When the VPSC came into force, the quarterly auctions used until that point for establishing the price of energy disappeared. From then on, the price of electricity has been calculated by the Red Eléctrica Española (REE) on a daily basis according to the market’s hourly prices for energy.
With this system, the prices of electricity can change every hour according to the progress of the electricity market. In other words, the sum of your bills depends on factors such as climate or energy demands.
The change to VPSC took place automatically on 1 July 2014, so, if you had the LRT and you did not change anything, you will now have the VPSC tariff. (Royal Decree 216/2014 of 28 March).