Third source substation


The construction of the first Sainte-Dévote source sub-station goes back to May 1980. It was completed in July 1983.

The sub-station is built into one of the walls of the Vallon de Sainte-Dévote, below Boulevard Rainier III. 
Built to have a power of 72,000 KVA, it includes:

  •  2 36,000 KVA transformers (63,000V / 21,000 V / 11,000 V)
  •  1 36,000 KVA transformer (63,000V / 21,000 V).

The supply is provided through two 800 mm², 63,000 V dry cables from EDF’s Bordina sub-station in Beausoleil.

A 1,200 mm2, 63,000 V dry cable ensures back-up to the SMEG sub-station in Fontvieille.

In the 1990s, SMEG began a huge electrical equipment project, which led to the creation of a new source sub-station in the Fontvieille district in 1992.

This 63/20 kV transformer sub-station is connected to the Sainte-Dévote sub-station so that it can act as a bridge in the event of an outage.

In 1993, a telecontrol centre made it possible to operate the Fontvieille source sub-station from SMEG’s premises.

A year later, the same centre also made operation of the Sainte-Dévote sub-station possible.

In 2006, it was decided to build a third source sub-station in Monaco. The work began in 2012.

5 years later, the third sub-station became operational.

It was inaugurated on 27 November 2017 by H.S.H. Prince Albert II.


H.S.H. Prince Albert II and Thomas Battaglione, Chief Executive Officer of SMEG

H.S.H. Prince Albert II and Thomas Battaglione, Chief Executive Officer of SMEG

The major stages of a massive construction site

The leveling and civil engineering works required over 90 workers during the busiest period.

More than 330 blastings were needed to remove the rock and create the 2,100 m² of the sub-station, which also uses the 700 m² of the old SNCF tunnel that was abandoned when the underground Monaco station was built.

The works also involved constructing a 300 m² bridge with two arches to extend the existing viaduct and enable access to the sub-station.



Key numbers

  • 5 years of work
  • 2,800 m² of total surface area
  • 63,000 volts from France
  • 37,000 m3 of rock removed
  • 130 metres in length