Not enough power on our electricity supply ALBATERA

Hmm, have you tried Iberdrola? Most modern houses need 5.75Kw and Iberdrola will require a boletin (certificate) from a qualified electrician to say your wiring can handle the extra. I had it done in our flat which had 3.3Kw and upped it to 5.75kw which is what I have in my house now and never have a problem with tripping and this is in a 3 bed, 2 bathroom property running 

Iberdrola gave me a list of electricians and one came out a couple of days later, told me the plug sockets the builder had installed were rubbish but the wiring was fine. Cost about 150 euro for inspection and boletin but was upgraded to 5.75Kw within the week. 

The list of electricians included many of the Brits electricians who work around this area. 

You can calculate how much power you need and contact Iberdrola from this site. Iberdrola

We are with the Cooperativa in Albatera 

Cooperativa Eléctrica Benéfica Albaterense - Google Maps

They will send someone to check your electrics to see if they are capable of running on a higher potencia and will increase if ok to do so.
I don't know how long it will take but we are also running on just 3.4 and survive quite happily because increasing means a higher standing charge and higher usage charges.
That said, we have a bottled gas central heating system on a combi boiler so we don't use electric to heat water. We also only have one air con unit in the bedroom which goes on and off all night in the hottest weather., the rest of the rooms have ceiling fans although we do have 2 portable air con units for when we have guests.
We do all our clothes washing at the weekend or overnight on low rates. We have a swimming pool pump which runs at night, a huge chest freezer and an American side by side fridge freezer. We rarely use the tumble dryer but if we do, we do it when the washing machine is not running, or another big user like the oven.
We've been here 7 years and after the first week we've never tripped out and it really doesn't take a lot of getting used to once you realise what combinations can and can't be used together.
We also have smoke alarms as we run appliances at night.
If you are heating water by electric (especially if it is an old heater caked with limescale) and running several air con units to cool or heat at the same time then you may well need to increase but it might be worth asking if you can do it in stages.

Marcliff’s reply is correct but you may not need to get the electrician. It could be that the previous owners have reduced in incoming amount of power to reduce the standard charges. This is what had happened when I purchased my house. It had been empty for a while due to the previous owner having to return to the UK. Whilst they were away and putting it up for sale they reduced the incoming supply to 1KW (the minimum I believe) to reduce there costs. I went to the Iberdrola desk in a carrefour store and they increased it again no problem within 2 days.  It cost 76euro and an increase in my monthly standing charge. I didn't need to show any boletin (certificate) from an approved electrician as they could see on the system that it was originally higher. I increased it to 4KW and haven't had any issues since. You just need to work out what amount works for you depending on the amount of appliances you would potentialaly run at 1 time.

Worth checking out first. 

Thank you for your informative answer. Excuse my ignorance, but is the Cooperativa an electric supplier to Albatera? If so, could we move over to them, and have them up the ante on our supply? We have installed solar panels, which hopefully should bring the bills down anyway.  .

Yes, click on the link to show where they are, there is parking on rough ground opposite. They don't speak English but are happy to use phones to translate but I would hang on, if you have solar that should go a long way to solving your problem. I don't know much about solar but if you have the batteries and you still keep tripping out is there something else wrong?