It's obviously in the legitimate interests of the supplier and the grid to process your data in this way. They don't need your consent.I just got a text message from Powergrid to tell me they are working hard to restore my power supplies, Our power has not been off but I know it's still down in a few areas close to me, what I am wondering is how did they get my number? I've never called them and with GDPR I wouldn't think my electricity supplier would give them my number, it's a text message and does not allow replies, I can't even see the number that sent the message.
No links to any dodgy sites just "see our Twitter and Facebook pages or in an emergency call 105"