online?
Has your ISP pushed out some sort of router upgrade that has increased the security level and your appliances can no longer connect? GivEnergy dongle can only support WPA2
Has your router crashed and reset itself losing your "separate ssid name"?

I think you need to get your router and SSIDs back on line and then reconnect your appliances?