Switching off lights at night in metro stations in Brussels (STIB)

Because energy costs were fairly low in the 1980s, lighting in the Brussels metro stations was not switched off at night. The KYOLIGHT project involves switching off partially the operational lighting of metro stations by linking the lighting off switch to the automatic closing of the security gates between 01.00 and 04.00.

Linking this interface with the automatic doors required no specific equipment; only close cooperation between maintenance and security services within the company. The project highlighted that some lighting equipment was defective and/or not correctly wired to the main power circuit. The resulting energy savings represent some 9% of the energy consumption of the metro stations (1.56 GWh) with cost savings of €125,000 per year.
Technical data

Investment costs (€)


Staff resources (days)

2 days

Energy savings (%)


Annual energy savings (kWh)

1,560,000 kWh (for all stations)

Annual CO2 savings (TCO2)

246 TCO2

Annual cost savings (€)


Payback time (years)

Less than one year