This is for Octopus Energy US referral, you can get $50 credit once sign up. https://octopusenergy.com/friend-referral/brazen-abacus-131/
FYI, for some reason, I got an error message ("code invalid") when I opened such links more than once, and clearing cache didn't help. The only thing that helped is opening for the first time on another device (phone or laptop) and signing up right away.
United States USA
Source: Commercial_Ad236