When joining Octopus Energy, you might come across both coupons and referral codes. Which one you use can depend on the offer details and your personal circumstances. Referral codes often provide a shared benefit—both you and the person who referred you receive a credit. Coupons, on the other hand, might be one-off discounts or promotions. In terms of potential savings, referral credits can add up if you continue sharing them. Coupons usually grant a set amount, so it’s wise to compare the offers. Ultimately, the choice comes down to availability and your preference. Either way, leveraging these deals can significantly reduce your energy bills while going green.