I don't have market pricing here in Spain, I have fixed per kWh pricing only. I prefer this because I hate the min-maxing and figuring out cheap hours etc. I just want to use my energy when it suits my life, I don't want to rearrange my life around it. But the people that are totally into that love it because it allows them to save cost. I really don't care.
I think you have to get market pricing if you have solar panels but most people don't bother especially because that market pricing makes them totally cost-ineffective. Also, I live in an apartment anyway where I can't even have them if I wanted to.
See this: https://www.endesa.com/en/catalog/light/one/one-luz (the "Energy Term" is the kWh price - pre tax but the tax has just been dropped to 10%, so it's even less than 14 cents now!)
I think you have to get market pricing if you have solar panels but most people don't bother especially because that market pricing makes them totally cost-ineffective. Also, I live in an apartment anyway where I can't even have them if I wanted to.