Increasing potencia with Endesa

I received a letter from Endesa that my potencia is low and that I should consider increasing it. When I bought my house 5 years ago the potencia was 1,5 and I never saw any reason to change it until this letter which makes it sound like i will have to start resetting the breaker every time I try to do anything.
Does anyone have any recent experience with increasing the potencia? Do I need to get an electrician to give me a new certificate (CIE) before even beginning the process with Endesa?
Any advice would be appreciated!

Any contract change requires a new certificate, and updating of any circuits/wiring if required to meet current standards.