Having had some seriously high bills from Iberdrola recently, I wrote to Endesa with all the details of our last bill for 190 euros.
I asked them to tell me what their charges would have been both for a standard contract and for a dual rate meter, assuming the total consumption were split 50/50 between the 2 rates, based on these figures.
Having read some comments on this site about the One rate, I expressed concern about being locked into the One Luz rate.

This was their reply:

We are contacting you to let you know that after having assessed your case on changing your electricity's company, we inform you about the final price you will get by contracting on One Rate. Please note that One Rate has the same prices forever, and the discount is applied forever, not only for the first year.
You will find all the terms and conditions for that offer at https://www.endesaclientes.com/stati...one-luz-en.pdf.

& the prices they quoted were:

Standard meter - TOTAL INVOICE AMOUNT 183,11€

Dual meter - TOTAL INVOICE AMOUNT 159,28€

Does anybody have any good information to offer that should persuade me NOT to change from Iberdrola ?
I would really appreciate all your help.

For such a small saving surely it's "better the devil you know"!

If you are on the usual domestic tariffs (ie potencia less than 10kw) the prices are all government controlled and they are in all cases less than they would charge if they weren't controlled.

As a result, they all charge the same price, but they just play around with the balance between the monthly charge and the unit charge and in the case of a dual tariff, they mess around with the two unit rates.

They offer discounts (usually just after they have increased the prices) and clearly they want to get people to change over to them. In subsequent years just watch the bills go up!

Having looked at all the tariffs on both sites, although they are marginally different, the overall cost will be much the same.

Where you will save a lot is if you go for a day/night tariff. As the cheap rate lasts for 14 hours it's pretty difficult not to save money. With a bit of planning you should find that your off peak usage is anything up to 70% of the total.

Incidentally, I used to be with Endesa and changed to Iberdrola. I am on the "free market" tariff as my potencia is over 10kw so there is a lot of competition there. Endesa were probably the worst company I have dealt with in Spain - their customer service was appalling - far worse than Telefonica.

Thank you Fred.
However, we haven't found Iberdrola quite so amenable.
Perhaps their response varies by area.

This makes for an interesting perspective:
http://www.endesa.com/EN/SALADEPRENS...an-2014-report

Their Ombudsman seems to be very successful - mainly on behalf of the customers.
Iberdrola don't have one !

Companies that give decent service don't need a built in Ombudsman!

To me, it implies that their service is bad, not good.

Whilst I agree, our experience with Iberdrola hasn't been without its problems - and they just adopt bully-boy tactics - with no fear of effective contradiction.
What I am not quite clear about is if we were to switch to Endesa, would our supply still be provided by the same distribution company as now - which is Iberdrola - and merely billed by Endesa ?

Fred can you explain the day/night tariff or post a link, please. Many thanks...

Yes, no change to that. Endesa merely takes over the billing.

As for bully boy tactics., Endesa wrote the manual.

It's quite simple really. The day is divided into two periods. One is 14 hours between 10pm and 12 noon. In winter this changes to 11pm to 1pm - that way they don't need to change the meter settings.

The peak rate is higher than the single rate and the off peak rate is lower. Endesa currently charges 15% more for the peak rate and 45% less for the off peak rate. The monthly charge is the same.

If you assume a constant usage pattern, it is impossible not to save money. If you take the trouble to run major appliance during the cheap rate you can save even more. The pool pump can be run during the cheap rate. Washing machines and dishwashers often have a delayed start facility. Electric water heaters can be put on a timer that only works during the cheap rate.

Frankly, I cannot think of any reason not to be on the dual tariff.

100% agree with that said Fred. Both previous posts.