Can I always pay the same price even on the Tarifa Transparente?

Yes, thanks to the Price Guardian. If you're on the Tarifa Transparente and want to lock in a fixed price for a specific month, you can activate the Price Guardian during the first 7 days of that month.

For that billing cycle, your energy will be charged at the locked price instead of the variable market rate. If you'd prefer a permanently fixed price with no monthly management, the Constant Tariff may be the better fit.