In 2011, the tariff of last resort was modified on 1 January, 1 April, 1 July and 1 October.
Over the course of 2011, the TUR 1 fixed term increased to 4.9%; the TUR 2 was 6.3%. The variable terms (the price of natural gas) increased by 17.2% and 18.5% respectively.
Remember that the majority of gas supplied to Spain is based on contracts in which the price of crude and petrol products is a very significant reference. Thus, the Cmp (cost of natural gas) increased by 29% in 2011, which is very much above the increases in TUR 1 and TUR 2.