My 1 bedroom apartment in Madrid is "fully electrical" that is heating/air conditioning (advisable in summer) hot water, and kitchen are electrical. Nevetheless this is not the normal situation for apartments here, most of then in Madrid would have water and rooms heated with propane or fuel, so you can consider my quotation as a kind of "maximum" expense in electricity for a 1 person apartment. I am spending from 30.000ptas/2months in winter to 12.000ptas/2months in may/june.