For transitional tariffs for sales to end customers, for those "who remain in the regulated market (which represent 6.3% of total consumption and 936 thousand customers, corresponding to the end of October 2023), or who, being in the market free, have opted for a similar rate", the variation between December 2023 and January 2024 reaches 3.7%.

With regard to the average annual variation in transitional tariffs for sales to end customers in Low Normal Voltage (BTN), this is 2.9%, and "these increases are in line with the inflation forecast for 2024, which represents a zero variation in real terms".

ERSE presented a simulation to illustrate the impact of the average increase of 3.7% in the regulated market, between December 2023 and January 2024, on the most significant type of customers.

A couple without children with a power of 3.45 kVA and consumption of 1,900 kWh/year will pay 1.05 euros more in January compared to December.

For a couple with two children (power 6.9 kVA, consumption 5000 kWh/year) the increase will be 3.27 euros.