Spanish consumer prices rose 6.5% year-on-year in December, revised slightly from an initial 6.7% flash estimate, but accelerating the upward trend to hit the fastest inflation rate since May 1992, the data showed.

Prices of housing and utilities jumped 23.3% year-on-year, mainly driven by soaring electricity prices, the INE said in its more detailed second reading. Electricity prices had risen 72% from a year ago.

Despite the broad-based rise, December transport costs fell 10.9% from November, pulled down by a drop in fuel prices.

Core inflation, which strips out volatile food and energy prices, was 2.1% year on year, up from 1.7% a month earlier, the National Statistics Institute data showed.

European Central Bank Vice President Luis de Guindos said on Thursday that a spike in euro zone inflation was not proving as transitory as earlier thought and that price growth this year was at risk of exceeding projections.

Inflation is likely to drop below the bank's 2% target in 2023 and 2024, he said.

(Reporting by Aida Pelaez-Fernandez and Nathan Allen; Editing by Belén Carreño and Tomasz Janowski)