New article here:
http://www.elpais.com/articulo/portada/tarifa/electrica/sube/media/plena/crisis/elpepipor/20080605elpepieco_2/Tes/

Looks like the increase will be between 5 and 6%, gas is coming down in price by 2.4% from next month, low electricity consumers and people with a 3Kw or lower tariff will save up to 10%, large consumers will pay more per Kw (your tariff is printed on your bill if you want to check it).

A few other changes are detailed in the article.

Nigel